# file      : tests/pkg-build.testscript
# license   : MIT; see accompanying LICENSE file

.include common.testscript \
         config.testscript \
         remote.testscript \
         remote-git.testscript

# Source repository:
#
# pkg-build
# |-- libbar-1.0.0.tar.gz -> libfoo
# |-- libbaz-1.1.0.tar.gz -> libfoo, libbar
# |-- libfix-0.0.1.tar.gz
# |-- libfoo-0.0.1.tar.gz -> libfix
# |-- libfoo-1.0.0.tar.gz
# |
# |-- libfoo-1.1.0
# |   |-- build
# |   |   `-- bootstrap.build
# |   |-- buildfile
# |   `-- manifest
# |
# |-- libhello-1.0.0
# |   |-- build
# |   |   |-- bootstrap.build
# |   |   |-- export.build
# |   |   `-- root.build
# |   `-- *
# |
# |-- libfoo-1.1.0.tar.gz
# |-- libfoo-1.2.0.tar.gz
# |
# |-- t0a
# |   |-- libbar-0.0.1.tar.gz   -> libbaz == 0.0.1
# |   |-- libbaz-0.0.1.tar.gz   -> libfox
# |   |-- libbaz-0.0.3.tar.gz   -> libfoo
# |   |-- libbox-0.0.1.tar.gz   -> libbaz
# |   |-- libfix-0.0.1.tar.gz
# |   |-- libfoo-0.0.1.tar.gz   -> libfix
# |   |-- libfox-0.0.1.tar.gz
# |   `-- repositories.manifest
# |
# |-- t0b
# |   |-- libbar-0.0.2.tar.gz   -> libbaz <= 0.0.2
# |   |-- libbaz-0.0.2.tar.gz   -> libfoo
# |   |-- libbiz-0.0.2.tar.gz   -> libbaz <= 0.0.3
# |   |-- libfoo-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t0c
# |   |-- libbar-0.0.3.tar.gz   -> libbaz
# |   |-- libbar-1.0.0.tar.gz   -> libfoo
# |   |-- libbaz-0.0.3.tar.gz   -> libfoo
# |   |-- libbaz-0.0.4.tar.gz
# |   |-- libbaz-0.1.0.tar.gz
# |   |-- libbox-0.0.1.tar.gz   -> libbaz
# |   |-- libfix-0.0.3.tar.gz   -> libbaz >= 0.0.3
# |   |-- libfoo-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t0d
# |   |-- libbiz-0.0.1.tar.gz   -> libbox, libfox
# |   |-- libbox-0.0.2.tar.gz   -> libfoo == 1.0.0
# |   |-- libfix-0.0.1.tar.gz
# |   |-- libfox-0.0.2.tar.gz   -> libfoo == 0.0.1
# |   |-- libfoo-0.0.1.tar.gz   -> libfix
# |   |-- libfoo-1.0.0.tar.gz
# |   |-- libfox-0.0.1.tar.gz
# |   `-- repositories.manifest
# |
# |-- t1
# |   |-- libfoo-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t2
# |   |-- libbar-1.0.0.tar.gz   -> libfoo
# |   |-- libfoo-0.1.0.tar.gz
# |   |-- libfoo-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t3                        -> t2 (prerequisite repository)
# |   |-- libbaz-1.0.0.tar.gz   -> libbar
# |   |-- libfox-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4a
# |   |-- libfoo-1.1.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4b                       -> t4a (prerequisite repository)
# |   |-- libbar-1.1.0.tar.gz   -> libfoo == 1.1.0
# |   `-- repositories.manifest
# |
# |-- t4c                       -> t4b (prerequisite repository)
# |   |-- libbaz-1.1.0.tar.gz   -> libfoo, libbar
# |   |-- libfoo-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4d                       -> t4c (complement repository)
# |   |-- libbiz-1.0.0.tar.gz   -> libfox, libfoo, libbaz
# |   |-- libfox-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4e                       -> t4a (complement repository)
# |   |-- libfoo-1.1.0+1.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4f
# |   |-- libfoo-2.0.0.tar.gz   -> libbar == 1.2.0
# |   |-- libbar-1.2.0.tar.gz
# |   |-- libbar-2.1.0.tar.gz   -> libbox
# |   |-- libbox-1.0.0.tar.gz   -> libbax
# |   |-- libbox-2.0.0.tar.gz   -> libbax == 1.0.0
# |   |-- libbax-1.0.0.tar.gz
# |   |-- libbax-2.0.0.tar.gz
# |   |-- libbix-1.0.0.tar.gz   -> libbax == 1.0.0
# |   |-- libbix-2.0.0.tar.gz   -> libbax == 2.0.0
# |   |-- libbux-1.0.0.tar.gz   -> libbix
# |   |-- libfix-1.0.0.tar.gz   -> libfox
# |   |-- libfox-1.1.0.tar.gz   -> libbar >= 1.0.0
# |   |-- libfox-2.0.0.tar.gz   -> libbar >= 2.0.0
# |   `-- repositories.manifest
# |
# |-- t4i
# |   |-- libbaz-2.0.0.tar.gz   -> libbar < 2.1.0
# |   |-- libbar-0.1.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4j
# |   |-- libbar-0.1.0.tar.gz
# |   |-- libbar-1.2.0.tar.gz
# |   |-- libfoo-3.0.0.tar.gz   -> libbar
# |   |-- libfox-0.0.1.tar.gz
# |   |-- libfox-2.1.0.tar.gz   -> libbar, libbaz == 1.2.0
# |   |-- libfox-3.0.0.tar.gz   -> libbar == 0.1.0, libbaz == 1.2.0
# |   |-- libbaz-1.2.0.tar.gz   -> libbar == 1.2.0
# |   |-- libbaz-2.1.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t4k
# |   |-- libbar-1.0.0.tar.gz   -> libfoo == 1.0.0
# |   |-- libbaz-1.0.0.tar.gz   -> libfox
# |   |-- libfoo-1.0.0.tar.gz   -> libfix == 1.0.0
# |   |-- libfoo-2.0.0.tar.gz   -> libfix == 2.0.0
# |   |-- libfox-1.0.0.tar.gz   -> libfux == 1.0.0
# |   |-- libfox-1.2.0.tar.gz   -> libfux == 1.0.0, libfex >= 2.0.0
# |   |-- libfox-2.0.0.tar.gz   -> libfux == 2.0.0
# |   |-- libfix-1.0.0.tar.gz   -> libfax == 1.0.0
# |   |-- libfix-2.0.0.tar.gz   -> libfax == 2.0.0
# |   |-- libfux-1.0.0.tar.gz   -> libfaz == 1.0.0, libfex == 1.0.0
# |   |-- libfux-2.0.0.tar.gz   -> libfaz == 2.0.0, libfex == 2.0.0
# |   |-- libfex-1.0.0.tar.gz   -> libfaz == 1.0.0
# |   |-- libfex-2.0.0.tar.gz   -> libfaz == 2.0.0
# |   |-- libfax-1.0.0.tar.gz   -> libfuz == 1.0.0
# |   |-- libfax-2.0.0.tar.gz   -> libfuz == 2.0.0
# |   |-- libfaz-1.0.0.tar.gz   -> libfuz == 1.0.0
# |   |-- libfaz-2.0.0.tar.gz   -> libfuz == 2.0.0
# |   |-- libfuz-1.0.0.tar.gz
# |   |-- libfuz-2.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t5
# |   |-- libbar-1.2.0.tar.gz
# |   |-- libbox-1.2.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t6
# |   |-- libBar-2.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t7a
# |   |-- libbaz-1.0.0.tar.gz
# |   |-- libbuild2-bar-1.0.0.tar.gz
# |   |-- foo-1.0.0.tar.gz            -> * libbuild2-bar ^1.0.0, libbaz ^1.0.0
# |   |-- libbuild2-foo-1.0.0.tar.gz  -> libbaz ^1.0.0
# |   |-- libbiz-1.0.0.tar.gz         -> * libbuild2-foo ^1.0.0, * foo ^1.0.0,
# |   |                                  libbaz ^1.0.0
# |   |-- libbuz-1.0.0.tar.gz         -> * libbuild2-foo ^1.0.0, * foo ^1.0.0
# |   |-- libbix-1.0.0.tar.gz         -> libbiz ^1.0.0, libbuz ^1.0.0
# |   |-- libbar-1.0.0.tar.gz         -> * foo ^1.0.0, libbaz ^1.0.0
# |   |-- libbox-1.0.0.tar.gz         -> * foo ^1.0.0, libbaz ^1.0.0
# |   |-- libfax-1.0.0.tar.gz
# |   |-- libfix-1.0.0.tar.gz         -> libbar ^1.0.0, libbox ^1.0.0,
# |   |                                  libfax ^1.0.0
# |   `-- repositories.manifest
# |
# |-- t7b                       -> t7a (complement repository)
# |   |-- libbaz-1.1.0.tar.gz
# |   |-- foo-1.1.0.tar.gz      -> libbaz ^1.1.0
# |   |-- libbar-1.1.0.tar.gz   -> * foo ^1.1.0, libbaz ^1.0.0
# |   |-- libbox-1.1.0.tar.gz   -> * foo ^1.0.0
# |   `-- repositories.manifest
# |
# |-- t8a
# |   |-- libbar-1.0.0.tar.gz
# |   |-- libbaz-1.0.0.tar.gz
# |   |-- libbaz-1.1.0.tar.gz
# |   |-- libbiz-0.1.0.tar.gz
# |   |-- libbiz-1.0.0.tar.gz
# |   |-- libbox-0.1.0.tar.gz
# |   |-- libbox-0.1.1.tar.gz
# |   |-- libbox-1.0.0.tar.gz
# |   |-- libfoo-1.0.0.tar.gz
# |   |-- libfoo-2.0.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> libbar
# |   |-- baz-1.0.0.tar.gz      -> libbaz
# |   |-- bax-0.1.0.tar.gz      -> libbox config.bax.backend=libbox
# |   |-- bax-1.0.0.tar.gz      -> libbox >= 0.1.1 config.bax.backend=libbox
# |   |-- bix-0.1.0.tar.gz
# |   |-- bix-1.0.0.tar.gz      -> bax == 0.1.0
# |   |-- box-1.0.0.tar.gz      -> libbiz ^1.0.0 config.box.backend=libbiz |
# |   |                            libbox >= 0.1.1 config.box.backend=libbox,
# |   |                            libbaz
# |   |-- bux-1.0.0.tar.gz      -> bix
# |   |-- dax-1.0.0.tar.gz      -> libbar ? ($config.dax.extras)
# |   |                            libbaz
# |   |-- dix-0.1.0.tar.gz
# |   |-- dix-1.0.0.tar.gz      -> dax require {config.dax.extras=true}
# |   |-- dox-1.0.0.tar.gz      -> dax
# |   |-- dux-1.0.0.tar.gz      -> dix
# |   |-- fax-1.0.0.tar.gz      -> libbar ^1.0.0 ? ($cxx.target.class == 'windows') config.fax.backend=libbar |
# |   |                            libbaz ^1.0.0 ? ($cxx.target.class != 'windows') config.fax.backend=libbaz,
# |   |                            libbiz ? ($config.fax.libbiz) config.fax.extras='[b\i$z]',
# |   |                            libbox ? ($config.fax.libbox && $config.fax.backend == libbaz && $config.fax.extras == '[b\i$z]')
# |   |-- fix-1.0.0.tar.gz      -> libbaz ^1.0.0 | libbar ^1.0.0
# |   |-- foo-1.0.0.tar.gz      -> {libbar libbaz} ^1.0.0
# |   |-- fox-1.0.0.tar.gz      -> libbar ^1.0.0 | libbaz ^1.0.0
# |   |-- fux-1.0.0.tar.gz      -> libbiz ? (!$config.fux.libbiz_old) | libbiz ^0.1.0 ? ($config.fux.libbiz_old)
# |   |-- fuz-1.0.0.tar.gz      -> libfoo
# |   |-- foz-1.0.0.tar.gz      -> fuz
# |   |-- tax-1.0.0.tar.gz      -> libfoo == 1.0.0 | libfoo == 2.0.0
# |   |-- tex-1.0.0.tar.gz      -> libfoo prefer{} accept(true) reflect {...}
# |   |-- tix-1.0.0.tar.gz      -> libfoo >= 2.0.0 reflect {...} | libfoo >= 1.0.0 reflect {...}
# |   |-- tox-1.0.0.tar.gz      -> libfoo >= 2.0.0 prefer{} accept(true) reflect {...} | libfoo >= 1.0.0 reflect {...}
# |   |-- tpx-1.0.0.tar.gz      -> libfoo >= 2.0.0 prefer{...} accept(true) reflect {...} | libfoo >= 1.0.0 prefer{...} accept(true) reflect {...}
# |   |-- tux-1.0.0.tar.gz      -> libfoo prefer{config.libfoo.protocol = "1"} accept(true),
# |   |                            libbox ? (config.libfoo.protocol == "1")
# |   |-- twx-1.0.0.tar.gz      -> libbiz,
# |   |                            libfoo prefer{config.libfoo.protocol = "1"} accept(true),
# |   |                            libbox ? (config.libfoo.protocol == "1")
# |   |-- tvx-1.0.0.tar.gz      -> libfoo >= 2.0.0 reflect {...} | libfoo >= 1.0.0 reflect {...},
# |   |                            libfox prefer{config.libfox.level = $config.tvx.reflect} accept(true)
# |   `-- repositories.manifest
# |
# |-- t9
# |   |-- libbar-1.0.0.tar.gz
# |   |-- libbaz-1.0.0.tar.gz   -> libbar ^1.0.0
# |   |-- libbox-1.0.0.tar.gz   -> libbar ^1.0.0
# |   |-- foo-1.0.0.tar.gz      -> libbaz, libbox
# |   `-- repositories.manifest
# |
# |-- t10
# |   |-- libfoo-bar-1.0.0.tar.gz   (tests) -> libfoo-tests
# |   |-- libfoo-baz-1.0.0.tar.gz   (tests) -> libfoo-tests
# |   |-- libfoo-tests-1.0.0.tar.gz
# |   |-- libbar-foo-1.0.0.tar.gz   (tests) -> libbar-tests
# |   |-- libbar-baz-1.0.0.tar.gz   (tests) -> libbar-tests
# |   |-- libbar-tests-1.0.0.tar.gz         -> ? libbar-foo, ? libbar-baz
# |   `-- repositories.manifest
# |
# | NOTE: remember to update
# |       pkg-build/dependency/config-negotiation-order/repo-packages/*
# |       tests if adding any packages to the below repository.
# |
# |-- t11a
# |   |-- libfoo-0.1.0.tar.gz
# |   |-- libfoo-1.0.0.tar.gz
# |   |-- libbar-0.1.0.tar.gz
# |   |-- libbar-1.0.0.tar.gz
# |   |-- libbaz-0.1.0.tar.gz
# |   |-- libbaz-1.0.0.tar.gz
# |   |-- libbox-0.1.0.tar.gz
# |   |-- libbox-1.0.0.tar.gz
# |   |-- libbiz-0.1.0.tar.gz
# |   |-- libbiz-1.0.0.tar.gz   -> libbar
# |   |-- foo-0.1.0.tar.gz      -> libfoo {require {config.libfoo.extras=true}}
# |   |-- foo-0.2.0.tar.gz      -> libfoo {require {config.libfoo.extras=true}} | libbar
# |   |-- foo-1.0.0.tar.gz      -> libfoo {require {config.libfoo.extras=true} reflect {...}}
# |   |-- fox-0.1.0.tar.gz      -> libfoo {prefer {config.libfoo.extras=true} accept (false)} |
# |   |                            libbar
# |   |-- fox-0.2.0.tar.gz      -> libfoo {prefer {config.libfoo.extras=false} accept (!$config.libfoo.extras)} |
# |   |                            libfoo {prefer {config.libfoo.extras=true}  accept (true)} |
# |   |                            libbar {require {config.libbar.extras=true}}
# |   |-- fox-1.0.0.tar.gz      -> libfoo {require {config.libfoo.extras=true}}
# |   |-- fux-0.1.0.tar.gz      -> libfoo ? ($config.fux.extras=true)
# |   |-- fux-0.1.1.tar.gz      -> libfoo ? ($config.fux.extras=true)
# |   |-- fux-0.2.0.tar.gz      -> libfoo {enable($config.fux.extras=true) require {config.libfoo.extras=true}}
# |   |-- fux-1.0.0.tar.gz      -> libfoo
# |   |-- fix-0.1.0.tar.gz      -> foo == 0.1.0
# |   |-- fix-1.0.0.tar.gz      -> foo {require {config.foo.extras=true}}
# |   |-- fex-0.1.0.tar.gz      -> fux {require {config.fux.extras=true}}
# |   |-- fex-1.0.0.tar.gz      -> foo, libfoo {require {config.libfoo.extras=true}}
# |   |-- bar-0.1.0.tar.gz      -> libbar == 0.1.0 {require {config.libbar.extras=true}}
# |   |-- bar-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}}
# |   |-- baz-0.1.0.tar.gz      -> {libbar libfoo} == 0.1.0 {require {config.libbar.extras=true config.libfoo.extras=true}}
# |   |-- baz-1.0.0.tar.gz      -> {libbar libfoo} {require {config.libbar.extras=true config.libfoo.extras=true}}
# |   |-- bac-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            libbaz {require {config.libbaz.extras=true}},
# |   |                            libfoo {require {config.libfoo.extras=true}}
# |   |-- bat-1.0.0.tar.gz      -> libbaz {require {config.libbaz.extras=true}}
# |   |-- bas-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            bus {require {config.bus.extras=true}}
# |   |-- bus-0.1.0.tar.gz      -> foo {require {config.foo.extras=true} reflect {...}}
# |   |-- bus-1.0.0.tar.gz      -> libaz {require {config.libbaz.extras=true}},
# |   |                            foo {require {config.foo.extras=true}}
# |   |-- box-0.1.0.tar.gz      -> libbox == 0.1.0 {require {config.libbox.extras=true}}
# |   |-- box-0.2.0.tar.gz      -> libbox {require {config.libbox.extras=true}}
# |   |-- box-1.0.0.tar.gz      -> {libbar libfoo} {require {config.libbar.extras=true config.libfoo.extras=true}} |
# |   |                            libbox
# |   |-- bax-0.1.0.tar.gz      -> {libbox libbar} {require {config.libbox.extras=true}}
# |   |-- bax-1.0.0.tar.gz      -> libfoo {require {config.libfoo.extras=true} reflect {...}},
# |   |                            {libbox libbar} {require {config.libbox.extras=true config.libbar.extras=true}}
# |   |-- bux-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}}
# |   |-- bix-1.0.0.tar.gz      -> {libbar bar} {require {config.libbar.extras=true config.bar.extras=true}},
# |   |                            bux
# |   |-- bex-1.0.0.tar.gz      -> libbar
# |   |-- boo-1.0.0.tar.gz      -> libbar | libfoo {require {config.libfoo.extras=true}} | libbox
# |   |-- biz-0.1.0.tar.gz      -> libbiz == 0.1.0
# |   |-- biz-1.0.0.tar.gz      -> boo {require {config.boo.extras=true}}
# |   |-- buz-1.0.0.tar.gz      -> bux {require {config.bux.extras=true}}
# |   |-- buc-1.0.0.tar.gz      -> libfoo {require {config.libfoo.extras=true}},
# |   |                            bux {require {config.bux.extras=true}}
# |   |-- tax-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            libfoo
# |   |-- tex-0.1.0.tar.gz      -> libfoo {require {config.libfoo.extras=true}}
# |   |-- tex-0.2.0.tar.gz      -> libbar,
# |   |                            libfoo {require {config.libfoo.extras=true}}
# |   |-- tex-0.3.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            libfoo {require {config.libfoo.extras=true}}
# |   |-- tex-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            libfoo {require {config.libfoo.extras=true} reflect {...}}
# |   |-- tix-0.1.0.tar.gz
# |   |-- tix-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            tex {require {config.tex.extras=true}}
# |   |-- tiz-1.0.0.tar.gz      -> tex {require {config.tex.extras=true}, reflect {...}},
# |   |                            libbar {require {config.libbar.extras=true}}
# |   |-- toz-0.1.0.tar.gz
# |   |-- toz-0.2.0.tar.gz      -> libfoo {require {config.libfoo.extras=true}},
# |   |                            libbar {require {config.libbar.extras=true}}
# |   |-- toz-1.0.0.tar.gz      -> libbaz {require {config.libbaz.extras=true}},
# |   |                            libfoo {require {config.libfoo.extras=true}},
# |   |                            libbar {require {config.libbar.extras=true}}
# |   |-- tez-0.1.0.tar.gz      -> libbox {require {config.libbox.extras=true}},
# |   |                            toz == 0.1.0 {require {config.toz.extras=true}}
# |   |-- tez-1.0.0.tar.gz      -> libbox {require {config.libbox.extras=true}},
# |   |                            toz == 0.1.0 {require {config.toz.extras=true}},
# |   |                            libbar {require {config.libbar.extras=true}}
# |   |-- tuz-1.0.0.tar.gz      -> toz {require {config.toz.extras=true}}
# |   |-- tux-1.0.0.tar.gz      -> libbox {require {config.libbox.extras=true}},
# |   |                            tix == 0.1.0
# |   |-- tvz-0.1.0.tar.gz      -> toz == 0.2.0 {require {config.toz.extras=true}},
# |   |                            bax,
# |   |                            libfoo {require {config.libfoo.network=true}}
# |   |-- tvz-1.0.0.tar.gz      -> toz == 0.2.0 {require {config.toz.extras=true}}
# |   |-- dex-1.0.0.tar.gz      -> bar {require {config.bar.extras=true}},
# |   |                            libfoo {require {config.libfoo.extras=true}}
# |   |-- dix-1.0.0.tar.gz      -> libbar {require {config.libbar.extras=true}},
# |   |                            libbox {require {config.libbox.extras=true}},
# |   |                            dox {require {config.dox.extras=true}}
# |   |-- diz-1.0.0.tar.gz      -> dox {require {config.dox.extras=true}},
# |   |                            libbox {require {config.libbox.extras=true}},
# |   |                            libbar {require {config.libbar.extras=true}}
# |   |-- dox-1.0.0.tar.gz      -> dex {require {config.dex.extras=true}}
# |   `-- repositories.manifest
# |
# |-- t12a
# |   |-- libbaz-1.0.0.tar.gz
# |   |-- libbar-0.1.0.tar.gz   -> libbaz
# |   `-- repositories.manifest
# |
# |-- t12b                      -> t12a (prerequisite repository)
# |   |-- libbaz-0.1.0.tar.gz
# |   |-- libbar-1.0.0.tar.gz   -> libbaz == 0.1.0
# |   |-- foo-0.1.0.tar.gz
# |   |-- foo-1.0.0.tar.gz      -> libbar
# |   |-- bar-1.0.0.tar.gz      -> libbar == 0.1.0
# |   |-- baz-0.1.0.tar.gz      -> libbaz
# |   |-- baz-1.0.0.tar.gz      -> libbaz == 1.0.0
# |   `-- repositories.manifest
# |
# |-- t13a
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- biz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- box-1.0.0.tar.gz      -> liba {prefer {} accept (true) reflect {...}}
# |   `-- repositories.manifest
# |
# |-- t13b
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- biz-1.0.0.tar.gz      -> liba {require {...}}
# |   `-- repositories.manifest
# |
# |-- t13c
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...) reflect {...}}
# |   |-- baz-1.0.0.tar.gz      -> liba {require {...}}
# |   `-- repositories.manifest
# |
# |-- t13d
# |   |-- liba-0.1.0.tar.gz
# |   |-- libb-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...) reflect {...}},
# |   |                            libb ? (...)
# |   |-- baz-1.0.0.tar.gz      -> bar, liba {require {...}}
# |   `-- repositories.manifest
# |
# |-- t13e
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)},
# |   |                            bar ? (...),
# |   |                            biz
# |   |-- biz-1.0.0.tar.gz      -> liba {require {...}}
# |   `-- repositories.manifest
# |
# |-- t13f
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   `-- repositories.manifest
# |
# |-- t13g
# |   |-- liba-0.1.0.tar.gz
# |   |-- libb-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...) reflect {...}},
# |   |                            libb {prefer {...} accept (...) reflect {...}}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...) reflect {...}},
# |   |                            libb ? (...)
# |   |-- biz-1.0.0.tar.gz      -> liba {prefer {...} accept (...) reflect {...}},
# |   |                            libb {prefer {...} accept (...) reflect {...}}
# |   |-- box-1.0.0.tar.gz      -> liba {prefer {...} accept (...) reflect {...}},
# |   |                            libb {prefer {...} accept (...) reflect {...}}
# |   `-- repositories.manifest
# |
# |-- t13h
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   `-- repositories.manifest
# |
# |-- t13i
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {require {...} reflect {...}}
# |   `-- repositories.manifest
# |
# |-- t13j
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {require {...}}
# |   |-- biz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   `-- repositories.manifest
# |
# |-- t13k
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)}
# |   `-- repositories.manifest
# |
# |-- t13l
# |   |-- liba-0.1.0.tar.gz
# |   |-- libb-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {require {...}},
# |   |                            libb ? (...)
# |   |-- baz-1.0.0.tar.gz      -> liba {prefer {...} accept (...)},
# |   |                            libb ? (...)
# |   `-- repositories.manifest
# |
# |-- t13m
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {require {...}}
# |   |-- baz-1.0.0.tar.gz      -> liba {require {...}},
# |   |                            bar  { enable (...) reflect {...}}
# |   |-- biz-1.0.0.tar.gz      -> liba {require {...}}
# |   |-- bix-1.0.0.tar.gz      -> liba {require {...}}
# |   |-- box-1.0.0.tar.gz      -> liba {require {...}}
# |   `-- repositories.manifest
# |
# |-- t13n
# |   |-- liba-0.1.0.tar.gz
# |   |-- libb-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {reflect {...}},
# |   |                            libb {reflect {...}}
# |   `-- repositories.manifest
# |
# |-- t13o
# |   |-- liba-0.1.0.tar.gz
# |   |-- bar-1.0.0.tar.gz      -> liba {reflect {...}}
# |   |-- baz-1.0.0.tar.gz      -> bar  {require {...}}
# |   |-- biz-1.0.0.tar.gz      -> bar  {prefer {...} accept (...)}
# |   |-- bix-1.0.0.tar.gz      -> bar  {prefer {...} accept (...)}
# |   `-- repositories.manifest
# |
# |-- t14a
# |   |-- libfoo-1.0.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t14b
# |   |-- libfoo-1.1.0.tar.gz
# |   `-- repositories.manifest
# |
# |-- t14c
# |   |-- libfoo-1.1.0+1.tar.gz
# |   `-- repositories.manifest
# |
# |-- t14d
# |   |-- libfoo-1.1.0+2.tar.gz
# |   `-- repositories.manifest
# |
# |-- t14e
# |   |-- libfoo-1.1.0+3.tar.gz
# |   `-- repositories.manifest
# |
# |-- t14f
# |   |-- libfoo-1.1.1.tar.gz
# |   `-- repositories.manifest
# |
# |-- t14i
# |   |-- libfoo-1.2.0.tar.gz
# |   `-- repositories.manifest
# |
# `-- git
#     |-- libbar.git            -> style-basic.git (prerequisite repository)
#     |-- libbaz.git
#     `-- style-basic.git

posix = ($cxx.target.class != 'windows')

# Prepare repositories used by tests if running in the local mode.
#
+if! $remote
  rep_create += 2>!

  cp -r $src/t0a  $out/t0a  && $rep_create $out/t0a  &$out/t0a/packages.manifest
  cp -r $src/t0b  $out/t0b  && $rep_create $out/t0b  &$out/t0b/packages.manifest
  cp -r $src/t0c  $out/t0c  && $rep_create $out/t0c  &$out/t0c/packages.manifest
  cp -r $src/t0d  $out/t0d  && $rep_create $out/t0d  &$out/t0d/packages.manifest
  cp -r $src/t1   $out/t1   && $rep_create $out/t1   &$out/t1/packages.manifest
  cp -r $src/t2   $out/t2   && $rep_create $out/t2   &$out/t2/packages.manifest
  cp -r $src/t3   $out/t3   && $rep_create $out/t3   &$out/t3/packages.manifest
  cp -r $src/t4a  $out/t4a  && $rep_create $out/t4a  &$out/t4a/packages.manifest
  cp -r $src/t4b  $out/t4b  && $rep_create $out/t4b  &$out/t4b/packages.manifest
  cp -r $src/t4c  $out/t4c  && $rep_create $out/t4c  &$out/t4c/packages.manifest
  cp -r $src/t4d  $out/t4d  && $rep_create $out/t4d  &$out/t4d/packages.manifest
  cp -r $src/t4e  $out/t4e  && $rep_create $out/t4e  &$out/t4e/packages.manifest
  cp -r $src/t4f  $out/t4f  && $rep_create $out/t4f  &$out/t4f/packages.manifest
  cp -r $src/t4i  $out/t4i  && $rep_create $out/t4i  &$out/t4i/packages.manifest
  cp -r $src/t4j  $out/t4j  && $rep_create $out/t4j  &$out/t4j/packages.manifest
  cp -r $src/t4k  $out/t4k  && $rep_create $out/t4k  &$out/t4k/packages.manifest
  cp -r $src/t5   $out/t5   && $rep_create $out/t5   &$out/t5/packages.manifest
  cp -r $src/t6   $out/t6   && $rep_create $out/t6   &$out/t6/packages.manifest
  cp -r $src/t7a  $out/t7a  && $rep_create $out/t7a  &$out/t7a/packages.manifest
  cp -r $src/t7b  $out/t7b  && $rep_create $out/t7b  &$out/t7b/packages.manifest
  cp -r $src/t8a  $out/t8a  && $rep_create $out/t8a  &$out/t8a/packages.manifest
  cp -r $src/t9   $out/t9   && $rep_create $out/t9   &$out/t9/packages.manifest
  cp -r $src/t10  $out/t10  && $rep_create $out/t10  &$out/t10/packages.manifest
  cp -r $src/t11a $out/t11a && $rep_create $out/t11a &$out/t11a/packages.manifest
  cp -r $src/t12a $out/t12a && $rep_create $out/t12a &$out/t12a/packages.manifest
  cp -r $src/t12b $out/t12b && $rep_create $out/t12b &$out/t12b/packages.manifest
  cp -r $src/t13a $out/t13a && $rep_create $out/t13a &$out/t13a/packages.manifest
  cp -r $src/t13b $out/t13b && $rep_create $out/t13b &$out/t13b/packages.manifest
  cp -r $src/t13c $out/t13c && $rep_create $out/t13c &$out/t13c/packages.manifest
  cp -r $src/t13d $out/t13d && $rep_create $out/t13d &$out/t13d/packages.manifest
  cp -r $src/t13e $out/t13e && $rep_create $out/t13e &$out/t13e/packages.manifest
  cp -r $src/t13f $out/t13f && $rep_create $out/t13f &$out/t13f/packages.manifest
  cp -r $src/t13g $out/t13g && $rep_create $out/t13g &$out/t13g/packages.manifest
  cp -r $src/t13h $out/t13h && $rep_create $out/t13h &$out/t13h/packages.manifest
  cp -r $src/t13i $out/t13i && $rep_create $out/t13i &$out/t13i/packages.manifest
  cp -r $src/t13j $out/t13j && $rep_create $out/t13j &$out/t13j/packages.manifest
  cp -r $src/t13k $out/t13k && $rep_create $out/t13k &$out/t13k/packages.manifest
  cp -r $src/t13l $out/t13l && $rep_create $out/t13l &$out/t13l/packages.manifest
  cp -r $src/t13m $out/t13m && $rep_create $out/t13m &$out/t13m/packages.manifest
  cp -r $src/t13n $out/t13n && $rep_create $out/t13n &$out/t13n/packages.manifest
  cp -r $src/t13o $out/t13o && $rep_create $out/t13o &$out/t13o/packages.manifest
  cp -r $src/t14a $out/t14a && $rep_create $out/t14a &$out/t14a/packages.manifest
  cp -r $src/t14b $out/t14b && $rep_create $out/t14b &$out/t14b/packages.manifest
  cp -r $src/t14c $out/t14c && $rep_create $out/t14c &$out/t14c/packages.manifest
  cp -r $src/t14d $out/t14d && $rep_create $out/t14d &$out/t14d/packages.manifest
  cp -r $src/t14e $out/t14e && $rep_create $out/t14e &$out/t14e/packages.manifest
  cp -r $src/t14f $out/t14f && $rep_create $out/t14f &$out/t14f/packages.manifest
  cp -r $src/t14i $out/t14i && $rep_create $out/t14i &$out/t14i/packages.manifest
  cp -r $src/t15  $out/t15  && $rep_create $out/t15  &$out/t15/packages.manifest --ignore-unknown

  # Create git repositories.
  #
  $git_extract $src/git/style-basic.tar
  $git_extract $src/git/libbar.tar &$out_git/state0/***
  $git_extract $src/git/libbaz.tar &$out_git/state1/***
end

config_cxx = [cmdline] config.cxx=$quote($recall($cxx.path) $cxx.config.mode, true)

tar = [cmdline] ($posix ? tar : bsdtar)

cfg_create    += 2>!
cfg_link      += 2>!
pkg_configure += -d cfg 2>!
pkg_disfigure += -d cfg
pkg_drop      += -d cfg --yes 2>!
pkg_fetch     += -d cfg 2>!
pkg_purge     += -d cfg
pkg_status    += -d cfg
pkg_unpack    += -d cfg 2>!
rep_add       += -d cfg 2>!
rep_remove    += -d cfg 2>!
rep_fetch     += -d cfg --auth all --trust-yes 2>!
rep_list      += -d cfg

# Let's disable the progress indication that complicates stderr output
# validation.
#
test.options += --no-progress

# Disable the use of the system package manager.
#
test.arguments += --sys-no-query

: libfoo
:
: Test building different versions of libfoo.
:
{
  test.arguments += --print-only

  : no-name
  :
  $clone_root_cfg;
  $* 2>>EOE != 0
    error: package name argument expected
      info: run 'bpkg help pkg-build' for more information
    EOE

  : version
  :
  {
    : empty
    :
    $clone_root_cfg;
    $* libfoo/ 2>>EOE != 0
      error: empty package version in 'libfoo/'
      EOE

    : earliest
    :
    $clone_root_cfg;
    $* libfoo/1.0.0- 2>>EOE != 0
      error: invalid package version '1.0.0-' in 'libfoo/1.0.0-': earliest version
      EOE

    : earliest-constraint
    :
    $clone_root_cfg;
    $* -- 'libfoo == 1.0.0-' 2>>EOE != 0
      error: invalid package version constraint '== 1.0.0-' in 'libfoo == 1.0.0-': invalid version: equal version endpoints are earliest
      EOE

    : stub
    :
    $clone_root_cfg;
    $* libfoo/0+1 2>>EOE != 0
      error: invalid package version '0+1' in 'libfoo/0+1': stub version
      EOE

    : stub-constraint
    :
    $clone_root_cfg;
    $* -- 'libfoo [0 1]' 2>>EOE != 0
      error: invalid package version constraint '[0 1]' in 'libfoo [0 1]': endpoint is a stub
      EOE
  }

  : unknown-package
  :
  $clone_root_cfg;
  $* libfoo 2>>/EOE != 0
    error: unknown package libfoo
      info: configuration cfg/ has no repositories
      info: use 'bpkg rep-add' to add a repository
    EOE

  : unknown-package-ver
  :
  $clone_root_cfg;
  $* libfoo/1.0.0 2>>/EOE != 0
    error: unknown package libfoo
      info: configuration cfg/ has no repositories
      info: use 'bpkg rep-add' to add a repository
    EOE

  : unknown-package-constraint
  :
  $clone_root_cfg;
  $* 'libfoo>1.0.0' 2>>/EOE != 0
    error: unknown package libfoo
      info: configuration cfg/ has no repositories
      info: use 'bpkg rep-add' to add a repository
    EOE

  : mask-repository-not-found
  :
  $clone_root_cfg;
  $* --mask-repository 'https://example.com/1' libfoo 2>>EOE != 0
    error: repository 'https://example.com/1' cannot be masked: not found
    EOE

  : mask-repository-empty
  :
  $clone_root_cfg;
  $* --mask-repository '' libfoo 2>>EOE != 0
    error: repository '' cannot be masked: invalid repository location: empty URL
    EOE

  : mask-repository-uuid-db-not-found
  :
  $clone_root_cfg;
  $* --mask-repository-uuid '00000000-0000-0000-0000-123456789012=repo' libfoo 2>>/EOE != 0
    error: configuration repository '00000000-0000-0000-0000-123456789012=repo' cannot be masked: no configuration with uuid 00000000-0000-0000-0000-123456789012 is linked with cfg/
    EOE

  : mask-repository-uuid-empty
  :
  $clone_root_cfg;
  $* --mask-repository-uuid "$cfg_uuid=" libfoo 2>>EOE != 0
    error: configuration repository '00000000-0000-0000-0000-000000000001=' cannot be masked: invalid repository location '': empty URL
    EOE

  : mask-repository-uuid-not-found
  :
  $clone_root_cfg;
  $* --mask-repository-uuid "$cfg_uuid=https://example.com/1" libfoo 2>>EOE != 0
    error: configuration repository '00000000-0000-0000-0000-000000000001=https://example.com/1' cannot be masked: repository location 'https://example.com/1' not found in configuration 00000000-0000-0000-0000-000000000001
    EOE

  : archive
  :
  $clone_root_cfg;
  $* $src/libfoo-1.1.0.tar.gz >'new libfoo/1.1.0'

  : dir
  :
  $clone_root_cfg;
  $* $src/libfoo-1.1.0/ >'new libfoo/1.1.0'

  : unpacked-dir
  :
  {
    $clone_root_cfg && $pkg_unpack -e $src/libfoo-1.1.0;

    $* libfoo               >'update libfoo/1.1.0';
    $* libfoo/1.1.0         >'update libfoo/1.1.0';
    $* -- 'libfoo == 1.1.0' >'update libfoo/1.1.0';
    $* libfoo libfoo        >'update libfoo/1.1.0';

    $* libfoo libfoo/1.1.0 2>>EOE != 0;
      error: duplicate package libfoo
        info: first mentioned as libfoo
        info: second mentioned as libfoo/1.1.0
      EOE

    $* libfoo/1.1.0 libfoo 2>>EOE != 0;
      error: duplicate package libfoo
        info: first mentioned as libfoo/1.1.0
        info: second mentioned as libfoo
      EOE

    $* libfoo/1.1.0 libfoo/1.1.0 >'update libfoo/1.1.0';

    $* libfoo/1.0.0 2>>/EOE != 0;
      error: unknown package libfoo
        info: configuration cfg/ has no repositories
        info: use 'bpkg rep-add' to add a repository
      EOE

    $pkg_purge libfoo 2>'purged libfoo/1.1.0'
  }

  : t1
  :
  {
    +$clone_root_cfg && $rep_add $rep/t1 && $rep_fetch

    : downgrade
    :
    {
      $clone_cfg && $pkg_unpack -e $src/libfoo-1.1.0;

      $* libfoo       >'update libfoo/1.1.0';
      $* libfoo/1.0.0 >'downgrade libfoo/1.0.0';

      $* libfoo/0.0.1 2>>EOE != 0;
        error: libfoo/0.0.1 is not available in source
          info: specify sys:libfoo/0.0.1 if it is available from the system
        EOE

      $pkg_purge libfoo 2>'purged libfoo/1.1.0'
    }

    : downgrade-constraint
    :
    {
      $clone_cfg && $pkg_unpack -e $src/libfoo-1.1.0;

      $* libfoo         >'update libfoo/1.1.0';
      $* 'libfoo<1.1.0' >'downgrade libfoo/1.0.0';

      $* 'libfoo<1.0.0' 2>>EOE != 0;
        error: 'libfoo < 1.0.0' is not available in source
          info: specify sys:libfoo/... if it is available from the system
        EOE

      $pkg_purge libfoo 2>'purged libfoo/1.1.0'
    }

    : upgrade
    :
    {
      $clone_cfg;
      $pkg_fetch -e $src/libfoo-0.0.1.tar.gz && $pkg_unpack libfoo;
      $pkg_fetch -e $src/libfix-0.0.1.tar.gz && $pkg_unpack libfix;

      $* libfoo >'upgrade libfoo/1.0.0';

      $* libfoo/0.0.1 >>EOE;
        update libfix/0.0.1 (required by libfoo)
        update libfoo/0.0.1
        EOE

      $* libfoo/1.1.0 2>>EOE != 0;
        error: libfoo/1.1.0 is not available in source
          info: specify sys:libfoo/1.1.0 if it is available from the system
        EOE

      $pkg_purge libfoo 2>'purged libfoo/0.0.1';
      $pkg_purge libfix 2>'purged libfix/0.0.1'
    }

    : upgrade-failure
    :
    {
      $clone_cfg;

      $* libfoo       >'new libfoo/1.0.0';
      $* libfoo/1.0.0 >'new libfoo/1.0.0';

      $* libfoo/1.1.0 2>>EOE != 0
        error: libfoo/1.1.0 is not available in source
          info: specify sys:libfoo/1.1.0 if it is available from the system
        EOE
    }
  }

  : revision
  :
  {
    +$clone_root_cfg
    +$rep_add $rep/t4e && $rep_fetch

    : latest
    :
    {
      $clone_cfg;

      $* libfoo/1.1.0 >>EOO
        new libfoo/1.1.0+1
        EOO
    }

    : zero
    :
    {
      $clone_cfg;

      $* libfoo/1.1.0+0 >>EOO
        new libfoo/1.1.0
        EOO
    }
  }
}

: libbar-libfoo
:
: Test building libbar that depends on libfoo.
:
{
  test.arguments += --print-only

  : unknown-dependency
  :
  $clone_root_cfg;
  $* $src/libbar-1.0.0.tar.gz 2>>EOE != 0
    error: no package available for dependency libfoo of package libbar
    info: while satisfying libbar/1.0.0
    EOE

  : unknown-dependency-config
  :
  : As above but with a linked configuration.
  :
  $clone_root_cfg;
  $cfg_create -d cfg2 &cfg2/***;
  $cfg_link -d cfg cfg2;
  $* $src/libbar-1.0.0.tar.gz +{ --config-id 1 } 2>>~%EOE% != 0
    %error: no package available for dependency libfoo of package libbar \[cfg2.\]%
    %info: while satisfying libbar/1.0.0 \[cfg2.\]%
    EOE

  : t2
  :
  {
    +$clone_root_cfg && $rep_add $rep/t2 && $rep_fetch

    : build-dependency
    :
    {
      $clone_cfg;

      $* libbar >>EOO;
        new libfoo/1.0.0 (required by libbar)
        new libbar/1.0.0
        EOO

      $* libbar libfoo >>EOO;
        new libfoo/1.0.0
        new libbar/1.0.0
        EOO

      $* libbar libfoo/1.0.0 >>EOO;
        new libfoo/1.0.0
        new libbar/1.0.0
        EOO

      $* libbar libfoo libbar/1.0.0 2>>EOE != 0;
        error: duplicate package libbar
          info: first mentioned as libbar
          info: second mentioned as libbar/1.0.0
        EOE

      $* libbar libfoo/1.1.0 2>>EOE != 0
        error: libfoo/1.1.0 is not available in source
          info: specify sys:libfoo/1.1.0 if it is available from the system
        EOE
    }

    : upgrade-dependency
    :
    {
      $clone_cfg;
      $pkg_fetch -e $src/libfoo-0.0.1.tar.gz && $pkg_unpack libfoo;
      $pkg_fetch -e $src/libfix-0.0.1.tar.gz && $pkg_unpack libfix;

      $* libbar >>EOO;
        update libfix/0.0.1 (required by libfoo)
        update libfoo/0.0.1 (required by libbar)
        new libbar/1.0.0
        EOO

      $* libbar libfoo >>EOO;
        upgrade libfoo/1.0.0
        new libbar/1.0.0
        EOO

      $* libbar libfoo/0.0.1 >>EOO;
        update libfix/0.0.1 (required by libfoo)
        update libfoo/0.0.1
        new libbar/1.0.0
        EOO

      $pkg_purge libfoo 2>'purged libfoo/0.0.1';
      $pkg_purge libfix 2>'purged libfix/0.0.1'
    }

    : downgrade-dependency
    :
    {
      $clone_cfg && $pkg_unpack -e $src/libfoo-1.1.0;

      $* libbar >>EOO;
        update libfoo/1.1.0 (required by libbar)
        new libbar/1.0.0
        EOO

      $* libbar libfoo >>EOO;
        update libfoo/1.1.0
        new libbar/1.0.0
        EOO

      $* libbar libfoo/1.0.0 >>EOO;
        downgrade libfoo/1.0.0
        new libbar/1.0.0
        EOO

      $pkg_purge libfoo 2>'purged libfoo/1.1.0'
    }
  }

  : dependency-revision
  :
  {
    +$clone_root_cfg && $rep_add $rep/t4e && $rep_fetch

    : latest
    :
    {
      $clone_cfg;

      $* libbar/1.1.0 >>EOO
        new libfoo/1.1.0+1 (required by libbar)
        new libbar/1.1.0
        EOO
    }

    : latest-config
    :
    : As above but with a linked configuration.
    :
    {
      $clone_cfg;
      $cfg_create -d cfg2 &cfg2/***;
      $cfg_link -d cfg cfg2;

      $* "libbar/1.1.0@$rep/t4e" +{ --config-id 1 } --trust-yes >>~%EOO% 2>!
        %new libfoo/1.1.0\+1 \[cfg2.\] \(required by libbar \[cfg2.\]\)%
        %new libbar/1.1.0 \[cfg2.\]%
        EOO
    }

    : zero
    :
    {
      $clone_cfg;

      $* libbar/1.1.1 >>EOO
        new libfoo/1.1.0 (required by libbar)
        new libbar/1.1.1
        EOO
    }
  }
}

: libbaz-libbar
:
: Test building libbaz that depends on libbar; libbar is in prerequisite
: repository.
:
{
  test.arguments += --print-only

  : t3
  :
  {
    +$clone_root_cfg && $rep_add $rep/t3 && $rep_fetch

    : prerequisites-build-failure
    :
    : Fail to build packages that are only in prerequisite repository.
    :
    {
      $clone_cfg;

      $* libfoo 2>>EOE != 0;
        error: unknown package libfoo
        EOE

      $* libbar 2>>EOE != 0;
        error: unknown package libbar
        EOE

      $* libbaz libbar 2>>EOE != 0
        error: unknown package libbar
        EOE
    }

    : prerequisites-build
    :
    $clone_cfg;
    $* libbaz >>EOO
      new libfoo/1.0.0 (required by libbar)
      new libbar/1.0.0 (required by libbaz)
      new libbaz/1.0.0
      EOO

    : different-build-order
    :
    {
      +$clone_cfg && $rep_add $rep/t2 && $rep_fetch

      : fox-foo
      :
      $clone_cfg;
      $* libfox libfoo >>EOO
        new libfox/1.0.0
        new libfoo/1.0.0
        EOO

      : foo-fox
      :
      $clone_cfg;
      $* libfoo libfox >>EOO
        new libfoo/1.0.0
        new libfox/1.0.0
        EOO

      : baz-foo
      :
      $clone_cfg;
      $* libbaz libfoo >>EOO
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : foo-baz
      :
      $clone_cfg;
      $* libfoo libbaz >>EOO
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : baz-fox
      :
      $clone_cfg;
      $* libbaz libfox >>EOO
        new libfoo/1.0.0 (required by libbar)
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        new libfox/1.0.0
        EOO

      : fox-baz
      :
      $clone_cfg;
      $* libfox libbaz >>EOO
        new libfox/1.0.0
        new libfoo/1.0.0 (required by libbar)
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : fox-foo-baz
      :
      $clone_cfg;
      $* libfox libfoo libbaz >>EOO
        new libfox/1.0.0
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : fox-baz-foo
      :
      $clone_cfg;
      $* libfox libbaz libfoo >>EOO
        new libfox/1.0.0
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : foo-fox-baz
      :
      $clone_cfg;
      $* libfoo libfox libbaz >>EOO
        new libfoo/1.0.0
        new libfox/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : foo-baz-fox
      :
      $clone_cfg;
      $* libfoo libbaz libfox >>EOO
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        new libfox/1.0.0
        EOO

      : baz-fox-foo
      :
      : This one is contradictory: baz before fox but fox before foo.
      :
      $clone_cfg;
      $* libbaz libfox libfoo >>EOO
        new libfox/1.0.0
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        EOO

      : baz-foo-fox
      :
      $clone_cfg;
      $* libbaz libfoo libfox >>EOO
        new libfoo/1.0.0
        new libbar/1.0.0 (required by libbaz)
        new libbaz/1.0.0
        new libfox/1.0.0
        EOO

      : baz-foo-bar
      :
      $clone_cfg;
      $* libbaz libfoo libbar >>EOO
        new libfoo/1.0.0
        new libbar/1.0.0
        new libbaz/1.0.0
        EOO

      : baz-bar-foo
      :
      $clone_cfg;
      $* libbaz libbar libfoo >>EOO
        new libfoo/1.0.0
        new libbar/1.0.0
        new libbaz/1.0.0
        EOO
    }
  }
}

: libbaz-libfoo-libbar
:
: Test building libbaz that depends on libfoo and libbar; libbar depends on
: libfoo == 1.1.0.
:
{
  test.arguments += --print-only

  : t4c
  :
  {
    +$clone_root_cfg && $rep_add $rep/t4c && $rep_fetch

    : baz
    :
    $clone_cfg;
    $* libbaz >>EOO
      new libfoo/1.1.0 (required by libbar, libbaz)
      new libbar/1.1.0 (required by libbaz)
      new libbaz/1.1.0
      EOO

    : foo-baz
    :
    $clone_cfg;
    $* libfoo libbaz >>EOO
      new libfoo/1.1.0
      new libbar/1.1.0 (required by libbaz)
      new libbaz/1.1.0
      EOO

    : libbaz-unable-satisfy
    :
    {
      +$clone_cfg

      : basic
      :
      {
        $clone_cfg;

        $* libfoo/1.0.0 libbaz 2>>EOE != 0
        error: unable to satisfy constraints on package libfoo
          info: command line depends on (libfoo == 1.0.0)
          info: libbar/1.1.0 depends on (libfoo == 1.1.0)
          info: available libfoo/1.0.0
          info: available libfoo/1.1.0
          info: while satisfying libbar/1.1.0
          info: while satisfying libbaz/1.1.0
          info: explicitly specify libfoo version to manually satisfy both constraints
        EOE
      }

      : unable-satisfy-reorder
      :
      : As above but the packages are specified in a different order on the
      : command line.
      :
      {
        $clone_cfg;

        $* libbaz libfoo/1.0.0 2>>EOE != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: while satisfying libbaz/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : unable-satisfy-dependency
      :
      : As above but specify libfoo as a dependency.
      :
      {
        $clone_cfg;

        $* libbaz ?libfoo/1.0.0 2>>EOE != 0
          error: unable to satisfy constraints on package libfoo
            info: libbaz/1.1.0 depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: while satisfying libbaz/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : unable-satisfy-config
      :
      : As above but with a linked configuration.
      :
      {
        $clone_cfg;
        $cfg_create -d cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;
        $rep_add -d cfg2 $rep/t4c && $rep_fetch -d cfg2;
        $* libbaz ?libbar +{ --config-id 1 } libfoo/1.0.0 +{ --config-id 1 } 2>>~%EOE% != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
          %  info: libbar/1.1.0 \[cfg2.\] depends on \(libfoo == 1.1.0\)%
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
          %  info: while satisfying libbar/1.1.0 \[cfg2.\]%
            info: while satisfying libbaz/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }
    }

    : libbar-unable-satisfy
    :
    {
      +$clone_cfg
      +$rep_add $rep/t4b && $rep_fetch

      : basic
      :
      {
        $clone_cfg;

        $* libfoo/1.0.0 libbar 2>>EOE != 0
        error: unable to satisfy constraints on package libfoo
          info: command line depends on (libfoo == 1.0.0)
          info: libbar/1.1.0 depends on (libfoo == 1.1.0)
          info: available libfoo/1.0.0
          info: available libfoo/1.1.0
          info: while satisfying libbar/1.1.0
          info: explicitly specify libfoo version to manually satisfy both constraints
        EOE
      }

      : unable-satisfy-reorder
      :
      : As above but the packages are specified in a different order on the
      : command line.
      :
      {
        $clone_cfg;

        $* libbar libfoo/1.0.0 2>>EOE != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : unable-satisfy-dependency
      :
      : Similar to the above, but specify libfoo as a dependency.
      :
      {
        $clone_cfg;

        # Add libbaz, so that libfoo package is available from its dependents
        # (libbaz) repositories.
        #
        $* libbar ?libfoo/1.0.0 libbaz 2>>EOE != 0
          error: package libfoo doesn't satisfy its dependents
            info: libfoo/1.0.0 doesn't satisfy libbar/1.1.0
          EOE
      }
    }

    : not-available
    :
    $clone_cfg;
    $* libfoo/1.1.0 libbaz 2>>EOE != 0
      error: libfoo/1.1.0 is not available in source
        info: specify sys:libfoo/1.1.0 if it is available from the system
      EOE

    : upgrade
    :
    {
      $clone_cfg;
      $pkg_fetch -e $src/libfoo-0.0.1.tar.gz && $pkg_unpack libfoo;
      $pkg_fetch -e $src/libfix-0.0.1.tar.gz && $pkg_unpack libfix;

      $* libbaz >>EOO;
        upgrade libfoo/1.1.0 (required by libbar, libbaz)
        new libbar/1.1.0 (required by libbaz)
        new libbaz/1.1.0
        EOO

      $pkg_purge libfoo 2>'purged libfoo/0.0.1';
      $pkg_purge libfix 2>'purged libfix/0.0.1'
    }

    : downgrade
    :
    {
      $clone_cfg;
      $pkg_fetch -e $src/libfoo-1.2.0.tar.gz && $pkg_unpack libfoo;

      $* libbaz >>EOO;
        downgrade libfoo/1.1.0 (required by libbar, libbaz)
        new libbar/1.1.0 (required by libbaz)
        new libbaz/1.1.0
        EOO

      $rep_add $rep/t4a && $rep_fetch;

      $* libfoo/1.1.0 libbaz >>EOO;
        downgrade libfoo/1.1.0
        new libbar/1.1.0 (required by libbaz)
        new libbaz/1.1.0
        EOO

      $pkg_purge libfoo 2>'purged libfoo/1.2.0'
    }

    : unable-downgrade
    :
    : Test that dependent prevents up/downgrade that would break dependency
    : constraints.
    :
    {
      $clone_cfg;

      $rep_add $rep/t4a $rep/t4b && $rep_fetch;
      $pkg_build libfoo/1.1.0 libbar/1.1.0 -d cfg 2>!;

      $* libfoo-1.2.0.tar.gz 2>>EOE != 0;
        error: unknown package libfoo-1.2.0.tar.gz
        EOE

      $* libfoo/1.0.0 2>>EOE != 0;
        error: unable to downgrade package libfoo/1.1.0 to 1.0.0
          info: because configured package libbar/1.1.0 depends on (libfoo == 1.1.0)
          info: re-run with -v for additional dependency information
          info: consider re-trying with --upgrade|-u potentially combined with --recursive|-r
          info: or explicitly request up/downgrade of package libbar
          info: or explicitly specify package libfoo version to manually satisfy these constraints
        EOE

      $* libfoo/1.1.0 --keep-unused >'update libfoo/1.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
      $pkg_purge     libbar 2>'purged libbar/1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }

    : unable-downgrade-config
    :
    : As above but with a linked configuration.
    :
    {
      $clone_cfg;
      $cfg_create -d cfg2 &cfg2/***;
      $rep_add -d cfg2 $rep/t4a $rep/t4b $rep/t4c && $rep_fetch -d cfg2;
      $cfg_link -d cfg2 cfg;

      $rep_add $rep/t4a $rep/t4b && $rep_fetch;
      $pkg_build libfoo/1.1.0 libbar/1.1.0 -d cfg 2>!;

      $* libfoo-1.2.0.tar.gz 2>>EOE != 0;
        error: unknown package libfoo-1.2.0.tar.gz
        EOE

      test.arguments = $regex.apply($test.arguments, cfg, cfg2);

      $* libfoo/1.0.0 +{ --config-id 1 } 2>>~%EOE% != 0;
        %error: unable to downgrade package libfoo/1.1.0 \[cfg.\] to 1.0.0%
        %  info: because configured package libbar/1.1.0 \[cfg.\] depends on \(libfoo == 1.1.0\)%
          info: re-run with -v for additional dependency information
          info: consider re-trying with --upgrade|-u potentially combined with --recursive|-r
          info: or explicitly request up/downgrade of package libbar
          info: or explicitly specify package libfoo version to manually satisfy these constraints
        EOE

      test.arguments = $regex.apply($test.arguments, cfg2, cfg);

      $* libfoo/1.1.0 --keep-unused >'update libfoo/1.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
      $pkg_purge     libbar 2>'purged libbar/1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }

    : able-downgrade
    :
    : Similar to the above unable-downgrade, but this time libfoo and libbar
    : are configured manually and so are not held. Thus, libfoo downgrades
    : successfully since libbar is just dropped having no dependents.
    :
    {
      $clone_cfg;

      $pkg_fetch libfoo/1.1.0 && $pkg_unpack libfoo && $pkg_configure libfoo;
      $pkg_fetch libbar/1.1.0 && $pkg_unpack libbar && $pkg_configure libbar;

      $* libfoo/1.0.0 >>EOO;
        downgrade libfoo/1.0.0
        drop libbar/1.1.0 (unused)
        EOO

      $pkg_drop libbar libfoo
    }

    : able-downgrade-config
    :
    : As above but with a linked configuration.
    :
    {
      $clone_cfg;
      $cfg_create -d cfg2 &cfg2/***;
      $rep_add -d cfg2 $rep/t4c && $rep_fetch -d cfg2;
      $cfg_link -d cfg2 cfg;

      $pkg_fetch libfoo/1.1.0 && $pkg_unpack libfoo && $pkg_configure libfoo;
      $pkg_fetch libbar/1.1.0 && $pkg_unpack libbar && $pkg_configure libbar;

      test.arguments = $regex.apply($test.arguments, cfg, cfg2);

      $* libfoo/1.0.0 +{ --config-id 1 } >>~%EOO%;
        %downgrade libfoo/1.0.0 \[cfg.\]%
        %drop libbar/1.1.0 \[cfg.\] \(unused\)%
        EOO

      $pkg_drop libbar libfoo
    }
  }

  : dependent-reconfiguration
  :
  {
    test.arguments += --keep-unused

    +$clone_root_cfg

    +$pkg_fetch -e $src/libfoo-1.0.0.tar.gz && $pkg_unpack libfoo
    +$pkg_configure libfoo

    +$pkg_fetch -e $src/libbar-1.0.0.tar.gz && $pkg_unpack libbar
    +$pkg_configure libbar

    +$pkg_fetch -e $src/libbaz-1.1.0.tar.gz && $pkg_unpack libbaz
    +$pkg_configure libbaz

    +$rep_add $rep/t4a && $rep_add $rep/t4b && $rep_fetch

    : bar
    :
    : Only libbar/1.1.0 (that we are upgrading to) requires libfoo/1.1.0.
    : libbaz, that depends on libfoo and libbar, is happy with any version of
    : its dependencies.
    :
    $clone_cfg;
    $* libbar >>EOO
      upgrade libfoo/1.1.0 (required by libbar)
      upgrade libbar/1.1.0
      reconfigure libbaz (dependent of libbar, libfoo)
      EOO

    : foo
    :
    $clone_cfg;
    $* libfoo >>EOO
      upgrade libfoo/1.1.0
      reconfigure libbar (dependent of libfoo)
      reconfigure libbaz (dependent of libbar, libfoo)
      EOO

    : foo-bar
    :
    $clone_cfg;
    $* libfoo libbar/1.0.0 >>EOO
      upgrade libfoo/1.1.0
      reconfigure/update libbar/1.0.0
      reconfigure libbaz (dependent of libbar, libfoo)
      EOO

    : bar-foo
    :
    $clone_cfg;
    $* libbar/1.0.0 libfoo >>EOO
      upgrade libfoo/1.1.0
      reconfigure/update libbar/1.0.0
      reconfigure libbaz (dependent of libbar, libfoo)
      EOO

    : baz-foo
    :
    $clone_cfg;
    $* libbaz libfoo >>EOO
      upgrade libfoo/1.1.0
      reconfigure libbar (dependent of libfoo)
      reconfigure/update libbaz/1.1.0
      EOO

    : baz-foo-1.0.0
    :
    $clone_cfg;
    $* libbaz libfoo/1.0.0 >>EOO
      update libfoo/1.0.0
      update libbaz/1.1.0
      EOO

    -$pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0'
    -$pkg_purge     libbaz 2>'purged libbaz/1.1.0'

    -$pkg_disfigure libbar 2>'disfigured libbar/1.0.0'
    -$pkg_purge     libbar 2>'purged libbar/1.0.0'

    -$pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0'
    -$pkg_purge     libfoo 2>'purged libfoo/1.0.0'
  }
}

# Note that when we fetch a package from remote repository the bpkg stderr
# contains fetch program progress output, that comes prior the informational
# message.
#

: actual-build
:
{
  test.arguments += --yes

  : with-dependencies
  :
  {
    $clone_root_cfg && $rep_add $rep/t4c && $rep_fetch;

    $* libbaz 2>>~%EOE%;
      fetched libfoo/1.1.0
      unpacked libfoo/1.1.0
      fetched libbar/1.1.0
      unpacked libbar/1.1.0
      fetched libbaz/1.1.0
      unpacked libbaz/1.1.0
      configured libfoo/1.1.0
      configured libbar/1.1.0
      configured libbaz/1.1.0
      %info: .+ is up to date%
      updated libbaz/1.1.0
      EOE

    $pkg_status libfoo/1.1.0 >'libfoo configured 1.1.0';
    $pkg_status libbar/1.1.0 >'libbar configured 1.1.0';
    $pkg_status libbaz/1.1.0 >'!libbaz configured 1.1.0';

    $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
    $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

    $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
    $pkg_purge     libbar 2>'purged libbar/1.1.0';

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }

  : hold-fs-fetched
  :
  {
    : direct
    :
    {
      $clone_root_cfg;

      $* $src/libfoo-1.0.0.tar.gz 2>>~%EOE%;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured !1.0.0';

      $* $src/libfoo-1.1.0/ 2>>~%EOE%;
        disfigured libfoo/1.0.0
        using libfoo/1.1.0 (external)
        configured libfoo/1.1.0
        %info: .+ is up to date%
        updated libfoo/1.1.0
        EOE

      $pkg_status libfoo >'!libfoo configured !1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }

    : pre-fetch
    :
    {
      $clone_root_cfg;
      $pkg_fetch -e $src/libfoo-1.0.0.tar.gz && $pkg_unpack libfoo;
      $pkg_configure libfoo;

      $pkg_status libfoo >'libfoo configured 1.0.0';

      $* libfoo 2>>~%EOE%;
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.0.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
    }
  }

  : hold-repo-fetched
  :
  {
    +$clone_root_cfg && $rep_add $rep/t4c && $rep_fetch

    : package-version
    :
    {
      $clone_cfg;

      $* libfoo 2>>~%EOE%;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.0.0 available [1.1.0]';

      $* libfoo/1.0.0 2>>~%EOE%;
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured !1.0.0 available [1.1.0]';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
    }

    : version
    :
    {
      $clone_cfg;

      $* libfoo/1.0.0 2>>~%EOE%;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured !1.0.0 available [1.1.0]';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
    }

    : not-held
    :
    {
      $clone_cfg;

      $* libbaz 2>>~%EOE%;
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        fetched libbaz/1.1.0
        unpacked libbaz/1.1.0
        configured libfoo/1.1.0
        configured libbar/1.1.0
        configured libbaz/1.1.0
        %info: .+ is up to date%
        updated libbaz/1.1.0
        EOE

      $pkg_status libfoo >'libfoo configured 1.1.0';

      $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
      $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
      $pkg_purge     libbar 2>'purged libbar/1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }

    : forcing-upgrade-unheld
    :
    {
      $clone_cfg;

      $* libfoo 2>>~%EOE%;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.0.0 available [1.1.0]';

      $* libbaz 2>>~%EOE%;
        disfigured libfoo/1.0.0
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        fetched libbaz/1.1.0
        unpacked libbaz/1.1.0
        configured libfoo/1.1.0
        configured libbar/1.1.0
        configured libbaz/1.1.0
        %info: .+ is up to date%
        updated libbaz/1.1.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.1.0';

      $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
      $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
      $pkg_purge     libbar 2>'purged libbar/1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }

    : forcing-upgrade-held
    :
    {
      $clone_cfg;

      $* libfoo/1.0.0 2>>~%EOE%;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured !1.0.0 available [1.1.0]';

      $* libbaz 2>>EOE != 0;
        error: package libbar dependency on (libfoo == 1.1.0) is forcing upgrade of libfoo/1.0.0 to 1.1.0
          info: package version libfoo/1.0.0 is held
          info: explicitly request version upgrade to continue
        info: while satisfying libbar/1.1.0
        info: while satisfying libbaz/1.1.0
        EOE

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
    }

    : forcing-upgrade-held-config
    :
    : As above but with a linked configuration.
    :
    {
      $clone_cfg;
      $cfg_create -d cfg2 &cfg2/***;
      $cfg_link -d cfg cfg2;
      $rep_fetch -d cfg2 $rep/t4c;

      $* libfoo/1.0.0 +{ --config-id 1 } 2>>~%EOE%;
        %fetched libfoo/1.0.0 \[cfg2.\]%
        %unpacked libfoo/1.0.0 \[cfg2.\]%
        %configured libfoo/1.0.0 \[cfg2.\]%
        %info: .+ is up to date%
        %updated libfoo/1.0.0 \[cfg2.\]%
        EOE

      $pkg_status -d cfg2 libfoo >'!libfoo configured !1.0.0 available [1.1.0]';

      $* libbaz ?libbar +{ --config-id 1 } 2>>~%EOE% != 0;
        %error: package libbar \[cfg2.\] dependency on \(libfoo == 1.1.0\) is forcing upgrade of libfoo/1.0.0 \[cfg2.\] to 1.1.0%
        %  info: package version libfoo/1.0.0 \[cfg2.\] is held%
          info: explicitly request version upgrade to continue
        %info: while satisfying libbar/1.1.0 \[cfg2.\]%
        info: while satisfying libbaz/1.1.0
        EOE

      $pkg_disfigure -d cfg2 libfoo 2>'disfigured libfoo/1.0.0';
      $pkg_purge     -d cfg2 libfoo 2>'purged libfoo/1.0.0'
    }
  }

  : drop-dependencies
  :
  {
    $clone_root_cfg && $rep_add $rep/t2 && $rep_fetch;

    $* libbar 2>>~%EOE%;
      fetched libfoo/1.0.0
      unpacked libfoo/1.0.0
      fetched libbar/1.0.0
      unpacked libbar/1.0.0
      configured libfoo/1.0.0
      configured libbar/1.0.0
      %info: .+ is up to date%
      updated libbar/1.0.0
      EOE

    $pkg_status libfoo >'libfoo configured 1.0.0';
    $pkg_status libbar >'!libbar configured 1.0.0';

    $rep_add $rep/t5 && $rep_fetch;

    $* libbar 2>>~%EOE%;
      disfigured libbar/1.0.0
      disfigured libfoo/1.0.0
      purged libfoo/1.0.0
      fetched libbar/1.2.0
      unpacked libbar/1.2.0
      configured libbar/1.2.0
      %info: .+ is up to date%
      updated libbar/1.2.0
      EOE

    $pkg_status libfoo >'libfoo available 1.0.0 0.1.0';
    $pkg_status libbar >'!libbar configured 1.2.0';

    $* libbar/1.0.0 libfoo 2>>~%EOE%;
      disfigured libbar/1.2.0
      fetched libfoo/1.0.0
      unpacked libfoo/1.0.0
      fetched libbar/1.0.0
      unpacked libbar/1.0.0
      configured libfoo/1.0.0
      configured libbar/1.0.0
      %info: .+ is up to date%{2}
      updated libfoo/1.0.0
      updated libbar/1.0.0
      EOE

    $pkg_status libfoo >'!libfoo configured 1.0.0';
    $pkg_status libbar >'!libbar configured !1.0.0 available 1.2.0';

    $* libbar 2>>~%EOE%;
      disfigured libbar/1.0.0
      fetched libbar/1.2.0
      unpacked libbar/1.2.0
      configured libbar/1.2.0
      %info: .+ is up to date%
      updated libbar/1.2.0
      EOE

    $pkg_status libfoo >'!libfoo configured 1.0.0';
    $pkg_status libbar >'!libbar configured 1.2.0';

    $pkg_disfigure libbar 2>'disfigured libbar/1.2.0';
    $pkg_purge     libbar 2>'purged libbar/1.2.0';

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
  }

  : local-dependency
  :
  : Test that the local package can be built against the local dependency
  : package.
  :
  {
    # Prepare libbar and libbaz (libbaz->libbar) local packages using the
    # temporary configuration.
    #
    $clone_root_cfg;

    $pkg_fetch -e $src/t4b/libbar-1.1.0.tar.gz;
    $pkg_unpack libbar &cfg/libbar-1.1.0/***;

    $pkg_fetch -e $src/t4c/libbaz-1.1.0.tar.gz;
    $pkg_unpack libbaz &cfg/libbaz-1.1.0/***;

    mv cfg/libbar-1.1.0 libbar;
    mv cfg/libbaz-1.1.0 libbaz;

    rm -r cfg && $clone_root_cfg;    # Re-clone.
    $rep_add $rep/t4a && $rep_fetch;

    $* ./libbar/ 2>>~%EOE%;
      fetched libfoo/1.1.0
      unpacked libfoo/1.1.0
      using libbar/1.1.0 (external)
      configured libfoo/1.1.0
      configured libbar/1.1.0
      %info: .+ is up to date%
      updated libbar/1.1.0
      EOE

    $* ./libbaz/ 2>>~%EOE%;
      using libbaz/1.1.0 (external)
      configured libbaz/1.1.0
      %info: .+ is up to date%
      updated libbaz/1.1.0
      EOE

    $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
    $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

    $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
    $pkg_purge     libbar 2>'purged libbar/1.1.0';

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }

  : upgrade-all-held
  :
  {
    $clone_root_cfg && $rep_fetch $rep/t2 $rep/t5;

    $* libbar/1.0 2>>~%EOE%;
      fetched libfoo/1.0.0
      unpacked libfoo/1.0.0
      fetched libbar/1.0.0
      unpacked libbar/1.0.0
      configured libfoo/1.0.0
      configured libbar/1.0.0
      %info: .+ is up to date%
      updated libbar/1.0.0
      EOE

    $* --upgrade 2>>~%EOE%;
      disfigured libbar/1.0.0
      disfigured libfoo/1.0.0
      purged libfoo/1.0.0
      fetched libbar/1.2.0
      unpacked libbar/1.2.0
      configured libbar/1.2.0
      %info: .+ is up to date%
      updated libbar/1.2.0
      EOE

    $pkg_status libbar >'!libbar configured 1.2.0';

    # While at it, test using --mask-repository* instead of rep-remove.
    #
    $* --upgrade --mask-repository $rep/t2 --mask-repository $rep/t5 2>>/EOE != 0;
      error: libbar is not available
      EOE

    $* --upgrade --mask-repository-uuid "$cfg_uuid=($rep/t2)" \
                 --mask-repository-uuid "$cfg_uuid=($rep/t5)" 2>>/EOE != 0;
      error: libbar is not available
      EOE

    $rep_remove $rep/t2 $rep/t5;

    $* --upgrade 2>>/EOE != 0;
      error: libbar is not available
        info: configuration cfg/ has no repositories
        info: use 'bpkg rep-add' to add a repository
      EOE

    $pkg_drop libbar
  }

  : foo-baz-box-bar
  :
  : Test build scenarios described in
  : https://github.com/conan-io/conan/issues/9547.
  :
  if (!$remote)
  {
    +mkdir 1/

    # Repository state 0: initial (see the above t9 directory tree for details).

    # Repository state 1: libbar/2.0.0 is released.
    #
    r = 1/t9-1
    +cp -r $rep/t9 $r && \
     $tar xzf $r/libbar-1.0.0.tar.gz -C $r && \
     mv $r/libbar-1.0.0 $r/libbar-2.0.0 && \
     sed -i -e 's/(version:).+/\1 2.0.0/' $r/libbar-2.0.0/manifest && \
     $tar cfz $r/libbar-2.0.0.tar.gz -C $r libbar-2.0.0 &$r/libbar-2.0.0.tar.gz && \
     rm -r $r/libbar-2.0.0 && \
     $rep_create $r &$r/packages.manifest

    # Repository state 2: libbaz/2.0.0 is released, which depends on
    #                     libbar ^2.0.0.
    #
    r = 1/t9-2
    +cp -r 1/t9-1 $r && \
     $tar xzf $r/libbaz-1.0.0.tar.gz -C $r && \
     mv $r/libbaz-1.0.0 $r/libbaz-2.0.0 && \
     sed -i -e 's/(version:).+/\1 2.0.0/' -e 's/(depends: libbar).+/\1 ^2.0.0/' $r/libbaz-2.0.0/manifest && \
     $tar cfz $r/libbaz-2.0.0.tar.gz -C $r libbaz-2.0.0 &$r/libbaz-2.0.0.tar.gz && \
     rm -r $r/libbaz-2.0.0 && \
     $rep_create $r &$r/packages.manifest

    # Repository state 3: libbox/1.1.0 is released, which still depends on
    #                     libbar ^1.0.0.
    #
    r = 1/t9-3
    +cp -r 1/t9-2 $r && \
     $tar xzf $r/libbox-1.0.0.tar.gz -C $r && \
     mv $r/libbox-1.0.0 $r/libbox-1.1.0 && \
     sed -i -e 's/(version:).+/\1 1.1.0/' $r/libbox-1.1.0/manifest && \
     $tar cfz $r/libbox-1.1.0.tar.gz -C $r libbox-1.1.0 &$r/libbox-1.1.0.tar.gz && \
     rm -r $r/libbox-1.1.0 && \
     $rep_create $r &$r/packages.manifest

    : repo-state-1
    :
    {
      : build
      :
      {
        $clone_root_cfg;
        $rep_add ../../1/t9-1 && $rep_fetch;

        $* foo 2>!;
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $pkg_drop foo
      }

      : upgrade
      :
      : Test upgrade of packages (initially built from the repository state 0)
      : after the state 1 is fetched.
      :
      {
        $clone_root_cfg;

        mkdir 1/;
        ln -s $rep/t9 1/repo;
        $rep_add 1/repo && $rep_fetch;

        $* foo 2>!;
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0
          EOO

        rm 1/repo;
        ln -s ../../../1/t9-1 1/repo;

        $rep_fetch;

        $* foo 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $* ?libbar 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $* ?libbaz 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $pkg_drop foo
      }
    }

    : repo-state-2
    :
    {
      : build
      :
      {
        $clone_root_cfg;
        $rep_add ../../1/t9-2 && $rep_fetch;

        # Picks up the latest libbaz (2.0.0) as a prerequisite for foo, which
        # leads to the conflict between libbaz/2.0.0 and libbox/1.0.0 about
        # prerequisite libbar because of the incompatible version constraints.
        # This get automatically resolved by the unsatisfied constraints
        # resolution machinery.
        #
        $* foo --plan '' --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libbaz/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/2.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build: postpone failure for dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: collect_build: pick libbar/2.0.0 over libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent libbox/1.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace conflicting dependent libbaz/2.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace conflicting dependent version libbaz/2.0.0 with 1.0.0 by adding package spec '?libbaz == 1.0.0' to command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbaz/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbaz/1.0.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: end libbaz/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
            new libbar/1.0.0 (required by libbaz, libbox)
            new libbaz/1.0.0 (required by foo)
            new libbox/1.0.0 (required by foo)
            new foo/1.0.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $pkg_drop foo
      }

      : upgrade
      :
      : Test upgrade of packages (initially built from the repository state 0)
      : after the state 2 is fetched.
      :
      {
        $clone_root_cfg;

        mkdir 1/;
        ln -s $rep/t9 1/repo;
        $rep_add 1/repo && $rep_fetch;

        $* foo 2>!;
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0
          EOO

        rm 1/repo;
        ln -s ../../../1/t9-2 1/repo;

        $rep_fetch;

        $* foo 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $* ?libbar 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        # Initially unable to satisfy the dependent libbox with an upgraded
        # (due to libbaz 2.0.0) prerequisite libbar/2.0.0. But this get
        # automatically resolved by the unsatisfied constraints resolution
        # machinery.
        #
        $* ?libbaz --plan '' --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libbaz/1.0.0: update to libbaz/2.0.0
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval foo/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: end reached
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          info: package libbaz dependency on (libbar ^2.0.0) is forcing upgrade of libbar/1.0.0 to 2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: skip being built existing dependent libbaz of dependency libbar
          trace: collect_build_prerequisites: skip unsatisfied existing dependent libbox of dependency libbar/2.0.0 due to constraint (libbar ^1.0.0)
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_dependents: postpone failure for existing dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfiable dependent libbaz/2.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace unsatisfiable dependent version libbaz/2.0.0 with 1.0.0 by adding constraint '?libbaz' -> '?libbaz == 1.0.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $pkg_drop foo
      }
    }

    : repo-state-3
    :
    {
      : build
      :
      {
        $clone_root_cfg;
        $rep_add ../../1/t9-3 && $rep_fetch;

        # Similar to the repository state 2, picks up the latest libbaz
        # (2.0.0) as a prerequisite for foo, which leads to the conflict,
        # which is resolved automatically.
        #
        $* foo --plan '' --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libbaz/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/2.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_build: add libbox/1.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/1.1.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.1.0
          trace: collect_build: postpone failure for dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: collect_build: pick libbar/2.0.0 over libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbox/1.1.0
          trace: collect_build_prerequisites: end libbox/1.1.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent libbox/1.1.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace unsatisfied dependent version libbox/1.1.0 with 1.0.0 by adding package spec '?libbox == 1.0.0' to command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libbaz/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/2.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build: postpone failure for dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: collect_build: pick libbar/2.0.0 over libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent libbox/1.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replacement of unsatisfied dependent version libbox/1.0.0 is denied since it is specified on command line as '?libbox == 1.0.0'
          trace: try_replace_dependent: try to replace conflicting dependent libbaz/2.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace conflicting dependent version libbaz/2.0.0 with 1.0.0 by adding package spec '?libbaz == 1.0.0' to command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbaz/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbaz/1.0.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: end libbaz/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: start command line adjustments refinement cycle by rolling back first adjustment ('?libbox == 1.0.0')
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.0.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbaz/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbaz/1.0.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: end libbaz/1.0.0
          trace: collect_build: add libbox/1.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/1.1.0 of dependent foo/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbox/1.1.0
          trace: collect_build_prerequisites: end libbox/1.1.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: command line adjustment '?libbox == 1.0.0' is redundant, dropping it
            new libbar/1.0.0 (required by libbaz, libbox)
            new libbaz/1.0.0 (required by foo)
            new libbox/1.1.0 (required by foo)
            new foo/1.0.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.1.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $pkg_drop foo
      }

      : upgrade
      :
      : Test upgrade of packages (initially built from the repository state 0)
      : after the state 3 is fetched.
      :
      {
        $clone_root_cfg;

        mkdir 1/;
        ln -s $rep/t9 1/repo;
        $rep_add 1/repo && $rep_fetch;

        $* foo 2>!;
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0
              libbar configured 1.0.0
            libbox configured 1.0.0
              libbar configured 1.0.0
          EOO

        rm 1/repo;
        ln -s ../../../1/t9-3 1/repo;

        $rep_fetch;

        $* foo 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0 available 1.1.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $* ?libbar 2>!; # Noop.
        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0 available 1.1.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        test.arguments += --plan '' --verbose 5;

        # Initially, unable to satisfy the dependent libbox with an upgraded
        # (due to libbaz 2.0.0) prerequisite libbar/2.0.0. But this get
        # automatically resolved by the unsatisfied constraints resolution
        # machinery.
        #
        $* foo ?libbaz 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: skip configured foo/1.0.0
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libbaz/1.0.0: update to libbaz/2.0.0
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval foo/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: end reached
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          info: package libbaz dependency on (libbar ^2.0.0) is forcing upgrade of libbar/1.0.0 to 2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: skip being built existing dependent libbaz of dependency libbar
          trace: collect_build_prerequisites: skip unsatisfied existing dependent libbox of dependency libbar/2.0.0 due to constraint (libbar ^1.0.0)
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_dependents: postpone failure for existing dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfiable dependent libbaz/2.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace unsatisfiable dependent version libbaz/2.0.0 with 1.0.0 by adding constraint '?libbaz' -> '?libbaz == 1.0.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: skip configured foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
            update foo/1.0.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.0.0 available 1.1.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        # libbar/2.0.0 is still unsatisfactory, initially, as a prerequisite
        # for libbox, even after libbox upgrade is requested on the command
        # line. This get automatically resolved by the unsatisfied constraints
        # resolution machinery.
        #
        $* foo ?libbaz ?libbox 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: skip configured foo/1.0.0
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libbaz/1.0.0: update to libbaz/2.0.0
          trace: evaluate_dependency: libbox/1.0.0: update to libbox/1.1.0
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval foo/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: end reached
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          info: package libbaz dependency on (libbar ^2.0.0) is forcing upgrade of libbar/1.0.0 to 2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: skip being built existing dependent libbaz of dependency libbar
          trace: collect_build_prerequisites: skip unsatisfied existing dependent libbox of dependency libbar/2.0.0 due to constraint (libbar ^1.0.0)
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_build_prerequisites: pre-reeval foo/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: end reached
          trace: collect_build_prerequisites: begin libbox/1.1.0
          trace: collect_build: postpone failure for dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: collect_build: pick libbar/2.0.0 over libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbox/1.1.0
          trace: collect_build_prerequisites: end libbox/1.1.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent libbox/1.1.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace unsatisfied dependent version libbox/1.1.0 with 1.0.0 by adding constraint '?libbox' -> '?libbox == 1.0.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: skip configured foo/1.0.0
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libbaz/1.0.0: update to libbaz/2.0.0
          %.*
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval foo/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: end reached
          trace: collect_build_prerequisites: begin libbaz/2.0.0
          trace: collect_build: add libbar/2.0.0
          info: package libbaz dependency on (libbar ^2.0.0) is forcing upgrade of libbar/1.0.0 to 2.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.0.0 of dependent libbaz/2.0.0
          trace: collect_build_prerequisites: skip being built existing dependent libbaz of dependency libbar
          trace: collect_build_prerequisites: skip unsatisfied existing dependent libbox of dependency libbar/2.0.0 due to constraint (libbar ^1.0.0)
          trace: collect_build_prerequisites: begin libbar/2.0.0
          trace: collect_build_prerequisites: end libbar/2.0.0
          trace: collect_build_prerequisites: end libbaz/2.0.0
          trace: collect_dependents: postpone failure for existing dependent libbox unsatisfied with dependency libbar/2.0.0 (^1.0.0)
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/2.0.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfiable dependent libbaz/2.0.0 of dependency libbar/2.0.0 with some other version
          trace: try_replace_dependency: replace unsatisfiable dependent version libbaz/2.0.0 with 1.0.0 by adding constraint '?libbaz' -> '?libbaz == 1.0.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: skip configured foo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: start command line adjustments refinement cycle by rolling back first adjustment ('?libbox' -> '?libbox == 1.0.0')
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: skip configured foo/1.0.0
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libbaz/1.0.0: unchanged
          trace: evaluate_dependency: libbox/1.0.0: update to libbox/1.1.0
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval foo/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: end reached
          trace: collect_build_prerequisites: begin libbox/1.1.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbox/1.1.0
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_prerequisites: end libbox/1.1.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: command line adjustment '?libbox' -> '?libbox == 1.0.0' is redundant, dropping it
            upgrade libbox/1.1.0
            reconfigure/update foo/1.0.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libbaz configured 1.0.0 available 2.0.0
              libbar configured 1.0.0 available 2.0.0
            libbox configured 1.1.0
              libbar configured 1.0.0 available 2.0.0
          EOO

        $pkg_drop foo
      }
    }
  }

  : config-vars
  :
  {
    +$cfg_create -d cfg cc config.cc.coptions=-Wall 2>- &cfg/***
    +$rep_add $rep/t5 && $rep_fetch

    : override-package-specific
    :
    {
      $clone_cfg;

      $* --configure-only { config.cc.coptions+=-g }+ libbar \
                          { config.cc.coptions+=-O }+ libbox 2>>EOE;
        fetched libbar/1.2.0
        unpacked libbar/1.2.0
        fetched libbox/1.2.0
        unpacked libbox/1.2.0
        configured libbar/1.2.0
        configured libbox/1.2.0
        EOE

      cat cfg/build/config.build >>~%EOO%;
        %.*
        config.cc.coptions = -Wall
        %.*
        EOO

      cat cfg/libbar-1.2.0/build/config.build >>~%EOO%;
        %.*
        config.cc.coptions = -Wall -g
        %.*
        EOO

      cat cfg/libbox-1.2.0/build/config.build >>~%EOO%;
        %.*
        config.cc.coptions = -Wall -O
        %.*
        EOO

      $pkg_drop libbar libbox
    }

    : override-globally
    :
    {
      $clone_cfg;

      $* --configure-only config.cc.coptions+=-g \
                          config.cc.coptions+=-O -- libbar 2>>EOE;
        fetched libbar/1.2.0
        unpacked libbar/1.2.0
        configured libbar/1.2.0
        EOE

      cat cfg/build/config.build >>~%EOO%;
        %.*
        config.cc.coptions = -Wall
        %.*
        EOO

      cat cfg/libbar-1.2.0/build/config.build >>~%EOO%;
        %.*
        config.cc.coptions = -Wall -g -O
        %.*
        EOO

      $pkg_drop libbar
    }
  }
}

: dependency
:
{
  : upgrade-diag
  :
  {
    +$clone_root_cfg && $rep_fetch $rep/t1

    : warning
    :
    {
      $clone_cfg;

      $* libfoo 2>!;
      $rep_fetch $rep/t4b;

      $* libbar --yes 2>>~%EOE%;
        warning: package libbar dependency on (libfoo == 1.1.0) is forcing upgrade of libfoo/1.0.0 to 1.1.0
        disfigured libfoo/1.0.0
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        configured libfoo/1.1.0
        configured libbar/1.1.0
        %info: .+ is up to date%
        updated libbar/1.1.0
        EOE

      $pkg_drop libbar libfoo
    }

    : error
    :
    {
      $clone_cfg;

      $* libfoo/1.0.0 2>!;
      $rep_fetch $rep/t4b;

      $* libbar 2>>EOE != 0;
        error: package libbar dependency on (libfoo == 1.1.0) is forcing upgrade of libfoo/1.0.0 to 1.1.0
          info: package version libfoo/1.0.0 is held
          info: explicitly request version upgrade to continue
        info: while satisfying libbar/1.1.0
        EOE

      $pkg_drop libfoo
    }

    : info
    :
    {
      $clone_cfg && $rep_fetch $rep/t2;

      $* libbar --yes 2>!;
      $rep_fetch $rep/t4b;

      $* -v libbar --yes 2>>~%EOE%;
        info: package libbar dependency on (libfoo == 1.1.0) is forcing upgrade of libfoo/1.0.0 to 1.1.0
        %.*
        EOE

      $pkg_drop libbar
    }

    : none
    :
    {
      $clone_cfg && $rep_fetch $rep/t2;

      $* libbar --yes 2>!;
      $rep_fetch $rep/t4b;

      $* libbar --yes 2>>~%EOE%;
        disfigured libbar/1.0.0
        disfigured libfoo/1.0.0
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        configured libfoo/1.1.0
        configured libbar/1.1.0
        %info: .+ is up to date%
        updated libbar/1.1.0
        EOE

      $pkg_drop libbar
    }
  }

  : unknown
  :
  {
    $clone_root_cfg;
    $rep_fetch $rep/t0c;

    $* '?libbux'      2>'error: unknown package libbux' != 0;
    $* '?sys:libbux'  2>>EOE != 0;
      error: unknown package sys:libbux
        info: consider specifying sys:libbux/*
      EOE
    $* '?libbar/1.3'  2>'error: unknown package libbar/1.3' != 0;
    $* '?libbar[5 7]' 2>"error: unknown package 'libbar [5 7]'" != 0
  }

  : constraint
  :
  {
    $clone_root_cfg;
    $rep_fetch $rep/t0c;

    # Constraint the dependency version.
    #
    $* libbox '?libbaz < 0.1.0' 2>>~%EOE%;
      fetched libbaz/0.0.4
      unpacked libbaz/0.0.4
      fetched libbox/0.0.1
      unpacked libbox/0.0.1
      configured libbaz/0.0.4
      configured libbox/0.0.1
      %info: .+libbox.+ is up to date%
      updated libbox/0.0.1
      EOE

    $pkg_status libbaz >'libbaz configured !0.0.4 available 0.1.0';

    # The selected dependency libbaz/0.0.4 satisfies the constraint, thus it
    # is not upgraded.
    #
    $* '?libbaz < 1.0.0';

    $pkg_status libbaz >'libbaz configured !0.0.4 available 0.1.0';

    # Upgrade the dependency.
    #
    $* '?libbaz > 0.0.4' --yes 2>>~%EOE%;
      disfigured libbox/0.0.1
      disfigured libbaz/0.0.4
      fetched libbaz/0.1.0
      unpacked libbaz/0.1.0
      configured libbaz/0.1.0
      configured libbox/0.0.1
      %info: .+libbox.+ is up to date%
      updated libbox/0.0.1
      EOE

    $pkg_status libbaz >'libbaz configured !0.1.0';

    $pkg_drop libbox
  }

  : system-no-repo
  :
  {
    $clone_root_cfg;

    cp -r $src/libfoo-1.1.0 libfoo;
    echo 'depends: libhello >= 1.0' >+libfoo/manifest;
    $rep_add libfoo --type dir;

    $rep_fetch;

    $* libfoo 2>>~%EOE% != 0;
      error: no package available for dependency libhello of package libfoo
      %.+
      EOE

    $* libfoo '?sys:libhello' 2>>EOE != 0;
      error: unknown package sys:libhello
        info: consider specifying sys:libhello/*
      EOE

    $* "sys:libhello/2.0@$rep/t0a" --trust-yes 2>>~%EOE% != 0;
      %.+
      %error: package sys:libhello/2\.0 is not found in .+t0a%
      EOE

    $* libfoo '?sys:libhello/0.1' 2>>EOE != 0;
      error: unable to satisfy constraints on package libhello
        info: libfoo depends on (libhello >= 1.0)
        info: command line depends on (libhello == 0.1)
        info: specify libhello version to satisfy libfoo constraint
      info: while satisfying libfoo/1.1.0
      EOE

    $* libfoo '?sys:libhello/*' 2>>~%EOE%;
      using libfoo/1.1.0 (external)
      configured sys:libhello/*
      configured libfoo/1.1.0
      %info: .+ is up to date%
      updated libfoo/1.1.0
      EOE

    $pkg_status libhello >'libhello configured,system !*';

    $* '?sys:libhello/2.0' --yes 2>>~%EOE%;
      disfigured libfoo/1.1.0
      purged libhello/*
      configured sys:libhello/2.0
      configured libfoo/1.1.0
      %info: .+ is up to date%
      updated libfoo/1.1.0
      EOE

    $pkg_status libhello >'libhello configured,system !2.0';

    $pkg_drop libfoo
  }

  : unused
  :
  {
    test.arguments += --configure-only

    +$clone_root_cfg
    +$rep_fetch $rep/t2 $rep/t5

    : drop
    :
    : Test dropping of unused dependencies (default behavior).
    :
    {
      $clone_cfg;

      # Here we also test that specifying unknown but unused system
      # dependencies.
      #
      $* --yes libbar/1.0.0 '?sys:libbox/*' '?sys:libbux/1' 2>>EOE;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured libfoo/1.0.0
        configured libbar/1.0.0
        EOE

      $* libbar/1.2.0 <'y' 2>>EOE;
          drop libfoo/1.0.0 (unused)
          upgrade libbar/1.2.0
        continue? [Y/n] disfigured libbar/1.0.0
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbar/1.2.0
        unpacked libbar/1.2.0
        configured libbar/1.2.0
        EOE

      $pkg_status libfoo >'libfoo available 1.0.0 0.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.2.0';
      $pkg_purge     libbar 2>'purged libbar/1.2.0'
    }

    : keep
    :
    : Test keeping of unused dependencies (--keep-unused option).
    :
    {
      $clone_cfg;

      $* --yes libbar/1.0.0 2>>EOE;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured libfoo/1.0.0
        configured libbar/1.0.0
        EOE

      $* --keep-unused libbar/1.2.0 <'y' 2>>EOE;
          upgrade libbar/1.2.0
        continue? [Y/n] disfigured libbar/1.0.0
        fetched libbar/1.2.0
        unpacked libbar/1.2.0
        configured libbar/1.2.0
        EOE

      $pkg_status libfoo >'libfoo configured 1.0.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.2.0';
      $pkg_purge     libbar 2>'purged libbar/1.2.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
    }

    : order-drop
    :
    {
      test.arguments += --yes

      $clone_root_cfg;
      $rep_fetch $rep/t2 $rep/t3;

      $* libbaz libbar 2>!;

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
          libfoo configured 1.0.0
        !libbaz configured 1.0.0
          !libbar configured 1.0.0
            libfoo configured 1.0.0
        EOO

      $* ?libbaz ?libfoo/0.1.0 2>>EOE;
        disfigured libbaz/1.0.0
        disfigured libbar/1.0.0
        disfigured libfoo/1.0.0
        fetched libfoo/0.1.0
        unpacked libfoo/0.1.0
        purged libbaz/1.0.0
        configured libfoo/0.1.0
        configured libbar/1.0.0
        EOE

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
          libfoo configured !0.1.0 available 1.0.0
        EOO

      $pkg_drop libbar
    }

    : drop-recursive
    :
    {
      test.arguments += --yes

      $clone_root_cfg;
      $rep_fetch $rep/t0a $rep/t0c;

      $* libbar/0.0.1 2>!;

      $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3';
      $pkg_status libfox >'libfox configured 0.0.1';

      $* libbar 2>>EOE;
        disfigured libbar/0.0.1
        disfigured libbaz/0.0.1
        disfigured libfox/0.0.1
        purged libfox/0.0.1
        purged libbaz/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured libfoo/1.0.0
        configured libbar/1.0.0
        EOE

      $pkg_status libbaz >'libbaz available 0.1.0 0.0.4 0.0.3 0.0.1';
      $pkg_status libfox >'libfox available 0.0.1';

      $pkg_drop libbar
    }

    : drop-unsatisfactory
    :
    : Test that a dependency (libbaz/0.0.3) that doesn't satisfy its dependent
    : (libbar/0.0.1) but get dropped during the plan refinement, doesn't
    : prevent the command to succeed.
    :
    {
      test.arguments += --yes

      $clone_root_cfg;
      $rep_fetch $rep/t0a $rep/t0c;

      $* libbar/0.0.1 2>!;

      $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3';
      $pkg_status libfox >'libfox configured 0.0.1';

      $* ?libbar ?libbaz/0.0.3 2>>EOE;
        disfigured libbar/0.0.1
        disfigured libbaz/0.0.1
        disfigured libfox/0.0.1
        purged libfox/0.0.1
        purged libbaz/0.0.1
        purged libbar/0.0.1
        EOE

      $pkg_status libbar >'libbar available 1.0.0 0.0.3 0.0.1';
      $pkg_status libbaz >'libbaz available 0.1.0 0.0.4 0.0.3 0.0.1';
      $pkg_status libfox >'libfox available 0.0.1'
    }
  }

  : apply-constraints
  :
  : Test that the desired dependency version imposes constraint that is taken
  : into account during prerequisites collection (see collect_prerequisites()
  : for more details).
  :
  {
    test.arguments += --yes --configure-only

    : unable-satisfy
    :
    {
      $clone_root_cfg;
      $rep_fetch $rep/t0a $rep/t0b;

      # Note that before we have implemented the unsatisfied constraints
      # resolution this command has failed as follows:
      #
      # error: unable to satisfy constraints on package libbaz
      #   info: libbar depends on (libbaz == 0.0.1)
      #           command line requires (libbar == 0.0.1)
      #   info: command line depends on (libbaz == 0.0.2)
      #   info: specify libbaz version to satisfy libbar constraint
      # info: while satisfying libbar/0.0.1
      #
      $* libbar/0.0.1 ?libbaz/0.0.2 2>>EOE != 0;
        error: libbaz/0.0.2 is not available from its dependents' repositories
        EOE

      # Note that before we have implemented the unsatisfied constraints
      # resolution this command has failed as follows:
      #
      # error: unable to satisfy constraints on package libbaz
      #   info: libbar depends on (libbaz == 0.0.1)
      #           command line requires (libbar == 0.0.1)
      #   info: command line depends on (libbaz >= 0.0.2)
      #   info: specify libbaz version to satisfy libbar constraint
      # info: while satisfying libbar/0.0.1
      #
      $* -- libbar/0.0.1 '?libbaz>=0.0.2' 2>>EOE != 0
        error: package libbaz doesn't satisfy its dependents
          info: libbaz/0.0.3 doesn't satisfy libbar/0.0.1
        EOE
    }

    : resolve-conflict
    :
    {
      : satisfy-dependents
      :
      : Test resolving a conflict when libfix and libbiz have selected such
      : versions of their dependency libbaz, that don't satisfy each other
      : constraints. We resolve the conflict automatically as if by specifying
      : ?libbaz/0.0.3 on the command line, which satisfies both constraints.
      :
      {
        $clone_root_cfg;
        $rep_fetch $rep/t0b $rep/t0c;

        $* libfix libbiz --plan '' --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libfix/0.0.3
          trace: collect_build: add libbiz/0.0.2
          trace: collect_build_prerequisites: begin libfix/0.0.3
          trace: collect_build: add libbaz/0.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.1.0 of dependent libfix/0.0.3
          trace: collect_build_prerequisites: begin libbaz/0.1.0
          trace: collect_build_prerequisites: end libbaz/0.1.0
          trace: collect_build_prerequisites: end libfix/0.0.3
          trace: collect_build_prerequisites: begin libbiz/0.0.2
          trace: collect_build: postpone failure for dependent libbiz unsatisfied with dependency libbaz/0.1.0 (<= 0.0.3)
          trace: collect_build: pick libbaz/0.1.0 over libbaz/0.0.2
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.1.0 of dependent libbiz/0.0.2
          trace: collect_build_prerequisites: end libbiz/0.0.2
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbaz/0.1.0 with some other version
          trace: try_replace_dependency: replace unsatisfactory dependency version libbaz/0.1.0 with 0.0.3 by adding package spec '?libbaz == 0.0.3' to command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libfix/0.0.3
          trace: collect_build: add libbiz/0.0.2
          trace: collect_build_prerequisites: begin libfix/0.0.3
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.0.3 of dependent libfix/0.0.3
          trace: collect_build_prerequisites: begin libbaz/0.0.3
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent libbaz/0.0.3
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end libbaz/0.0.3
          trace: collect_build_prerequisites: end libfix/0.0.3
          trace: collect_build_prerequisites: begin libbiz/0.0.2
          trace: collect_build: pick libbaz/0.0.3 over libbaz/0.0.2
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.0.3 of dependent libbiz/0.0.2
          trace: collect_build_prerequisites: end libbiz/0.0.2
          trace: execute_plan: simulate: yes
          %.*
            new libfoo/1.0.0 (required by libbaz)
            new libbaz/0.0.3 (required by libbiz, libfix)
            new libfix/0.0.3
            new libbiz/0.0.2
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.3 available 0.1.0 0.0.4';

        $pkg_drop libbiz libfix
      }

      : postpone
      :
      : Same as above but with an opposite order of dependents on the command
      : line. This would normally fail due the inability to find libbaz/0.0.3
      : in repositories available to libbiz, unless libbaz dependencies
      : collection were not postponed (see collect_build_prerequisites()
      : function for more details).
      :
      {
        $clone_root_cfg;
        $rep_fetch $rep/t0b $rep/t0c;

        $* libbiz libfix ?libbaz/0.0.3 2>>EOE;
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbaz/0.0.3
          unpacked libbaz/0.0.3
          fetched libbiz/0.0.2
          unpacked libbiz/0.0.2
          fetched libfix/0.0.3
          unpacked libfix/0.0.3
          configured libfoo/1.0.0
          configured libbaz/0.0.3
          configured libbiz/0.0.2
          configured libfix/0.0.3
          EOE

        $pkg_status libbaz >'libbaz configured !0.0.3 available 0.1.0 0.0.4';

        $pkg_drop libbiz libfix
      }

      : replace-dependent
      :
      : Test resolving a conflict when libbox and libfox have selected such
      : versions of their dependency libfoo, that do not satisfy each other
      : constraints. Note that these constraints are incompatible, so we
      : automatically resolve the conflict by implicitly specifying
      : ?libfox/0.0.1 on the command line, to replace one of the conflicting
      : dependents.
      :
      {
        $clone_root_cfg;
        $rep_fetch $rep/t0d;

        $* libbiz --plan "" --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libbiz/0.0.1
          trace: collect_build_prerequisites: begin libbiz/0.0.1
          trace: collect_build: add libfox/0.0.2
          trace: collect_build_prerequisites: no cfg-clause for dependency libfox/0.0.2 of dependent libbiz/0.0.1
          trace: collect_build_prerequisites: begin libfox/0.0.2
          trace: collect_build: add libfoo/0.0.1
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/0.0.1 of dependent libfox/0.0.2
          trace: collect_build_prerequisites: begin libfoo/0.0.1
          trace: collect_build: add libfix/0.0.1
          trace: collect_build_prerequisites: no cfg-clause for dependency libfix/0.0.1 of dependent libfoo/0.0.1
          trace: collect_build_prerequisites: begin libfix/0.0.1
          trace: collect_build_prerequisites: end libfix/0.0.1
          trace: collect_build_prerequisites: end libfoo/0.0.1
          trace: collect_build_prerequisites: end libfox/0.0.2
          trace: collect_build: add libbox/0.0.2
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/0.0.2 of dependent libbiz/0.0.1
          trace: collect_build_prerequisites: begin libbox/0.0.2
          trace: collect_build: postpone failure for dependent libbox unsatisfied with dependency libfoo/0.0.1 (== 1.0.0)
          trace: collect_build: pick libfoo/0.0.1 over libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/0.0.1 of dependent libbox/0.0.2
          trace: collect_build_prerequisites: end libbox/0.0.2
          trace: collect_build_prerequisites: end libbiz/0.0.1
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libfoo/0.0.1 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent libbox/0.0.2 of dependency libfoo/0.0.1 with some other version
          trace: try_replace_dependent: try to replace conflicting dependent libfox/0.0.2 of dependency libfoo/0.0.1 with some other version
          trace: try_replace_dependency: replace conflicting dependent version libfox/0.0.2 with 0.0.1 by adding package spec '?libfox == 0.0.1' to command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libbiz/0.0.1
          trace: collect_build_prerequisites: begin libbiz/0.0.1
          trace: collect_build_prerequisites: no cfg-clause for dependency libfox/0.0.1 of dependent libbiz/0.0.1
          trace: collect_build_prerequisites: begin libfox/0.0.1
          trace: collect_build_prerequisites: end libfox/0.0.1
          trace: collect_build: add libbox/0.0.2
          trace: collect_build_prerequisites: no cfg-clause for dependency libbox/0.0.2 of dependent libbiz/0.0.1
          trace: collect_build_prerequisites: begin libbox/0.0.2
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent libbox/0.0.2
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end libbox/0.0.2
          trace: collect_build_prerequisites: end libbiz/0.0.1
          trace: execute_plan: simulate: yes
          %.*
            new libfox/0.0.1 (required by libbiz)
            new libfoo/1.0.0 (required by libbox)
            new libbox/0.0.2 (required by libbiz)
            new libbiz/0.0.1
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status libfox >'libfox configured 0.0.1 available 0.0.2';

        $pkg_drop libbiz
      }
    }

    : selected
    :
    : Test cases when the selected package (partially) satisfies the
    : user-imposed dependency constraint.
    :
    {
      +$clone_root_cfg
      +$rep_fetch $rep/t0a $rep/t0b $rep/t0c

      : same
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 2>!;
        $* libbar/0.0.2 ?libbaz/0.0.1 2>!;

        $pkg_status libbaz >'libbaz configured !0.0.1 available 0.1.0 0.0.4 0.0.3 0.0.2';
        $pkg_status libfox >'libfox configured 0.0.1';

        $pkg_drop libbar
      }

      : same-constraint
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 2>!;
        $* libbar/0.0.2 '?libbaz<0.0.2' 2>!;

        $pkg_status libbaz >'libbaz configured !0.0.1 available 0.1.0 0.0.4 0.0.3 0.0.2';
        $pkg_status libfox >'libfox configured 0.0.1';

        $pkg_drop libbar
      }

      : src-to-sys
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 2>!;
        $* libbar/0.0.2 '?sys:libbaz/0.0.1' 2>!;

        $pkg_status libbaz >'libbaz configured,system !0.0.1 available 0.1.0 0.0.4 0.0.3 0.0.2';
        $pkg_status libfox >'libfox available 0.0.1';

        $pkg_drop libbar
      }

      : sysver-to-wildcard
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?sys:libbaz/0.0.1' 2>!;
        $* libbar/0.0.2 '?sys:libbaz' 2>!;

        $pkg_status libbaz >'libbaz configured,system !* available 0.1.0 0.0.4 0.0.3 0.0.2 0.0.1';

        $pkg_drop libbar
      }

      : wildcard-to-sysver
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?sys:libbaz' 2>!;
        $* libbar/0.0.2 '?sys:libbaz/0.0.1' 2>!;

        $pkg_status libbaz >'libbaz configured,system !0.0.1 available 0.1.0 0.0.4 0.0.3 0.0.2';

        $pkg_drop libbar
      }
    }

    : unknown
    :
    {
      $clone_root_cfg;
      $rep_fetch $rep/t0a $rep/t0c;

      $* libbar/1.0.0 ?libfoo/0.0.1 2>>EOE != 0
        error: unable to satisfy dependency constraint (libfoo == 0.0.1) of package libbar
          info: available libfoo versions: 1.0.0
        info: while satisfying libbar/1.0.0
        EOE
    }
  }

  : reconfigure
  :
  {
    test.arguments += --yes --configure-only

    +$clone_root_cfg
    +$rep_fetch $rep/t8a

    : deps-with-buildfile-clause
    :
    {
      $clone_cfg;

      $* dox 2>!;

      $pkg_status -r >>EOO;
        !dox configured 1.0.0
          dax configured 1.0.0
            libbaz configured 1.1.0
        EOO

      $* ?dax; # Noop.

      $* { config.dax.extras=true }+ ?dax 2>>EOE;
        disfigured dox/1.0.0
        disfigured dax/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured libbar/1.0.0
        configured dax/1.0.0
        configured dox/1.0.0
        EOE

      cat cfg/dax-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.dax.extras = true
        %.*
        EOO

      $* ?dax; # Noop.

      cat cfg/dax-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.dax.extras = true
        %.*
        EOO

      $pkg_status -r >>EOO;
        !dox configured 1.0.0
          dax configured 1.0.0
            libbar configured 1.0.0
            libbaz configured 1.1.0
        EOO

      $* { config.dax.extras=true }+ ?dax 2>>EOE;
        disfigured dox/1.0.0
        disfigured dax/1.0.0
        configured dax/1.0.0
        configured dox/1.0.0
        EOE

      $pkg_status -r >>EOO;
        !dox configured 1.0.0
          dax configured 1.0.0
            libbar configured 1.0.0
            libbaz configured 1.1.0
        EOO

      $* { config.dax.extras=false }+ ?dax 2>>EOE;
        disfigured dox/1.0.0
        disfigured dax/1.0.0
        disfigured libbar/1.0.0
        purged libbar/1.0.0
        configured dax/1.0.0
        configured dox/1.0.0
        EOE

      cat cfg/dax-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.dax.extras = false
        %.*
        EOO

      $pkg_status -r >>EOO;
        !dox configured 1.0.0
          dax configured 1.0.0
            libbaz configured 1.1.0
        EOO

      # While at it, test that an attempt to reconfigure an orphan dependency
      # which has its own dependencies with buildfile clauses fails.
      #
      $rep_remove $rep/t8a;

      $* { config.dax.extras=true }+ ?dax 2>>/EOE != 0;
        error: unknown package dax
          info: configuration cfg/ has no repositories
          info: use 'bpkg rep-add' to add a repository
        EOE

      cp -rp cfg/dax-1.0.0/ dax;

      $rep_add --type dir "$~/dax";
      $rep_fetch;

      $* { config.dax.extras=true }+ ?dax 2>>EOE != 0;
        error: package dax/1.0.0 is orphaned
          info: explicitly upgrade it to a new version
        info: while satisfying dax/1.0.0
        EOE

      $pkg_drop dox
    }

    : deps-without-buildfile-clause
    :
    {
      $clone_cfg;

      $* foz 2>!;

      $pkg_status -r >>EOO;
        !foz configured 1.0.0
          fuz configured 1.0.0
            libfoo configured 2.0.0
        EOO

      $* ?fuz; # Noop.

      cat cfg/fuz-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.fuz.extras = false
        %.*
        EOO

      $* { config.fuz.extras=true }+ ?fuz 2>>EOE;
        disfigured foz/1.0.0
        disfigured fuz/1.0.0
        configured fuz/1.0.0
        configured foz/1.0.0
        EOE

      cat cfg/fuz-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.fuz.extras = true
        %.*
        EOO

      $* ?fuz; # Noop.

      cat cfg/fuz-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.fuz.extras = true
        %.*
        EOO

      $* { config.fuz.extras=false }+ ?fuz 2>>EOE;
        disfigured foz/1.0.0
        disfigured fuz/1.0.0
        configured fuz/1.0.0
        configured foz/1.0.0
        EOE

      cat cfg/fuz-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.fuz.extras = false
        %.*
        EOO

      # While at it, test that we can also reconfigure an orphan with its own
      # dependencies but without buildfile clauses.
      #
      $rep_remove $rep/t8a;

      cp -rp cfg/fuz-1.0.0/ fuz;
      sed -i -e 's/(version:) 1.0.0/\1 2.0.0/' fuz/manifest;

      $rep_add --type dir "$~/fuz";
      $rep_fetch;

      $* { config.fuz.extras=true }+ ?fuz 2>>EOE;
        disfigured foz/1.0.0
        disfigured fuz/1.0.0
        configured fuz/1.0.0
        configured foz/1.0.0
        EOE

      cat cfg/fuz-1.0.0/build/config.build >>~%EOO%;
        %.*
        config.fuz.extras = true
        %.*
        EOO

      $pkg_status -r >>EOO;
        !foz configured 1.0.0
          fuz configured 1.0.0 available 2.0.0
            libfoo configured 2.0.0
        EOO

      $pkg_drop foz
    }

    : no-deps
    :
    {
      $clone_cfg;

      $* fuz 2>!;

      $* ?libfoo; # Noop.

      cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
        %.*
        config.libfoo.protocol = 2
        %.*
        EOO

      $* { config.libfoo.protocol=1 }+ ?libfoo 2>>EOE;
        disfigured fuz/1.0.0
        disfigured libfoo/2.0.0
        configured libfoo/2.0.0
        configured fuz/1.0.0
        EOE

      cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
        %.*
        config.libfoo.protocol = 1
        %.*
        EOO

      $* ?libfoo; # Noop.

      # While at it, test that we can also reconfigure an orphan without
      # dependencies.
      #
      $rep_remove $rep/t8a;

      cp -rp cfg/libfoo-2.0.0/ libfoo;
      sed -i -e 's/(version:) 2.0.0/\1 3.0.0/' libfoo/manifest;

      $rep_add --type dir "$~/libfoo";
      $rep_fetch;

      $* { config.libfoo.protocol=3 }+ ?libfoo 2>>EOE;
        disfigured fuz/1.0.0
        disfigured libfoo/2.0.0
        configured libfoo/2.0.0
        configured fuz/1.0.0
        EOE

      cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
        %.*
        config.libfoo.protocol = 3
        %.*
        EOO

      $pkg_drop fuz
    }
  }

  : refine
  :
  {
    test.arguments += --yes --configure-only

    +$clone_root_cfg
    +$rep_fetch $rep/t0a $rep/t0c

    : system
    :
    {
      +$clone_cfg

      : wildcard-to-version
      :
      {
        $clone_cfg;

        $* libbar '?sys:libfoo' 2>>EOE;
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured sys:libfoo/*
          configured libbar/1.0.0
          EOE

        $* '?sys:libfoo/0.1' 2>>EOE;
          disfigured libbar/1.0.0
          purged libfoo/*
          configured sys:libfoo/0.1
          configured libbar/1.0.0
          EOE

        $pkg_drop libbar
      }

      : wildcard-to-itself
      :
      {
        $clone_cfg;

        $* libbar '?sys:libfoo' 2>>EOE;
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured sys:libfoo/*
          configured libbar/1.0.0
          EOE

        $* '?sys:libfoo';

        $pkg_drop libbar
      }

      : wildcard-to-src
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?sys:libbaz' 2>>EOE;
          fetched libbar/0.0.1
          unpacked libbar/0.0.1
          configured sys:libbaz/*
          configured libbar/0.0.1
          EOE

        $* '?libbaz' 2>>EOE;
          disfigured libbar/0.0.1
          purged libbaz/*
          fetched libfox/0.0.1
          unpacked libfox/0.0.1
          fetched libbaz/0.0.1
          unpacked libbaz/0.0.1
          configured libfox/0.0.1
          configured libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $pkg_drop libbar
      }

      : version-to-wildcard
      :
      {
        $clone_cfg;

        $* libbar '?sys:libfoo/0.1' 2>>EOE;
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured sys:libfoo/0.1
          configured libbar/1.0.0
          EOE

        $* '?sys:libfoo' 2>>EOE;
          disfigured libbar/1.0.0
          purged libfoo/0.1
          configured sys:libfoo/*
          configured libbar/1.0.0
          EOE

        $pkg_drop libbar
      }

      : version-to-itself
      :
      {
        $clone_cfg;

        $* libbar '?sys:libfoo/0.1' 2>>EOE;
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured sys:libfoo/0.1
          configured libbar/1.0.0
          EOE

        $* '?sys:libfoo/0.1';

        $pkg_drop libbar
      }

      : version-to-version
      :
      {
        $clone_cfg;

        $* libbar '?sys:libfoo/0.2' 2>>EOE;
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured sys:libfoo/0.2
          configured libbar/1.0.0
          EOE

        $* '?sys:libfoo/0.1' 2>>EOE;
          disfigured libbar/1.0.0
          purged libfoo/0.2
          configured sys:libfoo/0.1
          configured libbar/1.0.0
          EOE

        $pkg_drop libbar
      }

      : version-to-src
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?sys:libbaz/0.0.1' 2>>EOE;
          fetched libbar/0.0.1
          unpacked libbar/0.0.1
          configured sys:libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $* '?libbaz/0.0.1' 2>>EOE;
          disfigured libbar/0.0.1
          purged libbaz/0.0.1
          fetched libfox/0.0.1
          unpacked libfox/0.0.1
          fetched libbaz/0.0.1
          unpacked libbaz/0.0.1
          configured libfox/0.0.1
          configured libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $pkg_drop libbar
      }

      : version-to-constraint
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?sys:libbaz/0.0.1' 2>>EOE;
          fetched libbar/0.0.1
          unpacked libbar/0.0.1
          configured sys:libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $* '?libbaz [0.0.1 0.0.2]' 2>>EOE;
          disfigured libbar/0.0.1
          purged libbaz/0.0.1
          fetched libfox/0.0.1
          unpacked libfox/0.0.1
          fetched libbaz/0.0.1
          unpacked libbaz/0.0.1
          configured libfox/0.0.1
          configured libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $pkg_drop libbar
      }

      : src-to-wildcard
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?libbaz' 2>>EOE;
          fetched libfox/0.0.1
          unpacked libfox/0.0.1
          fetched libbaz/0.0.1
          unpacked libbaz/0.0.1
          fetched libbar/0.0.1
          unpacked libbar/0.0.1
          configured libfox/0.0.1
          configured libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $* '?sys:libbaz' 2>>EOE;
          disfigured libbar/0.0.1
          disfigured libbaz/0.0.1
          disfigured libfox/0.0.1
          purged libfox/0.0.1
          purged libbaz/0.0.1
          configured sys:libbaz/*
          configured libbar/0.0.1
          EOE

        $pkg_drop libbar
      }

      : src-to-version
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 '?libbaz/0.0.1' 2>>EOE;
          fetched libfox/0.0.1
          unpacked libfox/0.0.1
          fetched libbaz/0.0.1
          unpacked libbaz/0.0.1
          fetched libbar/0.0.1
          unpacked libbar/0.0.1
          configured libfox/0.0.1
          configured libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $* '?sys:libbaz/0.0.1' 2>>EOE;
          disfigured libbar/0.0.1
          disfigured libbaz/0.0.1
          disfigured libfox/0.0.1
          purged libfox/0.0.1
          purged libbaz/0.0.1
          configured sys:libbaz/0.0.1
          configured libbar/0.0.1
          EOE

        $pkg_drop libbar
      }

      : sys-to-src-unhold
      :
      {
        $clone_cfg;

        $* 'sys:libbaz/1.2.0' 2>>EOE;
          configured sys:libbaz/1.2.0
          EOE

        $* ?libbaz libbar/0.0.3 2>>EOE;
          purged libbaz/1.2.0
          fetched libbaz/0.1.0
          unpacked libbaz/0.1.0
          fetched libbar/0.0.3
          unpacked libbar/0.0.3
          configured libbaz/0.1.0
          configured libbar/0.0.3
          EOE

        $pkg_drop libbar libbaz
      }

      : sys-to-src-unhold-same-ver
      :
      : Same as above but the version does not change.
      :
      {
        $clone_cfg;

        $* 'sys:libbaz/0.1.0' 2>>EOE;
          configured sys:libbaz/0.1.0
          EOE

        $* ?libbaz libbar/0.0.3 2>>EOE;
          purged libbaz/0.1.0
          fetched libbaz/0.1.0
          unpacked libbaz/0.1.0
          fetched libbar/0.0.3
          unpacked libbar/0.0.3
          configured libbaz/0.1.0
          configured libbar/0.0.3
          EOE

        $pkg_drop libbar libbaz
      }

      : sys-to-src
      :
      : As above but keep held.
      :
      {
        $clone_cfg;

        $* 'sys:libbaz/1.2.0' 2>>EOE;
          configured sys:libbaz/1.2.0
          EOE

        $* libbaz libbar/0.0.3 2>>EOE;
          purged libbaz/1.2.0
          fetched libbaz/0.1.0
          unpacked libbaz/0.1.0
          fetched libbar/0.0.3
          unpacked libbar/0.0.3
          configured libbaz/0.1.0
          configured libbar/0.0.3
          EOE

        $pkg_drop libbar libbaz
      }
    }

    : source
    :
    {
      +$clone_cfg

      : unavailable
      :
      {
        $clone_cfg;

        $* libbar/1.0.0 2>!;

        $* ?libfoo/0.0.1 2>>EOE != 0;
          error: libfoo/0.0.1 is not available from its dependents' repositories
          EOE

        $* '?libfoo < 0.0.2' 2>>EOE != 0;
          error: 'libfoo < 0.0.2' is not available from its dependents' repositories
          EOE

        $pkg_drop libbar
      }

      : satisfy
      :
      {
        $clone_cfg;
        $rep_fetch $rep/t0b;

        $* libbar/0.0.1 2>!;

        $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3 0.0.2';

        $* libbar/0.0.2 ?libbaz 2>>EOE;
          disfigured libbar/0.0.1
          disfigured libbaz/0.0.1
          disfigured libfox/0.0.1
          purged libfox/0.0.1
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbaz/0.0.2
          unpacked libbaz/0.0.2
          fetched libbar/0.0.2
          unpacked libbar/0.0.2
          configured libfoo/1.0.0
          configured libbaz/0.0.2
          configured libbar/0.0.2
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.2 available 0.1.0 0.0.4 0.0.3';

        $rep_remove $rep/t0b && $rep_fetch;

        # Test that the selected package, that is "better" than the available
        # one, is left.
        #
        $* libbox ?libbaz 2>>EOE;
          fetched libbox/0.0.1
          unpacked libbox/0.0.1
          configured libbox/0.0.1
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.2 available 0.1.0 0.0.4 0.0.3';

        $rep_remove $rep/t0a && $rep_fetch;

        # Test that the selected package is left as there is no satisfactory
        # available package.
        #
        $* ?libbaz;

        # Test that the above behavior is not triggered for the system package.
        #
        $* '?sys:libbaz' 2>>EOE;
          disfigured libbar/0.0.2
          disfigured libbox/0.0.1
          disfigured libbaz/0.0.2
          disfigured libfoo/1.0.0
          purged libfoo/1.0.0
          purged libbaz/0.0.2
          configured sys:libbaz/*
          configured libbox/0.0.1
          configured libbar/0.0.2
          EOE

        $pkg_status libbaz >'libbaz configured,system !* available 0.1.0 0.0.4 0.0.3';

        $pkg_drop libbar libbox
      }

      : satisfy-masked
      :
      : As above but using --mask-repository* instead of rep-remove.
      :
      {
        $clone_cfg;
        $rep_fetch $rep/t0b;

        $* libbar/0.0.1 2>!;

        $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3 0.0.2';

        $* libbar/0.0.2 ?libbaz 2>>EOE;
          disfigured libbar/0.0.1
          disfigured libbaz/0.0.1
          disfigured libfox/0.0.1
          purged libfox/0.0.1
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbaz/0.0.2
          unpacked libbaz/0.0.2
          fetched libbar/0.0.2
          unpacked libbar/0.0.2
          configured libfoo/1.0.0
          configured libbaz/0.0.2
          configured libbar/0.0.2
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.2 available 0.1.0 0.0.4 0.0.3';

        # Test that the selected package, that is "better" than the available
        # one, is left.
        #
        $* --mask-repository $rep/t0b libbox ?libbaz 2>>EOE;
          fetched libbox/0.0.1
          unpacked libbox/0.0.1
          configured libbox/0.0.1
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.2 available 0.1.0 0.0.4 0.0.3';

        # Test that the selected package is left as there is no satisfactory
        # available package.
        #
        $* --mask-repository $rep/t0b --mask-repository-uuid "$cfg_uuid=($rep/t0a)" ?libbaz;

        # Test that the above behavior is not triggered for the system package.
        #
        $* --mask-repository $rep/t0b --mask-repository $rep/t0a '?sys:libbaz' 2>>EOE;
          disfigured libbar/0.0.2
          disfigured libbox/0.0.1
          disfigured libbaz/0.0.2
          disfigured libfoo/1.0.0
          purged libfoo/1.0.0
          purged libbaz/0.0.2
          configured sys:libbaz/*
          configured libbox/0.0.1
          configured libbar/0.0.2
          EOE

        $pkg_status libbaz >'libbaz configured,system !* available 0.1.0 0.0.4 0.0.3 0.0.2 0.0.1';

        $pkg_drop libbar libbox
      }

      : unsatisfied
      :
      {
        $clone_cfg;

        $* libbar/0.0.1 2>!;

        $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3';

        $* ?libbaz/0.0.3 2>>EOE != 0;
          error: package libbaz doesn't satisfy its dependents
            info: libbaz/0.0.3 doesn't satisfy libbar/0.0.1
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3';

        $pkg_drop libbar
      }

      : unsatisfied-config
      :
      : As above but with a linked configuration.
      :
      {
        $clone_cfg;
        $cfg_create -d cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $* libbar/0.0.1 2>!;

        $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3';

        $* ?libbaz/0.0.3 +{ --config-id 1 } 2>>~%EOE% != 0;
          %error: package libbaz \[cfg2.\] doesn't satisfy its dependents%
            info: libbaz/0.0.3 doesn't satisfy libbar/0.0.1
          EOE

        $pkg_status libbaz >'libbaz configured 0.0.1 available 0.1.0 0.0.4 0.0.3';

        $pkg_drop libbar
      }
    }

    : scratch
    :
    {
      $clone_cfg;

      $* libbox 2>!;

      $pkg_status libbaz >'libbaz configured 0.0.3 available 0.1.0 0.0.4';
      $pkg_status libfoo >'libfoo configured 0.0.1 available 1.0.0';
      $pkg_status libfox >'libfox available 0.0.1';

      # After the first simulation it is discovered that libfoo needs to be
      # upgraded to 1.0.0. But after the second simulation, that upgrades
      # libfoo, it is discovered that it is now unused (libbaz doesn't need it
      # anymore). So we replace libfoo upgrade with drop and start from
      # scratch.
      #
      $* ?libfoo/1.0.0 ?libbaz/0.0.1 2>>EOE;
        disfigured libbox/0.0.1
        disfigured libbaz/0.0.3
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        purged libfoo/0.0.1
        fetched libfox/0.0.1
        unpacked libfox/0.0.1
        fetched libbaz/0.0.1
        unpacked libbaz/0.0.1
        configured libfox/0.0.1
        configured libbaz/0.0.1
        configured libbox/0.0.1
        EOE

      $pkg_status libbaz >'libbaz configured !0.0.1 available 0.1.0 0.0.4 0.0.3';
      $pkg_status libfoo >'libfoo available 1.0.0 0.0.1';
      $pkg_status libfox >'libfox configured 0.0.1';

      $pkg_drop libbox
    }

    : reconf-dependent
    :
    {
      $clone_cfg;
      $rep_fetch $rep/t0b;

      $* libbar/0.0.2 2>!;

      $pkg_status libbaz >'libbaz configured 0.0.2 available 0.1.0 0.0.4 0.0.3';
      $pkg_status libfoo >'libfoo configured 1.0.0';

      $* '?sys:libfoo' ?libbaz/0.0.2 2>>EOE;
        disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        configured sys:libfoo/*
        configured libbaz/0.0.2
        configured libbar/0.0.2
        EOE

      $pkg_drop libbar
    }
  }

  : unhold
  :
  {
    test.arguments += --configure-only

    +$clone_root_cfg
    +$rep_fetch $rep/t0a

    : drop
    :
    {
      $clone_cfg;

      $* libfox 2>!;

      $* ?libfox --yes 2>>EOE;
        disfigured libfox/0.0.1
        purged libfox/0.0.1
        EOE

      $pkg_status libfox >'libfox available 0.0.1'
    }

    : silent
    :
    {
      $clone_cfg;

      $* libbar libbaz --yes 2>!;
      $pkg_status libbaz >'!libbaz configured 0.0.1 available 0.0.3';

      $* ?libbaz;
      $pkg_status libbaz >'libbaz configured 0.0.1 available 0.0.3';

      $pkg_drop libbar
    }

    : prompt
    :
    {
      $clone_cfg;

      $* libbar libbaz --yes 2>!;
      $pkg_status libbaz >'!libbaz configured 0.0.1 available 0.0.3';

      $* '?sys:libbaz' < 'y' 2>>EOE;
          drop libfox/0.0.1 (unused)
          reconfigure/unhold sys:libbaz/*
          reconfigure libbar (dependent of libbaz)
        continue? [Y/n] disfigured libbar/0.0.1
        disfigured libbaz/0.0.1
        disfigured libfox/0.0.1
        purged libfox/0.0.1
        purged libbaz/0.0.1
        configured sys:libbaz/*
        configured libbar/0.0.1
        EOE

      $pkg_status libbaz >'libbaz configured,system !* available 0.0.3 0.0.1';

      $pkg_drop libbar
    }

    : unheld
    :
    {
      $clone_cfg;

      $* libbar ?libbaz --yes 2>!;
      $pkg_status libbaz >'libbaz configured 0.0.1 available 0.0.3';

      $* ?libbaz;
      $pkg_status libbaz >'libbaz configured 0.0.1 available 0.0.3';

      $pkg_drop libbar
    }
  }

  : options
  :
  {
    : keep-out
    :
    : Test that --keep-out is properly propagated when building libhello
    : as a dependency, so it is built incrementally.
    :
    {
      $cfg_create cxx $config_cxx -d cfg &cfg/***;

      # Add libhello as the dir repository.
      #
      cp -r $src/libhello-1.0.0 ./libhello;
      $rep_add libhello --type dir;

      # Add libfoo as the dir repository and make it a dependent of libhello.
      #
      cp -r $src/libfoo-1.1.0 libfoo;
      echo 'depends: libhello' >+libfoo/manifest;
      $rep_add libfoo --type dir;

      $rep_fetch;

      # Note that libfoo building doesn't trigger libhello building as it is a
      # fake dependent, so build both explicitly.
      #
      $* libfoo libhello 2>!;

      # Move libhello version ahead.
      #
      sed -i -e 's/(version: 1.0).0/\1.1/' libhello/manifest;
      $rep_fetch;

      # Upgrade libhello as a dependency.
      #
      # Note that despite the fact that we have modified the libhello's
      # manifest file after the build, libhello may still be considered up to
      # date on filesystems with a low file timestamps resolution (for example
      # HFS+).
      #
      $* ?libhello --yes --keep-out 2>>~%EOE%;
        disfigured libfoo/1.1.0
        disfigured libhello/1.0.0
        using libhello/1.0.1 (external)
        configured libhello/1.0.1
        configured libfoo/1.1.0
        %info: .+libfoo.+ is up to date%
        updated libfoo/1.1.0
        EOE

      test -d cfg/libhello/libhello
    }
  }

  : dependents
  :
  {
    test.arguments += --yes --configure-only

    : order
    :
    : Test that libbar that is built but isn't upgraded (and so doesn't order
    : itself against dependencies) is still properly reconfigured being
    : ordered as (an indirect) dependent of libfoo.
    :
    {
      $clone_root_cfg;
      $rep_fetch $rep/t0a $rep/t0b;

      $* libbar libfoo/0.0.1 2>>EOE;
        fetched libfix/0.0.1
        unpacked libfix/0.0.1
        fetched libfoo/0.0.1
        unpacked libfoo/0.0.1
        fetched libbaz/0.0.2
        unpacked libbaz/0.0.2
        fetched libbar/0.0.2
        unpacked libbar/0.0.2
        configured libfix/0.0.1
        configured libfoo/0.0.1
        configured libbaz/0.0.2
        configured libbar/0.0.2
        EOE

      $* libbar libfoo 2>>EOE;
        disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        configured libbaz/0.0.2
        configured libbar/0.0.2
        EOE

      $pkg_drop libbaz libbar libfoo
    }

    : adjust-merge-build
    :
    : Test that the registered in the map package build (libfoo) is properly
    : merged into the reconfigure adjustment as a dependent of the
    : reconfigured dependency (see collect_dependents() for more details).
    :
    {
      $clone_root_cfg;
      $rep_fetch $rep/t0a;

      $* libfoo 2>>EOE;
        fetched libfix/0.0.1
        unpacked libfix/0.0.1
        fetched libfoo/0.0.1
        unpacked libfoo/0.0.1
        configured libfix/0.0.1
        configured libfoo/0.0.1
        EOE

      $* libbaz libbar 'sys:libfix' 2>>EOE;
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        fetched libfox/0.0.1
        unpacked libfox/0.0.1
        fetched libbaz/0.0.1
        unpacked libbaz/0.0.1
        fetched libbar/0.0.1
        unpacked libbar/0.0.1
        purged libfix/0.0.1
        configured libfox/0.0.1
        configured libbaz/0.0.1
        configured libbar/0.0.1
        configured sys:libfix/*
        configured libfoo/0.0.1
        EOE

      $pkg_drop libbaz libbar libfoo
    }

    : reconfiguration
    :
    {
      +$clone_root_cfg
      +$rep_add $rep/t4f && $rep_fetch

      : re-order
      :
      : This test reproduced a failure of the collect_order_dependents()
      : function (now turned into collect_dependents()) to properly order
      : dependents of a being upgraded package, if the current version of this
      : package is a dependent of a being reconfigured dependency. The now
      : fixed bug ended up with the 'unable to satisfy dependency' failure of
      : the subsequent pkg_configure() function call for the described case.
      :
      {
        $clone_cfg;

        $* libbar libbox/1.0.0 ?libbax/1.0.0 2>!;

        $pkg_status -ar >>EOO;
          libbax configured !1.0.0 available 2.0.0
          !libbox configured !1.0.0 available 2.0.0
            libbax configured !1.0.0 available 2.0.0
          !libbar configured 2.1.0
            !libbox configured !1.0.0 available 2.0.0
              libbax configured !1.0.0 available 2.0.0
          EOO

        $* libfoo libbax 2>>EOE;
          warning: package libfoo dependency on (libbar == 1.2.0) is forcing downgrade of libbar/2.1.0 to 1.2.0
          disfigured libbar/2.1.0
          disfigured libbox/1.0.0
          disfigured libbax/1.0.0
          fetched libbax/2.0.0
          unpacked libbax/2.0.0
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          fetched libfoo/2.0.0
          unpacked libfoo/2.0.0
          configured libbax/2.0.0
          configured libbox/1.0.0
          configured libbar/1.2.0
          configured libfoo/2.0.0
          EOE

        $pkg_status -ar >>EOO;
          !libbax configured 2.0.0
          !libbox configured !1.0.0 available 2.0.0
            !libbax configured 2.0.0
          !libbar configured 1.2.0 available 2.1.0
          !libfoo configured 2.0.0
            !libbar configured 1.2.0 available 2.1.0
          EOO

        $pkg_drop libbax libbox libbar libfoo
      }

      : re-order-unsatisfied
      :
      : Similar to the above but the dependent of the mentioned package is
      : unsatisfied with its dependencies.
      :
      {
        $clone_cfg;

        $* libbar libbox ?libbax/1.0.0 2>!;

        $pkg_status -ar >>EOO;
          libbax configured !1.0.0 available 2.0.0
          !libbox configured 2.0.0
            libbax configured !1.0.0 available 2.0.0
          !libbar configured 2.1.0
            !libbox configured 2.0.0
              libbax configured !1.0.0 available 2.0.0
          EOO

        $* libfoo libbax/2.0.0 --verbose 5 2>>~%EOE% != 0;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libfoo/2.0.0
          trace: collect_build: add libbax/2.0.0
          trace: collect_build_prerequisites: begin libfoo/2.0.0
          trace: collect_build: add libbar/1.2.0
          warning: package libfoo dependency on (libbar == 1.2.0) is forcing downgrade of libbar/2.1.0 to 1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          trace: collect_build_prerequisites: end libfoo/2.0.0
          trace: collect_build_prerequisites: skip unsatisfied existing dependent libbox of dependency libbax/2.0.0 due to constraint (libbax == 1.0.0)
          trace: collect_build_prerequisites: begin libbax/2.0.0
          trace: collect_build_prerequisites: end libbax/2.0.0
          trace: collect_dependents: postpone failure for existing dependent libbox unsatisfied with dependency libbax/2.0.0 (== 1.0.0)
          trace: execute_plan: simulate: yes
          %.*
          error: unable to upgrade package libbax/1.0.0 to 2.0.0
            info: because configured package libbox/2.0.0 depends on (libbax == 1.0.0)
            info: consider re-trying with --upgrade|-u potentially combined with --recursive|-r
            info: or explicitly request up/downgrade of package libbox
            info: or explicitly specify package libbax version to manually satisfy these constraints
          %.*
          EOE

        $pkg_drop libbox libbar
      }
    }

    : denied-version-replacements
    :
    {
      +$clone_root_cfg
      +$rep_add $rep/t4j && $rep_fetch

      : unsatisfactory-version
      :
      {
        $clone_cfg;

        $* libbaz libfoo libfox --plan "" --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libbaz/2.1.0
          trace: collect_build: add libfoo/3.0.0
          trace: collect_build: add libfox/3.0.0
          trace: collect_build_prerequisites: begin libbaz/2.1.0
          trace: collect_build_prerequisites: end libbaz/2.1.0
          trace: collect_build_prerequisites: begin libfoo/3.0.0
          trace: collect_build: add libbar/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/3.0.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          trace: collect_build_prerequisites: end libfoo/3.0.0
          trace: collect_build_prerequisites: begin libfox/3.0.0
          trace: collect_build: pick libbar/0.1.0 over libbar/1.2.0
          trace: collect_build: libbar/1.2.0 package version needs to be replaced with libbar/0.1.0
          trace: pkg_build: collection failed due to package version replacement, retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libbaz/2.1.0
          trace: collect_build: add libfoo/3.0.0
          trace: collect_build: add libfox/3.0.0
          trace: collect_build_prerequisites: begin libbaz/2.1.0
          trace: collect_build_prerequisites: end libbaz/2.1.0
          trace: collect_build_prerequisites: begin libfoo/3.0.0
          trace: collect_build: apply version replacement for libbar/1.2.0
          trace: collect_build: replacement: libbar/0.1.0
          trace: collect_build: add libbar/0.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfoo/3.0.0
          trace: collect_build_prerequisites: begin libbar/0.1.0
          trace: collect_build_prerequisites: end libbar/0.1.0
          trace: collect_build_prerequisites: end libfoo/3.0.0
          trace: collect_build_prerequisites: begin libfox/3.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/3.0.0
          trace: collect_build: pick libbaz/1.2.0 over libbaz/2.1.0
          trace: collect_build: libbaz/2.1.0 package version needs to be replaced with libbaz/1.2.0
          trace: pkg_build: collection failed due to package version replacement, retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: apply version replacement for libbaz/2.1.0
          trace: collect_build: replacement: libbaz/1.2.0
          trace: collect_build: add libbaz/1.2.0
          trace: collect_build: add libfoo/3.0.0
          trace: collect_build: add libfox/3.0.0
          trace: collect_build_prerequisites: begin libbaz/1.2.0
          trace: collect_build: apply version replacement for libbar/1.2.0
          trace: collect_build: replacement to 0.1.0 is denied since libbaz/1.2.0 depends on (libbar == 1.2.0)
          trace: collect_build: add libbar/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/1.2.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          trace: collect_build_prerequisites: end libbaz/1.2.0
          trace: collect_build_prerequisites: begin libfoo/3.0.0
          trace: collect_build: apply version replacement for libbar/1.2.0
          trace: collect_build: replacement: libbar/0.1.0
          trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/3.0.0
          trace: collect_build_prerequisites: end libfoo/3.0.0
          trace: collect_build_prerequisites: begin libfox/3.0.0
          trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/1.2.0 (== 0.1.0)
          trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/3.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.2.0 of dependent libfox/3.0.0
          trace: collect_build_prerequisites: end libfox/3.0.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency libbar/1.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent libfox/3.0.0 of dependency libbar/1.2.0 with some other version
          trace: try_replace_dependency: replace unsatisfied dependent version libfox/3.0.0 with 2.1.0 by adding constraint 'libfox' -> 'libfox == 2.1.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libbaz/2.1.0
          trace: collect_build: add libfoo/3.0.0
          trace: collect_build: add libfox/2.1.0
          trace: collect_build_prerequisites: begin libbaz/2.1.0
          trace: collect_build_prerequisites: end libbaz/2.1.0
          trace: collect_build_prerequisites: begin libfoo/3.0.0
          trace: collect_build: add libbar/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/3.0.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          trace: collect_build_prerequisites: end libfoo/3.0.0
          trace: collect_build_prerequisites: begin libfox/2.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/2.1.0
          trace: collect_build: pick libbaz/1.2.0 over libbaz/2.1.0
          trace: collect_build: libbaz/2.1.0 package version needs to be replaced with libbaz/1.2.0
          trace: pkg_build: collection failed due to package version replacement, retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: apply version replacement for libbaz/2.1.0
          trace: collect_build: replacement: libbaz/1.2.0
          trace: collect_build: add libbaz/1.2.0
          trace: collect_build: add libfoo/3.0.0
          trace: collect_build: add libfox/2.1.0
          trace: collect_build_prerequisites: begin libbaz/1.2.0
          trace: collect_build: add libbar/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/1.2.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          trace: collect_build_prerequisites: end libbaz/1.2.0
          trace: collect_build_prerequisites: begin libfoo/3.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/3.0.0
          trace: collect_build_prerequisites: end libfoo/3.0.0
          trace: collect_build_prerequisites: begin libfox/2.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/2.1.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.2.0 of dependent libfox/2.1.0
          trace: collect_build_prerequisites: end libfox/2.1.0
          trace: execute_plan: simulate: yes
          %.*
            new libbar/1.2.0 (required by libbaz, libfoo, libfox)
            new libbaz/1.2.0
            new libfoo/3.0.0
            new libfox/2.1.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -ar >>EOO;
          libbar configured 1.2.0
          !libbaz configured 1.2.0 available 2.1.0
            libbar configured 1.2.0
          !libfoo configured 3.0.0
            libbar configured 1.2.0
          !libfox configured 2.1.0 available 3.0.0
            libbar configured 1.2.0
            !libbaz configured 1.2.0 available 2.1.0
              libbar configured 1.2.0
          EOO

        $pkg_drop libbaz libfoo libfox
      }

      : collect-drop
      :
      {
        $clone_cfg;

        $* libfix ?libfox/0.0.1 libbaz 2>!;

        $pkg_status -ar >>EOO;
          libfox configured !0.0.1 available 3.0.0 2.1.0
          !libfix configured 1.0.0
            libfox configured !0.0.1 available 3.0.0 2.1.0
          !libbaz configured 2.1.0
          EOO

        $* ?libbaz ?libfox/2.1.0 --verbose 5 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libfox/0.0.1: update to libfox/2.1.0
          trace: evaluate_dependency: libbaz/2.1.0: unused
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval libfix/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated libfix/1.0.0: end reached
          trace: collect_build_prerequisites: begin libfox/2.1.0
          trace: collect_build: add libbar/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/2.1.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          warning: package libfox dependency on (libbaz == 1.2.0) is forcing downgrade of libbaz/2.1.0 to 1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.2.0 of dependent libfox/2.1.0
          trace: collect_build_prerequisites: begin libbaz/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/1.2.0
          trace: collect_build_prerequisites: end libbaz/1.2.0
          trace: collect_build_prerequisites: end libfox/2.1.0
          trace: collect_drop: libbaz cannot be dropped since it is required by command line, libfox/2.1.0
          trace: execute_plan: simulate: yes
          %.*
          trace: pkg_build: one of dependency evaluation decisions has changed, re-collecting from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build_prerequisites: pre-reeval libfix/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated libfix/1.0.0: end reached
          trace: collect_build_prerequisites: begin libfox/2.1.0
          trace: collect_build: add libbar/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/2.1.0
          trace: collect_build_prerequisites: begin libbar/1.2.0
          trace: collect_build_prerequisites: end libbar/1.2.0
          warning: package libfox dependency on (libbaz == 1.2.0) is forcing downgrade of libbaz/2.1.0 to 1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.2.0 of dependent libfox/2.1.0
          trace: collect_build_prerequisites: begin libbaz/1.2.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/1.2.0
          trace: collect_build_prerequisites: end libbaz/1.2.0
          trace: collect_build_prerequisites: end libfox/2.1.0
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -ar >>EOO;
          libfox configured !2.1.0 available 3.0.0
            libbar configured 1.2.0
            libbaz configured 1.2.0 available 2.1.0
              libbar configured 1.2.0
          !libfix configured 1.0.0
            libfox configured !2.1.0 available 3.0.0
              libbar configured 1.2.0
              libbaz configured 1.2.0 available 2.1.0
                libbar configured 1.2.0
          libbaz configured 1.2.0 available 2.1.0
            libbar configured 1.2.0
          libbar configured 1.2.0
          EOO

        $pkg_drop libfix
      }
    }

    : constraint-resolution
    :
    {
      +$clone_root_cfg
      +$rep_add $rep/t4f && $rep_fetch

      test.arguments += --plan "" --verbose 5

      : replace-dependent
      :
      {
        +$clone_cfg

        : basics
        :
        : This test demonstrates a case when the dependency resolution
        : machinery resolves unsatisfied dependency constraints by adding the
        : package spec to the command line for an unsatisfied dependent
        : version.
        :
        {
          $clone_cfg;

          $* libfoo libfix 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build: add libfix/1.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build: add libfox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/2.0.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfox/2.0.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/1.2.0 (>= 2.0.0)
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/2.0.0
            trace: collect_build_prerequisites: end libfox/2.0.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/1.2.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfied dependent libfox/2.0.0 of dependency libbar/1.2.0 with some other version
            trace: try_replace_dependency: replace unsatisfied dependent version libfox/2.0.0 with 1.1.0 by adding package spec '?libfox == 1.1.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build: add libfix/1.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/1.1.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0 (required by libfoo, libfox)
              new libfoo/2.0.0
              new libfox/1.1.0 (required by libfix)
              new libfix/1.0.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libfoo configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            libfox configured 1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libfix configured 1.0.0
              libfox configured 1.1.0 available 2.0.0
                libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfoo libfix
        }

        : reorder
        :
        : Similar to the above, but the unsatisfied dependent which needs to be
        : replaced differs from the one added to the unsatisfied dependents
        : list.
        :
        {
          $clone_cfg;

          $* libfix libfoo 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfix/1.0.0
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build: add libfox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/2.0.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfox/2.0.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfox/2.0.0
            trace: collect_build_prerequisites: begin libbar/2.1.0
            trace: collect_build: add libbox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbox/2.0.0 of dependent libbar/2.1.0
            trace: collect_build_prerequisites: begin libbox/2.0.0
            trace: collect_build: add libbax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/1.0.0 of dependent libbox/2.0.0
            trace: collect_build_prerequisites: begin libbax/1.0.0
            trace: collect_build_prerequisites: end libbax/1.0.0
            trace: collect_build_prerequisites: end libbox/2.0.0
            trace: collect_build_prerequisites: end libbar/2.1.0
            trace: collect_build_prerequisites: end libfox/2.0.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: postpone failure for dependent libfoo unsatisfied with dependency libbar/2.1.0 (== 1.2.0)
            trace: collect_build: pick libbar/2.1.0 over libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/2.1.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfied dependent libfoo/2.0.0 of dependency libbar/2.1.0 with some other version
            trace: try_replace_dependent: try to replace conflicting dependent libfox/2.0.0 of dependency libbar/2.1.0 with some other version
            trace: try_replace_dependency: replace conflicting dependent version libfox/2.0.0 with 1.1.0 by adding package spec '?libfox == 1.1.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfix/1.0.0
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/1.1.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/2.1.0
            trace: collect_build: add libbox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbox/2.0.0 of dependent libbar/2.1.0
            trace: collect_build_prerequisites: begin libbox/2.0.0
            trace: collect_build: add libbax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/1.0.0 of dependent libbox/2.0.0
            trace: collect_build_prerequisites: begin libbax/1.0.0
            trace: collect_build_prerequisites: end libbax/1.0.0
            trace: collect_build_prerequisites: end libbox/2.0.0
            trace: collect_build_prerequisites: end libbar/2.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build: libbar/2.1.0 package version needs to be replaced with libbar/1.2.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfix/1.0.0
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/1.1.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: apply version replacement for libbar/2.1.0
            trace: collect_build: replacement: libbar/1.2.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0 (required by libfoo, libfox)
              new libfox/1.1.0 (required by libfix)
              new libfix/1.0.0
              new libfoo/2.0.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            libfox configured 1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libfix configured 1.0.0
              libfox configured 1.1.0 available 2.0.0
                libbar configured 1.2.0 available 2.1.0
            !libfoo configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfoo libfix
        }

        : to-hold
        :
        : Similar to the basics test, but the unsatisfied dependent is being
        : built to hold rather than as a dependency.
        :
        {
          $clone_cfg;

          $* libfoo libfox 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build: add libfox/2.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfox/2.0.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/1.2.0 (>= 2.0.0)
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/2.0.0
            trace: collect_build_prerequisites: end libfox/2.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: try_replace_dependent: try to replace unsatisfied dependent libfox/2.0.0 of dependency libbar/1.2.0 with some other version
            trace: try_replace_dependency: replace unsatisfied dependent version libfox/2.0.0 with 1.1.0 by adding constraint 'libfox' -> 'libfox == 1.1.0' on command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0 (required by libfoo, libfox)
              new libfoo/2.0.0
              new libfox/1.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libfoo configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libfox configured 1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfoo libfox
        }

        : to-hold-reorder
        :
        : Similar to the above, but the unsatisfied dependent which needs to be
        : replaced differs from the one added to the unsatisfied dependents
        : list.
        :
        {
          $clone_cfg;

          $* libfox libfoo 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/2.0.0
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfox/2.0.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfox/2.0.0
            trace: collect_build_prerequisites: begin libbar/2.1.0
            trace: collect_build: add libbox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbox/2.0.0 of dependent libbar/2.1.0
            trace: collect_build_prerequisites: begin libbox/2.0.0
            trace: collect_build: add libbax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/1.0.0 of dependent libbox/2.0.0
            trace: collect_build_prerequisites: begin libbax/1.0.0
            trace: collect_build_prerequisites: end libbax/1.0.0
            trace: collect_build_prerequisites: end libbox/2.0.0
            trace: collect_build_prerequisites: end libbar/2.1.0
            trace: collect_build_prerequisites: end libfox/2.0.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: postpone failure for dependent libfoo unsatisfied with dependency libbar/2.1.0 (== 1.2.0)
            trace: collect_build: pick libbar/2.1.0 over libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/2.1.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfied dependent libfoo/2.0.0 of dependency libbar/2.1.0 with some other version
            trace: try_replace_dependent: try to replace conflicting dependent libfox/2.0.0 of dependency libbar/2.1.0 with some other version
            trace: try_replace_dependency: replace conflicting dependent version libfox/2.0.0 with 1.1.0 by adding constraint 'libfox' -> 'libfox == 1.1.0' on command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/2.1.0
            trace: collect_build: add libbox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbox/2.0.0 of dependent libbar/2.1.0
            trace: collect_build_prerequisites: begin libbox/2.0.0
            trace: collect_build: add libbax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/1.0.0 of dependent libbox/2.0.0
            trace: collect_build_prerequisites: begin libbax/1.0.0
            trace: collect_build_prerequisites: end libbax/1.0.0
            trace: collect_build_prerequisites: end libbox/2.0.0
            trace: collect_build_prerequisites: end libbar/2.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build: libbar/2.1.0 package version needs to be replaced with libbar/1.2.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libfoo/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: apply version replacement for libbar/2.1.0
            trace: collect_build: replacement: libbar/1.2.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: begin libfoo/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfoo/2.0.0
            trace: collect_build_prerequisites: end libfoo/2.0.0
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0 (required by libfoo, libfox)
              new libfox/1.1.0
              new libfoo/2.0.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libfox configured 1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libfoo configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfoo libfox
        }

        : unsatisfied-dependent
        :
        : This test demonstrates a case when the dependency resolution
        : machinery resolves unsatisfied dependency constraints by
        : enforcing noop.
        :
        : Note that there is no version constraints are specified on the
        : command line, the request is to upgrade all packages to the latest
        : possible versions, and thus noop in this case is an appropriate
        : outcome.
        :
        {
          $clone_cfg;

          $* libbox ?libbix/1.0.0 libbux 2>!;

          $pkg_status -ar >>EOO;
            libbax configured 1.0.0 available 2.0.0
            !libbox configured 2.0.0
              libbax configured 1.0.0 available 2.0.0
            libbix configured !1.0.0 available 2.0.0
              libbax configured 1.0.0 available 2.0.0
            !libbux configured 1.0.0
              libbix configured !1.0.0 available 2.0.0
                libbax configured 1.0.0 available 2.0.0
            EOO

          $* --upgrade --recursive 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbox/2.0.0
            trace: collect_build: add libbux/1.0.0
            trace: collect_build_prerequisites: skip configured libbox/2.0.0
            trace: collect_build_prerequisites: skip configured libbux/1.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: libbix/1.0.0: update to libbix/2.0.0
            %.*
            trace: pkg_build: refine package collection/plan execution
            trace: collect_build: add libbix/2.0.0
            trace: collect_build_prerequisites: pre-reeval libbux/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated libbux/1.0.0: end reached
            trace: collect_build_prerequisites: begin libbix/2.0.0
            trace: collect_build: add libbax/2.0.0
            info: package libbix dependency on (libbax == 2.0.0) is forcing upgrade of libbax/1.0.0 to 2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/2.0.0 of dependent libbix/2.0.0
            trace: collect_build_prerequisites: skip unsatisfied existing dependent libbox of dependency libbax/2.0.0 due to constraint (libbax == 1.0.0)
            trace: collect_build_prerequisites: skip being built existing dependent libbix of dependency libbax
            trace: collect_build_prerequisites: begin libbax/2.0.0
            trace: collect_build_prerequisites: end libbax/2.0.0
            trace: collect_build_prerequisites: end libbix/2.0.0
            trace: collect_dependents: postpone failure for existing dependent libbox unsatisfied with dependency libbax/2.0.0 (== 1.0.0)
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbax/2.0.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfiable dependent libbix/2.0.0 of dependency libbax/2.0.0 with some other version
            trace: try_replace_dependency: replace unsatisfiable dependent version libbix/2.0.0 with 1.0.0 by adding package spec '?libbix == 1.0.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbox/2.0.0
            trace: collect_build: add libbux/1.0.0
            trace: collect_build_prerequisites: skip configured libbox/2.0.0
            trace: collect_build_prerequisites: skip configured libbux/1.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbax configured 1.0.0 available 2.0.0
            !libbox configured 2.0.0
              libbax configured 1.0.0 available 2.0.0
            libbix configured !1.0.0 available 2.0.0
              libbax configured 1.0.0 available 2.0.0
            !libbux configured 1.0.0
              libbix configured !1.0.0 available 2.0.0
                libbax configured 1.0.0 available 2.0.0
            EOO

          $pkg_drop libbox libbux
        }

        : indirect
        :
        : Test replacement of indirect dependents of an unsatisfactory
        : dependency.
        :
        {
          $clone_root_cfg;
          $rep_add $rep/t4k && $rep_fetch;

          $* libbaz libbar 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build: add libfox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/2.0.0 of dependent libbaz/1.0.0
            trace: collect_build_prerequisites: begin libfox/2.0.0
            trace: collect_build: add libfux/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfux/2.0.0 of dependent libfox/2.0.0
            trace: collect_build_prerequisites: begin libfux/2.0.0
            trace: collect_build: add libfaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/2.0.0 of dependent libfux/2.0.0
            trace: collect_build_prerequisites: begin libfaz/2.0.0
            trace: collect_build: add libfuz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/2.0.0 of dependent libfaz/2.0.0
            trace: collect_build_prerequisites: begin libfuz/2.0.0
            trace: collect_build_prerequisites: end libfuz/2.0.0
            trace: collect_build_prerequisites: end libfaz/2.0.0
            trace: collect_build: add libfex/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfex/2.0.0 of dependent libfux/2.0.0
            trace: collect_build_prerequisites: begin libfex/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/2.0.0 of dependent libfex/2.0.0
            trace: collect_build_prerequisites: end libfex/2.0.0
            trace: collect_build_prerequisites: end libfux/2.0.0
            trace: collect_build_prerequisites: end libfox/2.0.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build: add libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfix/1.0.0 of dependent libfoo/1.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build: add libfax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfax/1.0.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfax/1.0.0
            trace: collect_build: postpone failure for dependent libfax unsatisfied with dependency libfuz/2.0.0 (== 1.0.0)
            trace: collect_build: pick libfuz/2.0.0 over libfuz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/2.0.0 of dependent libfax/1.0.0
            trace: collect_build_prerequisites: end libfax/1.0.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libfuz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfied dependent libfax/1.0.0 of dependency libfuz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace conflicting dependent libfaz/2.0.0 of dependency libfuz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfix/1.0.0 of dependency libfax/1.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfoo/1.0.0 of dependency libfix/1.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libbar/1.0.0 of dependency libfoo/1.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfux/2.0.0 of dependency libfaz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfex/2.0.0 of dependency libfaz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfox/2.0.0 of dependency libfux/2.0.0 with some other version
            trace: try_replace_dependency: replace constraining dependent version libfox/2.0.0 with 1.2.0 by adding package spec '?libfox == 1.2.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/1.2.0 of dependent libbaz/1.0.0
            trace: collect_build_prerequisites: begin libfox/1.2.0
            trace: collect_build: add libfux/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfux/1.0.0 of dependent libfox/1.2.0
            trace: collect_build_prerequisites: begin libfux/1.0.0
            trace: collect_build: add libfaz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/1.0.0 of dependent libfux/1.0.0
            trace: collect_build_prerequisites: begin libfaz/1.0.0
            trace: collect_build: add libfuz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/1.0.0 of dependent libfaz/1.0.0
            trace: collect_build_prerequisites: begin libfuz/1.0.0
            trace: collect_build_prerequisites: end libfuz/1.0.0
            trace: collect_build_prerequisites: end libfaz/1.0.0
            trace: collect_build: add libfex/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfex/1.0.0 of dependent libfux/1.0.0
            trace: collect_build_prerequisites: begin libfex/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/1.0.0 of dependent libfex/1.0.0
            trace: collect_build_prerequisites: end libfex/1.0.0
            trace: collect_build_prerequisites: end libfux/1.0.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libfex/1.0.0 (>= 2.0.0)
            trace: collect_build: pick libfex/1.0.0 over libfex/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfex/1.0.0 of dependent libfox/1.2.0
            trace: collect_build_prerequisites: end libfox/1.2.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build: add libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfix/1.0.0 of dependent libfoo/1.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build: add libfax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfax/1.0.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/1.0.0 of dependent libfax/1.0.0
            trace: collect_build_prerequisites: end libfax/1.0.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libfex/1.0.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfied dependent libfox/1.2.0 of dependency libfex/1.0.0 with some other version
            trace: try_replace_dependency: replacement of unsatisfied dependent version libfox/1.2.0 is denied since it is specified on command line as '?libfox == 1.2.0'
            trace: try_replace_dependent: try to replace conflicting dependent libfux/1.0.0 of dependency libfex/1.0.0 with some other version
            trace: pkg_build: cannot replace any package, rolling back latest command line adjustment ('?libfox == 1.2.0')
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build: add libfox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/2.0.0 of dependent libbaz/1.0.0
            trace: collect_build_prerequisites: begin libfox/2.0.0
            trace: collect_build: add libfux/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfux/2.0.0 of dependent libfox/2.0.0
            trace: collect_build_prerequisites: begin libfux/2.0.0
            trace: collect_build: add libfaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/2.0.0 of dependent libfux/2.0.0
            trace: collect_build_prerequisites: begin libfaz/2.0.0
            trace: collect_build: add libfuz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/2.0.0 of dependent libfaz/2.0.0
            trace: collect_build_prerequisites: begin libfuz/2.0.0
            trace: collect_build_prerequisites: end libfuz/2.0.0
            trace: collect_build_prerequisites: end libfaz/2.0.0
            trace: collect_build: add libfex/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfex/2.0.0 of dependent libfux/2.0.0
            trace: collect_build_prerequisites: begin libfex/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/2.0.0 of dependent libfex/2.0.0
            trace: collect_build_prerequisites: end libfex/2.0.0
            trace: collect_build_prerequisites: end libfux/2.0.0
            trace: collect_build_prerequisites: end libfox/2.0.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build: add libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfix/1.0.0 of dependent libfoo/1.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build: add libfax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfax/1.0.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfax/1.0.0
            trace: collect_build: postpone failure for dependent libfax unsatisfied with dependency libfuz/2.0.0 (== 1.0.0)
            trace: collect_build: pick libfuz/2.0.0 over libfuz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/2.0.0 of dependent libfax/1.0.0
            trace: collect_build_prerequisites: end libfax/1.0.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libfuz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace unsatisfied dependent libfax/1.0.0 of dependency libfuz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace conflicting dependent libfaz/2.0.0 of dependency libfuz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfix/1.0.0 of dependency libfax/1.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfoo/1.0.0 of dependency libfix/1.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libbar/1.0.0 of dependency libfoo/1.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfux/2.0.0 of dependency libfaz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfex/2.0.0 of dependency libfaz/2.0.0 with some other version
            trace: try_replace_dependent: try to replace constraining dependent libfox/2.0.0 of dependency libfux/2.0.0 with some other version
            trace: try_replace_dependency: replacement libfox/1.2.0 tried earlier for same command line, skipping
            trace: try_replace_dependency: replace constraining dependent version libfox/2.0.0 with 1.0.0 by adding package spec '?libfox == 1.0.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfox/1.0.0 of dependent libbaz/1.0.0
            trace: collect_build_prerequisites: begin libfox/1.0.0
            trace: collect_build: add libfux/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfux/1.0.0 of dependent libfox/1.0.0
            trace: collect_build_prerequisites: begin libfux/1.0.0
            trace: collect_build: add libfaz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/1.0.0 of dependent libfux/1.0.0
            trace: collect_build_prerequisites: begin libfaz/1.0.0
            trace: collect_build: add libfuz/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/1.0.0 of dependent libfaz/1.0.0
            trace: collect_build_prerequisites: begin libfuz/1.0.0
            trace: collect_build_prerequisites: end libfuz/1.0.0
            trace: collect_build_prerequisites: end libfaz/1.0.0
            trace: collect_build: add libfex/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfex/1.0.0 of dependent libfux/1.0.0
            trace: collect_build_prerequisites: begin libfex/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfaz/1.0.0 of dependent libfex/1.0.0
            trace: collect_build_prerequisites: end libfex/1.0.0
            trace: collect_build_prerequisites: end libfux/1.0.0
            trace: collect_build_prerequisites: end libfox/1.0.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build: add libfix/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfix/1.0.0 of dependent libfoo/1.0.0
            trace: collect_build_prerequisites: begin libfix/1.0.0
            trace: collect_build: add libfax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfax/1.0.0 of dependent libfix/1.0.0
            trace: collect_build_prerequisites: begin libfax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfuz/1.0.0 of dependent libfax/1.0.0
            trace: collect_build_prerequisites: end libfax/1.0.0
            trace: collect_build_prerequisites: end libfix/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: execute_plan: simulate: yes
            %.*
              new libfuz/1.0.0 (required by libfax, libfaz)
              new libfaz/1.0.0 (required by libfex, libfux)
              new libfex/1.0.0 (required by libfux)
              new libfux/1.0.0 (required by libfox)
              new libfox/1.0.0 (required by libbaz)
              new libbaz/1.0.0
              new libfax/1.0.0 (required by libfix)
              new libfix/1.0.0 (required by libfoo)
              new libfoo/1.0.0 (required by libbar)
              new libbar/1.0.0
            trace: execute_plan: simulate: no
            %.*
            EOE

            $pkg_status -r libbaz libbar >>EOO;
              !libbaz configured 1.0.0
                libfox configured 1.0.0 available 2.0.0 1.2.0
                  libfux configured 1.0.0 available 2.0.0
                    libfaz configured 1.0.0 available 2.0.0
                      libfuz configured 1.0.0 available 2.0.0
                    libfex configured 1.0.0 available 2.0.0
                      libfaz configured 1.0.0 available 2.0.0
                        libfuz configured 1.0.0 available 2.0.0
              !libbar configured 1.0.0
                libfoo configured 1.0.0 available 2.0.0
                  libfix configured 1.0.0 available 2.0.0
                    libfax configured 1.0.0 available 2.0.0
                      libfuz configured 1.0.0 available 2.0.0
              EOO

            $pkg_drop libbaz libbar
        }
      }

      : replace-dependency
      :
      {
        +$clone_cfg
        +$rep_add $rep/t4i && $rep_fetch

        : basics
        :
        : This test demonstrates a case when the dependency resolution
        : machinery resolves unsatisfied dependency constraints by adding the
        : package spec to the command line for an unsatisfactory dependency
        : version.
        :
        {
          $clone_cfg;

          $* libfox/1.1.0 libbaz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/2.1.0
            trace: collect_build: add libbox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbox/2.0.0 of dependent libbar/2.1.0
            trace: collect_build_prerequisites: begin libbox/2.0.0
            trace: collect_build: add libbax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/1.0.0 of dependent libbox/2.0.0
            trace: collect_build_prerequisites: begin libbax/1.0.0
            trace: collect_build_prerequisites: end libbax/1.0.0
            trace: collect_build_prerequisites: end libbox/2.0.0
            trace: collect_build_prerequisites: end libbar/2.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: postpone failure for dependent libbaz unsatisfied with dependency libbar/2.1.0 (< 2.1.0)
            trace: collect_build: pick libbar/2.1.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/2.1.0 with some other version
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/2.1.0 with 1.2.0 by adding package spec '?libbar == 1.2.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz
        }

        : reorder
        :
        : Similar to the above, but the order of the dependents on the command
        : line is swapped.
        :
        {
          $clone_cfg;

          $* libbaz libfox/1.1.0 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: add libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/0.1.0 (>= 1.0.0)
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/0.1.0 with some other version
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/0.1.0 with 1.2.0 by adding package spec '?libbar == 1.2.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: rep-postpone dependent libbaz/2.0.0 due to dependency libbar < 2.1.0 and user-specified constraint == 1.2.0
            trace: collect_build_prerequisites: postpone libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (0): collect rep-postponed libbaz/2.0.0
            trace: collect_build_prerequisites: resume libbaz/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz
        }

        : dependency
        :
        : Similar to the above, but the dependency is also specified on the
        : command line.
        :
        {
          $clone_cfg;

          $* libbaz libfox/1.1.0 '?libbar' 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/0.1.0 (>= 1.0.0)
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: libbar/0.1.0: update to libbar/1.2.0
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/0.1.0 (>= 1.0.0)
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build: libbar/0.1.0 package version needs to be replaced with libbar/1.2.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: apply version replacement for libbar/0.1.0
            trace: collect_build: replacement: libbar/1.2.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0 (required by libbaz, libfox)
              new libbaz/2.0.0
              new libfox/1.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz libbar
        }

        : dependency-constr
        :
        : Similar to the above, but also specify the version constraint.
        :
        {
          $clone_cfg;

          $* libbaz libfox/1.1.0 '?libbar < 3.0.0' 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/0.1.0 (>= 1.0.0)
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/0.1.0 with some other version
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/0.1.0 with 1.2.0 by overwriting constraint '?libbar < 3.0.0' -> '?libbar == 1.2.0' on command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: rep-postpone dependent libbaz/2.0.0 due to dependency libbar < 2.1.0 and user-specified constraint == 1.2.0
            trace: collect_build_prerequisites: postpone libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (0): collect rep-postponed libbaz/2.0.0
            trace: collect_build_prerequisites: resume libbaz/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0 (required by libbaz, libfox)
              new libbaz/2.0.0
              new libfox/1.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            libbar configured !1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              libbar configured !1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              libbar configured !1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz libbar
        }

        : to-hold
        :
        : Similar to the dependency test, but the dependency is specified as
        : build-to-hold.
        :
        {
          $clone_cfg;

          $* libbaz libfox/1.1.0 libbar 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build: libbar/2.1.0 package version needs to be replaced with libbar/0.1.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: apply version replacement for libbar/2.1.0
            trace: collect_build: replacement: libbar/0.1.0
            trace: collect_build: add libbar/0.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/0.1.0 (>= 1.0.0)
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: resume libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/0.1.0 with some other version
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/0.1.0 with 1.2.0 by adding constraint 'libbar' -> 'libbar == 1.2.0' on command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: resume libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: execute_plan: simulate: yes
            %.*
              new libbar/1.2.0
              new libbaz/2.0.0
              new libfox/1.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            !libbar configured 1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              !libbar configured 1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              !libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz libbar
        }

        : to-hold-constr
        :
        : Similar to the above, but also specify the version constraint.
        :
        {
          $clone_cfg;

          $* libbaz libfox/1.1.0 'libbar < 3.0.0' 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build: libbar/2.1.0 package version needs to be replaced with libbar/0.1.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: apply version replacement for libbar/2.1.0
            trace: collect_build: replacement: libbar/0.1.0
            trace: collect_build: add libbar/0.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: postpone failure for dependent libfox unsatisfied with dependency libbar/0.1.0 (>= 1.0.0)
            trace: collect_build: pick libbar/0.1.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: resume libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/0.1.0 with some other version
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/0.1.0 with 1.2.0 by overwriting constraint 'libbar < 3.0.0' -> 'libbar == 1.2.0' on command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: resume libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: execute_plan: simulate: yes
            %.*
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            !libbar configured !1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              !libbar configured !1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              !libbar configured !1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz libbar
        }

        : configured
        :
        : Similar to replace-dependency but the dependency is already configured
        : as built-to-hold.
        :
        {
          $clone_cfg;

          $* libbar 2>!;

          $* libfox/1.1.0 libbaz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: skip configured libbar/2.1.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: postpone failure for dependent libbaz unsatisfied with dependency libbar/2.1.0 (< 2.1.0)
            trace: collect_build: pick libbar/2.1.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/2.1.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/2.1.0 with some other version
            warning: package libbaz/2.0.0 dependency on (libbar < 2.1.0) is forcing downgrade of libbar/2.1.0 to 1.2.0
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/2.1.0 with 1.2.0 by adding package spec 'libbar == 1.2.0' to command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfox/1.1.0
            trace: collect_build: add libbaz/2.0.0
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: begin libfox/1.1.0
            trace: collect_build: pick libbar/1.2.0 over libbar/2.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libfox/1.1.0
            trace: collect_build_prerequisites: begin libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: collect_build_prerequisites: end libfox/1.1.0
            trace: collect_build_prerequisites: begin libbaz/2.0.0
            trace: collect_build: pick libbar/1.2.0 over libbar/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.2.0 of dependent libbaz/2.0.0
            trace: collect_build_prerequisites: end libbaz/2.0.0
            trace: collect_build_prerequisites: resume libbar/1.2.0
            trace: collect_build_prerequisites: end libbar/1.2.0
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: libbox/2.0.0: unused
            trace: pkg_build: refine package collection/plan execution
            trace: collect_drop: add libbox
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: libbax/1.0.0: unused
            trace: pkg_build: refine package collection/plan execution
            trace: collect_drop: overwrite libbox
            trace: collect_drop: add libbax
            trace: execute_plan: simulate: yes
            %.*
              drop libbax/1.0.0 (unused)
              drop libbox/2.0.0 (unused)
              downgrade libbar/1.2.0
              new libfox/1.1.0
              new libbaz/2.0.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -ar >>EOO;
            !libbar configured 1.2.0 available 2.1.0
            !libfox configured !1.1.0 available 2.0.0
              !libbar configured 1.2.0 available 2.1.0
            !libbaz configured 2.0.0
              !libbar configured 1.2.0 available 2.1.0
            EOO

          $pkg_drop libfox libbaz libbar
        }

        : unsatisfied-dependent
        :
        : Test that not being able to upgrade a dependency to a later version
        : which doesn't satisfy an existing dependent, we don't upgrade the
        : dependency.
        :
        {
          $clone_cfg;

          $* libfoo 2>!;

          $pkg_status -ar >>EOO;
            libbar configured 1.2.0 available 2.1.0
            !libfoo configured 2.0.0
              libbar configured 1.2.0 available 2.1.0
            EOO

          $* libbar 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbar/2.1.0
            trace: collect_build_prerequisites: skip unsatisfied existing dependent libfoo of dependency libbar/2.1.0 due to constraint (libbar == 1.2.0)
            trace: collect_build_prerequisites: begin libbar/2.1.0
            trace: collect_build: add libbox/2.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbox/2.0.0 of dependent libbar/2.1.0
            trace: collect_build_prerequisites: begin libbox/2.0.0
            trace: collect_build: add libbax/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbax/1.0.0 of dependent libbox/2.0.0
            trace: collect_build_prerequisites: begin libbax/1.0.0
            trace: collect_build_prerequisites: end libbax/1.0.0
            trace: collect_build_prerequisites: end libbox/2.0.0
            trace: collect_build_prerequisites: end libbar/2.1.0
            trace: collect_dependents: postpone failure for existing dependent libfoo unsatisfied with dependency libbar/2.1.0 (== 1.2.0)
            trace: execute_plan: simulate: yes
            %.*
            trace: pkg_build: try to replace unsatisfactory dependency libbar/2.1.0 with some other version
            trace: try_replace_dependency: replace unsatisfactory dependency version libbar/2.1.0 with 1.2.0 by adding constraint 'libbar' -> 'libbar == 1.2.0' on command line
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libbar/1.2.0
            trace: collect_build_prerequisites: skip configured libbar/1.2.0
            trace: execute_plan: simulate: yes
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_drop libfoo libbar
        }
      }
    }
  }

  : upgrade
  :
  : Test dependency upgrade using --immediate and --recursive options.
  :
  {
    test.arguments += --configure-only --upgrade

    +$clone_root_cfg
    +$rep_fetch $rep/t0a $rep/t0b $rep/t0c

    +$* libbar/0.0.2 libbaz/0.0.2 libfoo/0.0.1 --yes 2>>EOE
       fetched libfix/0.0.1
       unpacked libfix/0.0.1
       fetched libfoo/0.0.1
       unpacked libfoo/0.0.1
       fetched libbaz/0.0.2
       unpacked libbaz/0.0.2
       fetched libbar/0.0.2
       unpacked libbar/0.0.2
       configured libfix/0.0.1
       configured libfoo/0.0.1
       configured libbaz/0.0.2
       configured libbar/0.0.2
       EOE

    +$pkg_status -ar >>EOO
      libfix configured 0.0.1 available 0.0.3
      !libfoo configured !0.0.1 available 1.0.0
        libfix configured 0.0.1 available 0.0.3
      !libbaz configured !0.0.2 available 0.1.0 0.0.4 0.0.3
        !libfoo configured !0.0.1 available 1.0.0
          libfix configured 0.0.1 available 0.0.3
      !libbar configured !0.0.2 available 1.0.0 0.0.3
        !libbaz configured !0.0.2 available 0.1.0 0.0.4 0.0.3
          !libfoo configured !0.0.1 available 1.0.0
            libfix configured 0.0.1 available 0.0.3
      EOO

    clone_cfg = [cmdline] cp --no-cleanup -r ../cfg ./ &cfg/***

    : immediate
    :
    {
      $clone_cfg;

      $* libbar/0.0.3 --immediate --yes 2>>EOE;
        disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        fetched libbaz/0.1.0
        unpacked libbaz/0.1.0
        fetched libbar/0.0.3
        unpacked libbar/0.0.3
        configured libbaz/0.1.0
        configured libbar/0.0.3
        EOE

      $pkg_status libbar >'!libbar configured !0.0.3 available 1.0.0';
      $pkg_status libbaz >'!libbaz configured !0.1.0';
      $pkg_status libfoo >'!libfoo configured !0.0.1 available 1.0.0'
    }

    : recursive
    :
    {
      $clone_cfg;

      $* libbar/0.0.3 --recursive --yes 2>>EOE;
        disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbaz/0.1.0
        unpacked libbaz/0.1.0
        fetched libbar/0.0.3
        unpacked libbar/0.0.3
        configured libfoo/1.0.0
        configured libbaz/0.1.0
        configured libbar/0.0.3
        EOE

      $pkg_status libbar >'!libbar configured !0.0.3 available 1.0.0';
      $pkg_status libbaz >'!libbaz configured !0.1.0';
      $pkg_status libfoo >'!libfoo configured !1.0.0'
    }

    : all-held
    :
    {
      $clone_cfg;

      $* ?libfoo/0.0.1 ?libbaz/0.0.2; # Unhold.

      $* --upgrade --recursive <'y' 2>>EOE
          drop libfix/0.0.1 (unused)
          upgrade libfoo/1.0.0
          drop libbaz/0.0.2 (unused)
          upgrade libbar/1.0.0
        continue? [Y/n] disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        purged libbaz/0.0.2
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured libfoo/1.0.0
        configured libbar/1.0.0
        EOE
    }

    : prompt
    :
    {
      $clone_cfg;

      $* libbaz/0.0.2 --recursive <'y' 2>>EOE
          drop libfix/0.0.1 (unused)
          upgrade libfoo/1.0.0
          reconfigure libbaz/0.0.2
          reconfigure libbar (dependent of libbaz)
        continue? [Y/n] disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        configured libbaz/0.0.2
        configured libbar/0.0.2
        EOE
    }

    : override
    :
    {
      $clone_cfg;

      $* libbar/0.0.3 ?libbaz/0.0.3 --recursive --yes 2>>EOE;
        disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbaz/0.0.3
        unpacked libbaz/0.0.3
        fetched libbar/0.0.3
        unpacked libbar/0.0.3
        configured libfoo/1.0.0
        configured libbaz/0.0.3
        configured libbar/0.0.3
        EOE

      $pkg_status libbaz >'libbaz configured !0.0.3 available 0.1.0 0.0.4'
    }

    : unhold
    :
    {
      $clone_cfg;

      $* libbar/0.0.3 ?libbaz/0.0.3 ?libfoo --recursive --yes 2>>EOE;
        disfigured libbar/0.0.2
        disfigured libbaz/0.0.2
        disfigured libfoo/0.0.1
        disfigured libfix/0.0.1
        purged libfix/0.0.1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbaz/0.0.3
        unpacked libbaz/0.0.3
        fetched libbar/0.0.3
        unpacked libbar/0.0.3
        configured libfoo/1.0.0
        configured libbaz/0.0.3
        configured libbar/0.0.3
        EOE

      $pkg_status libbar >'!libbar configured !0.0.3 available 1.0.0';
      $pkg_status libbaz >'libbaz configured !0.0.3 available 0.1.0 0.0.4';
      $pkg_status libfoo >'libfoo configured 1.0.0'
    }

    : unavailable
    :
    : Test that the selected dependency (libfix/0.0.1) is silently left
    : unchanged if there is no package available from the dependents
    : repositories.
    :
    {
      $clone_cfg;
      $rep_remove $rep/t0a $rep/t0b $rep/t0c;

      $* libbar --recursive --yes
    }

    : unavailable-masked
    :
    : As above but using --mask-repository* instead of rep-remove.
    :
    {
      $clone_cfg;

      $* libbar --mask-repository $rep/t0a --mask-repository $rep/t0b \
                --mask-repository-uuid "$cfg_uuid=($rep/t0c)" --recursive --yes
    }

    -$pkg_drop libbar libbaz libfoo
  }

  : alternative
  :
  {
    +$clone_root_cfg && $rep_add $rep/t8a && $rep_fetch

    : multiple-dependencies
    :
    {
      $clone_cfg;

      $* foo --yes 2>>~%EOE%;
        fetched libbaz/1.1.0
        unpacked libbaz/1.1.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        fetched foo/1.0.0
        unpacked foo/1.0.0
        configured libbaz/1.1.0
        configured libbar/1.0.0
        configured foo/1.0.0
        %info: .+foo-1.0.0.+ is up to date%
        updated foo/1.0.0
        EOE

      $pkg_drop foo
    }

    : multiple-alts
    :
    {
      +$clone_cfg

      test.arguments += --yes --plan 'build plan:'

      : ambiguity
      :
      {
        $clone_cfg;

        $* fox 2>>EOE != 0
          error: unable to select dependency alternative for package fox/1.0.0
            info: explicitly specify dependency packages to manually select the alternative
            info: alternative: libbar
            info: alternative: libbaz
          info: while satisfying fox/1.0.0
          EOE
      }

      : reuse
      :
      {
        +$clone_cfg

        : specified-dep-build
        :
        {
          $clone_cfg;

          $* fox ?libbaz 2>>~%EOE%;
            build plan:
              new libbaz/1.1.0 (required by fox)
              new fox/1.0.0
                config.fox.backend=libbaz (set by fox)
            fetched libbaz/1.1.0
            unpacked libbaz/1.1.0
            fetched fox/1.0.0
            unpacked fox/1.0.0
            configured libbaz/1.1.0
            configured fox/1.0.0
            %info: .+fox-1.0.0.+ is up to date%
            updated fox/1.0.0
            EOE

          $pkg_drop fox
        }

        : hold-build
        :
        {
          $clone_cfg;

          $* fox libbaz 2>>~%EOE%;
            build plan:
              new libbaz/1.1.0
              new fox/1.0.0
                config.fox.backend=libbaz (set by fox)
            fetched libbaz/1.1.0
            unpacked libbaz/1.1.0
            fetched fox/1.0.0
            unpacked fox/1.0.0
            configured libbaz/1.1.0
            configured fox/1.0.0
            %info: .+libbaz-1.1.0.+ is up to date%
            %info: .+fox-1.0.0.+ is up to date%
            updated libbaz/1.1.0
            updated fox/1.0.0
            EOE

          $pkg_drop fox;
          $pkg_drop libbaz
        }

        : configured
        :
        {
          $clone_cfg;

          $* libbaz 2>!;

          $* fox 2>>~%EOE%;
            build plan:
              new fox/1.0.0
                config.fox.backend=libbaz (set by fox)
            fetched fox/1.0.0
            unpacked fox/1.0.0
            configured fox/1.0.0
            %info: .+fox-1.0.0.+ is up to date%
            updated fox/1.0.0
            EOE

          $pkg_drop fox;
          $pkg_drop libbaz
        }

        : fetched
        :
        {
          $clone_cfg;

          $pkg_fetch libbaz/1.0.0;

          $* fox 2>>~%EOE%;
            build plan:
              update libbaz/1.0.0 (required by fox)
              new fox/1.0.0
                config.fox.backend=libbaz (set by fox)
            unpacked libbaz/1.0.0
            fetched fox/1.0.0
            unpacked fox/1.0.0
            configured libbaz/1.0.0
            configured fox/1.0.0
            %info: .+fox-1.0.0.+ is up to date%
            updated fox/1.0.0
            EOE

          $pkg_drop fox
        }
      }

      : postpone
      :
      {
        +$clone_cfg

        : basic
        :
        {
          $clone_cfg;

          $* fox foo 2>>~%EOE%;
            build plan:
              new libbaz/1.1.0 (required by foo)
              new libbar/1.0.0 (required by foo, fox)
              new fox/1.0.0
                config.fox.backend=libbar (set by fox)
              new foo/1.0.0
            fetched libbaz/1.1.0
            unpacked libbaz/1.1.0
            fetched libbar/1.0.0
            unpacked libbar/1.0.0
            fetched fox/1.0.0
            unpacked fox/1.0.0
            fetched foo/1.0.0
            unpacked foo/1.0.0
            configured libbaz/1.1.0
            configured libbar/1.0.0
            configured fox/1.0.0
            configured foo/1.0.0
            %info: .+fox-1.0.0.+ is up to date%
            %info: .+foo-1.0.0.+ is up to date%
            updated fox/1.0.0
            updated foo/1.0.0
            EOE

          $pkg_drop fox;
          $pkg_drop foo
        }

        : pick-libbaz
        :
        {
          $clone_cfg;

          $* baz fox bar 2>>~%EOE%;
            build plan:
              new libbaz/1.1.0 (required by baz)
              new baz/1.0.0
              new libbar/1.0.0 (required by bar, fox)
              new fox/1.0.0
                config.fox.backend=libbar (set by fox)
              new bar/1.0.0
            fetched libbaz/1.1.0
            unpacked libbaz/1.1.0
            fetched baz/1.0.0
            unpacked baz/1.0.0
            fetched libbar/1.0.0
            unpacked libbar/1.0.0
            fetched fox/1.0.0
            unpacked fox/1.0.0
            fetched bar/1.0.0
            unpacked bar/1.0.0
            configured libbaz/1.1.0
            configured baz/1.0.0
            configured libbar/1.0.0
            configured fox/1.0.0
            configured bar/1.0.0
            %info: .+baz-1.0.0.+ is up to date%
            %info: .+fox-1.0.0.+ is up to date%
            %info: .+bar-1.0.0.+ is up to date%
            updated baz/1.0.0
            updated fox/1.0.0
            updated bar/1.0.0
            EOE

          cat cfg/fox-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.fox.backend = libbar
            %.*
            EOO

          $pkg_drop fox;
          $pkg_drop bar;
          $pkg_drop baz
        }
      }

      : reconfigure-dependent
      :
      {
        $clone_cfg;

        $* fox ?libbaz/1.0.0 2>>~%EOE%;
          build plan:
            new libbaz/1.0.0 (required by fox)
            new fox/1.0.0
              config.fox.backend=libbaz (set by fox)
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched fox/1.0.0
          unpacked fox/1.0.0
          configured libbaz/1.0.0
          configured fox/1.0.0
          %info: .+fox-1.0.0.+ is up to date%
          updated fox/1.0.0
          EOE

        $* ?libbaz 2>>~%EOE%;
          build plan:
            upgrade libbaz/1.1.0
            reconfigure fox (dependent of libbaz)
          disfigured fox/1.0.0
          disfigured libbaz/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          configured libbaz/1.1.0
          configured fox/1.0.0
          %info: .+fox-1.0.0.+ is up to date%
          updated fox/1.0.0
          EOE

        cat cfg/fox-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.fox.backend = libbaz
          %.*
          EOO

        $pkg_drop fox
      }

      : recreate-decision
      :
      {
        +$clone_cfg

        : reevaluate-alts
        :
        {
          +$clone_cfg

          : preserve
          :
          : Test that the existing libbox dependency is preserved even though
          : libbiz is more preferable as a dependency.
          :
          {
            $clone_cfg;

            $* box libbox 2>!;

            $* box +{ config.box.extras=true } ?libbiz 2>>~%EOE%;
              build plan:
                reconfigure/update box/1.0.0
                  config.box.extras=true (user configuration)
                  config.box.backend=libbox (set by box)
              disfigured box/1.0.0
              configured box/1.0.0
              %info: .+box-1.0.0.+ is up to date%
              updated box/1.0.0
              EOE

            $* box +{ config.box.extras=false } libbiz 2>>~%EOE%;
              build plan:
                reconfigure/update box/1.0.0
                  config.box.extras=false (user configuration)
                  config.box.backend=libbox (set by box)
                new libbiz/1.0.0
              disfigured box/1.0.0
              fetched libbiz/1.0.0
              unpacked libbiz/1.0.0
              configured box/1.0.0
              configured libbiz/1.0.0
              %info: .+box-1.0.0.+ is up to date%
              %info: .+libbiz-1.0.0.+ is up to date%
              updated box/1.0.0
              updated libbiz/1.0.0
              EOE

            $pkg_status -r box >>EOO;
              !box configured 1.0.0
                libbaz configured 1.1.0
                !libbox configured 1.0.0
              EOO

            cat cfg/box-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.box.backend = libbox
              %.*
              EOO

            $pkg_drop box;
            $pkg_drop libbox;
            $pkg_drop libbiz
          }

          : change-downgraded-dependency
          :
          : Test that libbiz is selected as a dependency since the existing
          : dependency decision cannot be preserved (libbox is downgraded to
          : 0.1.0 and becomes unsatisfactory for box).
          :
          {
            $clone_cfg;

            $* box libbox 2>!;

            $* box +{ config.box.extras=true } ?libbox/0.1.0 2>>~%EOE%;
              build plan:
                drop libbox/1.0.0 (unused)
                new libbiz/1.0.0 (required by box)
                reconfigure/update box/1.0.0
                  config.box.extras=true (user configuration)
                  config.box.backend=libbiz (set by box)
              disfigured box/1.0.0
              disfigured libbox/1.0.0
              purged libbox/1.0.0
              fetched libbiz/1.0.0
              unpacked libbiz/1.0.0
              configured libbiz/1.0.0
              configured box/1.0.0
              %info: .+box-1.0.0.+ is up to date%
              updated box/1.0.0
              EOE

            $pkg_status -r box >>EOO;
              !box configured 1.0.0
                libbaz configured 1.1.0
                libbiz configured 1.0.0
              EOO

            cat cfg/box-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.box.backend = libbiz
              %.*
              EOO

            $pkg_drop box
          }

          : change-downgraded-hold
          :
          : As above but libbox is downgraded to hold.
          :
          {
            $clone_cfg;

            $* box libbox 2>!;

            # While at it, test the reused-only alternative selection mode.
            # Also test the postponement of the 'unable to satisfy constraints
            # on package' failure.
            #
            $* box +{ config.box.extras=true } libbox/0.1.0 2>>EOE != 0;
              error: unable to satisfy constraints on package libbox
                info: command line depends on (libbox == 0.1.0)
                info: box/1.0.0 depends on (libbox >= 0.1.1)
                info: available libbox/0.1.0
                info: available libbox/1.0.0
                info: while satisfying box/1.0.0
                info: explicitly specify libbox version to manually satisfy both constraints
              EOE

            $* box +{ config.box.extras=true } libbox/0.1.0 ?libbiz 2>>~%EOE%;
              build plan:
                new libbiz/1.0.0 (required by box)
                downgrade libbox/0.1.0
                reconfigure/update box/1.0.0
                  config.box.extras=true (user configuration)
                  config.box.backend=libbiz (set by box)
              disfigured box/1.0.0
              disfigured libbox/1.0.0
              fetched libbiz/1.0.0
              unpacked libbiz/1.0.0
              fetched libbox/0.1.0
              unpacked libbox/0.1.0
              configured libbiz/1.0.0
              configured libbox/0.1.0
              configured box/1.0.0
              %info: .+libbox-0.1.0.+ is up to date%
              %info: .+box-1.0.0.+ is up to date%
              updated libbox/0.1.0
              updated box/1.0.0
              EOE

            $pkg_status -r box >>EOO;
              !box configured 1.0.0
                libbaz configured 1.1.0
                libbiz configured 1.0.0
              EOO

            cat cfg/box-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.box.backend = libbiz
              %.*
              EOO

            $pkg_drop box;
            $pkg_drop libbox
          }

          : postpone-unable-satisfy
          :
          : Similar to the above, but this time the postponement of the
          : 'unable to satisfy constraints on package' failure ends up with
          : downgrading of the unsatisfied dependent (bax).
          :
          {
            $clone_cfg;

            $* bax libbox 2>!;

            $* bax +{ config.bax.extras=true } libbox/0.1.0 bix 2>>~%EOE%;
              build plan:
                downgrade libbox/0.1.0
                downgrade bax/0.1.0
                  config.bax.extras=true (user configuration)
                  config.bax.backend=libbox (set by bax)
                new bix/1.0.0
              disfigured bax/1.0.0
              disfigured libbox/1.0.0
              fetched libbox/0.1.0
              unpacked libbox/0.1.0
              fetched bax/0.1.0
              unpacked bax/0.1.0
              fetched bix/1.0.0
              unpacked bix/1.0.0
              configured libbox/0.1.0
              configured bax/0.1.0
              configured bix/1.0.0
              %info: .+libbox-0.1.0.+ is up to date%
              %info: .+bax-0.1.0.+ is up to date%
              %info: .+bix-1.0.0.+ is up to date%
              updated libbox/0.1.0
              updated bax/0.1.0
              updated bix/1.0.0
              EOE

            $pkg_drop bix;
            $pkg_drop bax;
            $pkg_drop libbox
          }

          : postpone-unable-satisfy-dep
          :
          : Similar to the above, but the failure postponement ends up with
          : downgrading on the next dependency refinement iteration.
          :
          {
            $clone_cfg;

            $* bax libbox bux ?bix/0.1.0 2>!;

            $* bax +{ config.bax.extras=true } libbox/0.1.0 ?bix 2>>~%EOE%;
              build plan:
                downgrade libbox/0.1.0
                downgrade bax/0.1.0
                  config.bax.extras=true (user configuration)
                  config.bax.backend=libbox (set by bax)
                upgrade bix/1.0.0
                reconfigure bux (dependent of bix)
              disfigured bux/1.0.0
              disfigured bix/0.1.0
              disfigured bax/1.0.0
              disfigured libbox/1.0.0
              fetched libbox/0.1.0
              unpacked libbox/0.1.0
              fetched bax/0.1.0
              unpacked bax/0.1.0
              fetched bix/1.0.0
              unpacked bix/1.0.0
              configured libbox/0.1.0
              configured bax/0.1.0
              configured bix/1.0.0
              configured bux/1.0.0
              %info: .+libbox-0.1.0.+ is up to date%
              %info: .+bax-0.1.0.+ is up to date%
              %info: .+bux-1.0.0.+ is up to date%
              updated libbox/0.1.0
              updated bax/0.1.0
              updated bux/1.0.0
              EOE

            $pkg_drop bux;
            $pkg_drop bax;
            $pkg_drop libbox
          }
        }

        : reconfigure
        :
        {
          $clone_cfg;

          $* box ?libbiz/0.1.0 2>>~%EOE%;
            build plan:
              new libbox/1.0.0 (required by box)
              new libbaz/1.1.0 (required by box)
              new box/1.0.0
                config.box.backend=libbox (set by box)
            fetched libbox/1.0.0
            unpacked libbox/1.0.0
            fetched libbaz/1.1.0
            unpacked libbaz/1.1.0
            fetched box/1.0.0
            unpacked box/1.0.0
            configured libbox/1.0.0
            configured libbaz/1.1.0
            configured box/1.0.0
            %info: .+box-1.0.0.+ is up to date%
            updated box/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !box configured 1.0.0
              libbaz configured 1.1.0
              libbox configured 1.0.0
            EOO

          cat cfg/box-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.box.backend = libbox
            %.*
            EOO

          # Downgrade libbaz to reconfigure box and make sure we still keep
          # libbox as a prerequisite of box.
          #
          $* libbiz ?libbaz/1.0.0 2>>~%EOE%;
            build plan:
              new libbiz/1.0.0
              downgrade libbaz/1.0.0
              reconfigure box (dependent of libbaz)
            disfigured box/1.0.0
            disfigured libbaz/1.1.0
            fetched libbiz/1.0.0
            unpacked libbiz/1.0.0
            fetched libbaz/1.0.0
            unpacked libbaz/1.0.0
            configured libbiz/1.0.0
            configured libbaz/1.0.0
            configured box/1.0.0
            %info: .+libbiz-1.0.0.+ is up to date%
            %info: .+box-1.0.0.+ is up to date%
            updated libbiz/1.0.0
            updated box/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !box configured 1.0.0
              libbaz configured !1.0.0 available 1.1.0
              libbox configured 1.0.0
            !libbiz configured 1.0.0
            EOO

          cat cfg/box-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.box.backend = libbox
            %.*
            EOO

          # Make sure the decision is hold for downgraded dependency either.
          #
          $* ?libbox/0.1.1 2>>~%EOE%;
            build plan:
              downgrade libbox/0.1.1
              reconfigure box (dependent of libbox)
            disfigured box/1.0.0
            disfigured libbox/1.0.0
            fetched libbox/0.1.1
            unpacked libbox/0.1.1
            configured libbox/0.1.1
            configured box/1.0.0
            %info: .+box-1.0.0.+ is up to date%
            updated box/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !box configured 1.0.0
              libbaz configured !1.0.0 available 1.1.0
              libbox configured !0.1.1 available 1.0.0
            !libbiz configured 1.0.0
            EOO

          cat cfg/box-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.box.backend = libbox
            %.*
            EOO

          $pkg_drop box;
          $pkg_drop libbiz
        }
      }
    }

    : enable-condition
    :
    {
      +$cfg_create cxx $config_cxx -d cfg &cfg/***
      +$rep_add $rep/t8a && $rep_fetch

      test.arguments += --yes

      backend            = ($posix ? 'libbaz' : 'libbar')
      backend_dep        = ($posix ? 'libbaz/1.1.0' : 'libbar/1.0.0')
      backend_configured = ($posix ? 'libbaz configured 1.1.0' : 'libbar configured 1.0.0')

      : cxx-target
      :
      {
        $clone_cfg;

        $* fax 2>>~"%EOE%";
          fetched $backend_dep
          unpacked $backend_dep
          fetched fax/1.0.0
          unpacked fax/1.0.0
          configured $backend_dep
          configured fax/1.0.0
          %info: .+fax-1.0.0.+ is up to date%
          updated fax/1.0.0
          EOE

        $pkg_status -r >>"EOO";
          !fax configured 1.0.0
            $backend_configured
          EOO

        cat cfg/fax-1.0.0/build/config.build >>~"%EOO%";
          %.*
          config.fax.backend = $backend
          config.fax.libbiz = false
          %.*
          EOO

        $pkg_drop fax
      }

      : config-var
      :
      {
        $clone_cfg;

        $* config.fax.libbiz=true -- fax 2>>~"%EOE%";
          fetched $backend_dep
          unpacked $backend_dep
          fetched libbiz/1.0.0
          unpacked libbiz/1.0.0
          fetched fax/1.0.0
          unpacked fax/1.0.0
          configured $backend_dep
          configured libbiz/1.0.0
          configured fax/1.0.0
          %info: .+fax-1.0.0.+ is up to date%
          updated fax/1.0.0
          EOE

        $pkg_status -r >>"EOO";
          !fax configured 1.0.0
            $backend_configured
            libbiz configured 1.0.0
          EOO

        cat cfg/fax-1.0.0/build/config.build >>~"%EOO%";
          %.*
          config.fax.backend = $backend
          config.fax.libbiz = true
          %.*
          EOO

        $pkg_drop fax
      }

      : enable-indirect-dependency
      :
      {
        $clone_cfg;

        test.arguments += --plan "";

        $* dax 2>>~%EOE%;
            new libbaz/1.1.0 (required by dax)
            new dax/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          fetched dax/1.0.0
          unpacked dax/1.0.0
          configured libbaz/1.1.0
          configured dax/1.0.0
          %info: .+dax-1.0.0.+ is up to date%
          updated dax/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !dax configured 1.0.0
            libbaz configured 1.1.0
          EOO

        $* dix 2>>~%EOE%;
            new libbar/1.0.0 (required by dax)
            reconfigure/update dax/1.0.0 (required by dix)
              config.dax.extras=true (set by dix)
            new dix/1.0.0
          disfigured dax/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched dix/1.0.0
          unpacked dix/1.0.0
          configured libbar/1.0.0
          configured dax/1.0.0
          configured dix/1.0.0
          %info: .+dix-1.0.0.+ is up to date%
          updated dix/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !dax configured 1.0.0
            libbar configured 1.0.0
            libbaz configured 1.1.0
          !dix configured 1.0.0
            !dax configured 1.0.0
              libbar configured 1.0.0
              libbaz configured 1.1.0
          EOO

        $pkg_drop dax dix
      }

      : repoint-enable-indirect-dependency
      :
      {
        $clone_cfg;

        test.arguments += --plan "";

        $* dax dux ?dix/0.1.0 2>>~%EOE%;
            new libbaz/1.1.0 (required by dax)
            new dax/1.0.0
            new dix/0.1.0 (required by dux)
            new dux/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          fetched dax/1.0.0
          unpacked dax/1.0.0
          fetched dix/0.1.0
          unpacked dix/0.1.0
          fetched dux/1.0.0
          unpacked dux/1.0.0
          configured libbaz/1.1.0
          configured dax/1.0.0
          configured dix/0.1.0
          configured dux/1.0.0
          %info: .+dax-1.0.0.+ is up to date%
          %info: .+dux-1.0.0.+ is up to date%
          updated dax/1.0.0
          updated dux/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !dax configured 1.0.0
            libbaz configured 1.1.0
          !dux configured 1.0.0
            dix configured !0.1.0 available 1.0.0
          EOO

        $cfg_create -d cfg2 --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;
        $rep_add -d cfg2 $rep/t8a && $rep_fetch -d cfg2;

        $* libbaz +{ --config-name cfg2 } ?dix 2>>~%EOE%;
          %  new libbaz/1.1.0 \[cfg2.\]%
            drop libbaz/1.1.0 (unused)
            new libbar/1.0.0 (required by dax)
            reconfigure/update dax/1.0.0 (required by dix)
              config.dax.extras=true (set by dix)
            upgrade dix/1.0.0
            reconfigure dux (dependent of dix)
          disfigured dux/1.0.0
          disfigured dix/0.1.0
          disfigured dax/1.0.0
          disfigured libbaz/1.1.0
          %fetched libbaz/1.1.0 \[cfg2.\]%
          %unpacked libbaz/1.1.0 \[cfg2.\]%
          purged libbaz/1.1.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched dix/1.0.0
          unpacked dix/1.0.0
          %configured libbaz/1.1.0 \[cfg2.\]%
          configured libbar/1.0.0
          configured dax/1.0.0
          configured dix/1.0.0
          configured dux/1.0.0
          %info: .+libbaz-1.1.0.+ is up to date%
          %info: .+dux-1.0.0.+ is up to date%
          %updated libbaz/1.1.0 \[cfg2.\]%
          updated dux/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !dax configured 1.0.0
            libbar configured 1.0.0
            !libbaz [cfg2/] configured 1.1.0
          !dux configured 1.0.0
            dix configured 1.0.0
              !dax configured 1.0.0
                libbar configured 1.0.0
                !libbaz [cfg2/] configured 1.1.0
          EOO

        $pkg_drop dux;
        $pkg_drop dax
      }

      : reevaluate-alternatives
      :
      {
        +$clone_cfg

        : add-dependency
        :
        {
          $clone_cfg;

          $* fax 2>!;

          $pkg_status -r >>"EOO";
            !fax configured 1.0.0
              $backend_configured
            EOO

          $* config.fax.libbiz=true -- fax 2>>~%EOE%;
            disfigured fax/1.0.0
            fetched libbiz/1.0.0
            unpacked libbiz/1.0.0
            configured libbiz/1.0.0
            configured fax/1.0.0
            %info: .+fax-1.0.0.+ is up to date%
            updated fax/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fax configured 1.0.0
              $backend_configured
              libbiz configured 1.0.0
            EOO

          # While at it, tests that the dependency is properly removed.
          #
          $* config.fax.libbiz=false -- fax 2>>~%EOE%;
            disfigured fax/1.0.0
            disfigured libbiz/1.0.0
            purged libbiz/1.0.0
            configured fax/1.0.0
            %info: .+fax-1.0.0.+ is up to date%
            updated fax/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fax configured 1.0.0
              $backend_configured
            EOO

          $pkg_drop fax
        }

        : downgrade-dependency
        :
        {
          $clone_cfg;

          $* fux 2>!;

          $pkg_status -r >>"EOO";
            !fux configured 1.0.0
              libbiz configured 1.0.0
            EOO

          $* config.fux.libbiz_old=true -- fux 2>>~%EOE%;
            disfigured fux/1.0.0
            disfigured libbiz/1.0.0
            fetched libbiz/0.1.0
            unpacked libbiz/0.1.0
            configured libbiz/0.1.0
            configured fux/1.0.0
            %info: .+fux-1.0.0.+ is up to date%
            updated fux/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fux configured 1.0.0
              libbiz configured 0.1.0 available 1.0.0
            EOO

          # While at it, test that the dependency is properly upgraded.
          #
          # Note that, unless requested, libbiz is not upgraded, since 0.1.0
          # is still good for the selected alternative.
          #
          $* config.fux.libbiz_old=false -- fux 2>>~%EOE%;
            disfigured fux/1.0.0
            configured fux/1.0.0
            %info: .+fux-1.0.0.+ is up to date%
            updated fux/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fux configured 1.0.0
              libbiz configured 0.1.0 available 1.0.0
            EOO

          $* fux +{ config.fux.libbiz_old=false } ?libbiz 2>>~%EOE%;
            disfigured fux/1.0.0
            disfigured libbiz/0.1.0
            fetched libbiz/1.0.0
            unpacked libbiz/1.0.0
            configured libbiz/1.0.0
            configured fux/1.0.0
            %info: .+fux-1.0.0.+ is up to date%
            updated fux/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fux configured 1.0.0
              libbiz configured 1.0.0
            EOO

          $pkg_drop fux
        }
      }

      : external-package
      :
      if! $remote
      {
        +$clone_cfg

        +$tar -xzf $src/t8a/fax-1.0.0.tar.gz &fax-1.0.0/***
        +mv fax-1.0.0 fax

        : change-manifest
        :
        {
          $clone_cfg;
          cp -rp ../fax/ ./;

          $* config.fax.libbiz=true -- fax/ 2>>~"%EOE%";
            fetched $backend_dep
            unpacked $backend_dep
            fetched libbiz/1.0.0
            unpacked libbiz/1.0.0
            using fax/1.0.0 \(external\)
            configured $backend_dep
            configured libbiz/1.0.0
            configured fax/1.0.0
            %info: .+fax.+ is up to date%
            updated fax/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fax configured !1.0.0
              $backend_configured
              libbiz configured 1.0.0
            EOO

          cat cfg/fax/build/config.build >>~"%EOO%";
            %.*
            config.fax.backend = $backend
            config.fax.libbiz = true
            %.*
            EOO

          # Upgrade the external package after changing its manifest and make
          # sure the configuration is preserved.
          #
          echo '' >+fax/manifest;

          $* fax/ 2>>~%EOE%;
            disfigured fax/1.0.0
            using fax/1.0.0#1 (external)
            configured fax/1.0.0#1
            %info: .+fax.+ is up to date%
            updated fax/1.0.0#1
            EOE

          $pkg_status -r >>"EOO";
            !fax configured !1.0.0#1
              $backend_configured
              libbiz configured 1.0.0
            EOO

          cat cfg/fax/build/config.build >>~"%EOO%";
            %.*
            config.fax.backend = $backend
            config.fax.libbiz = true
            %.*
            EOO

          # While at it, test that it's ok for out root directory to not
          # exist.
          #
          # Note that this testing is only meaningful when we replace an
          # external package with another external (see
          # build_package::external() for details).
          #
          echo '' >+fax/manifest;

          rm -r cfg/fax/;

          $* fax/ 2>>~%EOE%;
            disfigured fax/1.0.0#1
            disfigured libbiz/1.0.0
            purged libbiz/1.0.0
            using fax/1.0.0#2 (external)
            configured fax/1.0.0#2
            %info: .+fax.+ is up to date%
            updated fax/1.0.0#2
            EOE

          $pkg_status -r >>"EOO";
            !fax configured !1.0.0#2
              $backend_configured
            EOO

          cat cfg/fax/build/config.build >>~"%EOO%";
            %.*
            config.fax.backend = $backend
            config.fax.libbiz = false
            %.*
            EOO

          # Also tests that the depends value location is printed on the
          # enable condition evaluation failure for an external package.
          #
          sed -i -e 's/(depends: libbiz).+/\1 ? (config.fax.libbiz = true)/' fax/manifest;

          $* fax/ 2>>~%EOE% != 0;
            <depends-enable-clause>:1: error: invalid bool value: multiple names
              info: enable condition: (config.fax.libbiz = true)
            %  fax.manifest:10:10: info: in depends manifest value defined here%
            info: while satisfying fax/1.0.0#3
            EOE

          $pkg_drop fax
        }

        : change-buildfile
        :
        {
          +$clone_cfg

          : package-directory
          :
          {
            $clone_cfg;
            cp -rp ../../fax/ ./;

            $* fax 2>>~"%EOE%";
              fetched $backend_dep
              unpacked $backend_dep
              fetched fax/1.0.0
              unpacked fax/1.0.0
              configured $backend_dep
              configured fax/1.0.0
              %info: .+fax-1.0.0.+ is up to date%
              updated fax/1.0.0
              EOE

            $pkg_status -r >>"EOO";
              !fax configured 1.0.0
                $backend_configured
              EOO

            # Iteration increment and upgrade after turning a package from the
            # archive-based repo into an external package.
            #
            $* fax/ 2>>~%EOE%;
              disfigured fax/1.0.0
              using fax/1.0.0#1 (external)
              configured fax/1.0.0#1
              %info: .+dir.fax.+ is up to date%
              updated fax/1.0.0#1
              EOE

            $pkg_status -r >>"EOO";
              !fax configured !1.0.0#1
                $backend_configured
              EOO

            # Further upgrade after the package' buildfile is edited.
            #
            echo '' >+fax/build/root.build;

            $* fax/ 2>>~%EOE%;
              disfigured fax/1.0.0#1
              using fax/1.0.0#2 (external)
              configured fax/1.0.0#2
              %info: .+fax.+ is up to date%
              updated fax/1.0.0#2
              EOE

            $pkg_status -r >>"EOO";
              !fax configured !1.0.0#2
                $backend_configured
              EOO

            # No upgrade if the buildfile is not edited.
            #
            $* fax/ 2>>~%EOE%;
              disfigured fax/1.0.0#2
              using fax/1.0.0#2 (external)
              configured fax/1.0.0#2
              %info: .+fax.+ is up to date%
              updated fax/1.0.0#2
              EOE

            $pkg_status -r >>"EOO";
              !fax configured !1.0.0#2
                $backend_configured
              EOO

            $pkg_drop fax
          }

          : directory-repo
          :
          {
            $clone_cfg;
            cp -rp ../../fax/ ./;

            $* fax 2>>~"%EOE%";
              fetched $backend_dep
              unpacked $backend_dep
              fetched fax/1.0.0
              unpacked fax/1.0.0
              configured $backend_dep
              configured fax/1.0.0
              %info: .+fax-1.0.0.+ is up to date%
              updated fax/1.0.0
              EOE

            $pkg_status -r >>"EOO";
              !fax configured 1.0.0
                $backend_configured
              EOO

            # Iteration increment and upgrade after turning a package from the
            # archive-based repo into an external package.
            #
            $rep_add --type dir fax/ && $rep_fetch;

            $* fax 2>>~%EOE%;
              disfigured fax/1.0.0
              using fax/1.0.0#1 (external)
              configured fax/1.0.0#1
              %info: .+dir.fax.+ is up to date%
              updated fax/1.0.0#1
              EOE

            $pkg_status -r >>"EOO";
              !fax configured 1.0.0#1
                $backend_configured
              EOO

            # Further upgrade after the package' buildfile is edited.
            #
            echo '' >+fax/build/root.build;

            $rep_fetch;

            $* fax 2>>~%EOE%;
              disfigured fax/1.0.0#1
              using fax/1.0.0#2 (external)
              configured fax/1.0.0#2
              %info: .+fax.+ is up to date%
              updated fax/1.0.0#2
              EOE

            $pkg_status -r >>"EOO";
              !fax configured 1.0.0#2
                $backend_configured
              EOO

            # No upgrade if the buildfile is not edited.
            #
            $rep_fetch;

            $* fax 2>>~%EOE%;
              %info: .+fax.+ is up to date%
              updated fax/1.0.0#2
              EOE

            $pkg_status -r >>"EOO";
              !fax configured 1.0.0#2
                $backend_configured
              EOO

            $pkg_drop fax
          }
        }

        : reconfigure-reflect-vars
        :
        {
          $clone_cfg;
          cp -rp ../fax/ ./;

          $* config.fax.libbiz=true -- fax/ 2>>~"%EOE%";
            fetched $backend_dep
            unpacked $backend_dep
            fetched libbiz/1.0.0
            unpacked libbiz/1.0.0
            using fax/1.0.0 \(external\)
            configured $backend_dep
            configured libbiz/1.0.0
            configured fax/1.0.0
            %info: .+fax.+ is up to date%
            updated fax/1.0.0
            EOE

          $pkg_status -r >>"EOO";
            !fax configured !1.0.0
              $backend_configured
              libbiz configured 1.0.0
            EOO

          cat cfg/fax/build/config.build >>~"%EOO%";
            %.*
            config.fax.backend = $backend
            config.fax.libbiz = true
            %config.fax.extras = '.+'%
            config.fax.libbox = false
            EOO

          # While at it, make sure none of the reflect variables are
          # unexpectedly wiped out on reconfiguration due to the dependency
          # upgrade.
          #
          $* fax/ "?sys:$backend/*" 2>>~"%EOE%";
            disfigured fax/1.0.0
            %disfigured $backend/.+%
            %purged $backend/.+%
            using fax/1.0.0 \(external\)
            configured sys:$backend/*
            configured fax/1.0.0
            %info: .+fax.+ is up to date%
            updated fax/1.0.0
            EOE

          $pkg_status -r >>~"%EOO%";
            !fax configured !1.0.0
            %  $backend configured,system .+%
              libbiz configured 1.0.0
            EOO

          cat cfg/fax/build/config.build >>~"%EOO%";
            %.*
            config.fax.backend = $backend
            config.fax.libbiz = true
            %config.fax.extras = '.+'%
            config.fax.libbox = false
            EOO

          # Now make sure that dependency clauses re-evaluation is properly
          # reflected in the configuration.
          #
          $* config.fax.libbiz=false -- fax/ 2>>~"%EOE%";
            disfigured fax/1.0.0
            disfigured libbiz/1.0.0
            purged libbiz/1.0.0
            using fax/1.0.0 \(external\)
            configured fax/1.0.0
            %info: .+fax.+ is up to date%
            updated fax/1.0.0
            EOE

          $pkg_status -r >>~"%EOO%";
            !fax configured !1.0.0
            %  $backend configured,system .+%
            EOO

          cat cfg/fax/build/config.build >>~"%EOO%";
            %.*
            config.fax.backend = $backend
            config.fax.libbiz = false
            config.fax.extras = [null]
            config.fax.libbox = false
            EOO

          $pkg_drop fax
        }
      }

      : evaluate-reflect-vars
      :
      {
        $clone_cfg;

        $* config.fax.libbox=true config.fax.libbiz=true -- fax 2>!;

        if $posix
          $pkg_status -r >>EOO
            !fax configured 1.0.0
              libbaz configured 1.1.0
              libbiz configured 1.0.0
              libbox configured 1.0.0
            EOO
        else
          $pkg_status -r >>EOO
            !fax configured 1.0.0
              libbar configured 1.0.0
              libbiz configured 1.0.0
            EOO
        end;

        $pkg_drop fax
      }
    }

    : reconfigure-dependent
    :
    : Test some cases when a dependent needs to be reconfigured due to an
    : upgraded dependency.
    :
    {
      +$clone_cfg

      test.arguments += --yes

      : keep-alternative
      :
      {
        $clone_cfg;

        $* tax ?libfoo/1.0.0 2>!;

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        $* --upgrade --recursive 2>!; # Noop.

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        $* ?libfoo 2>!;               # Noop.

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        $* ?libfoo/2.0.0 2>>EOE != 0;
          error: package libfoo doesn't satisfy its dependents
            info: libfoo/2.0.0 doesn't satisfy tax/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        $pkg_drop tax
      }

      : re-evaluate-dependent
      :
      {
        $clone_cfg;

        $* tex ?libfoo/1.0.0 2>!;

        $pkg_status -r >>EOO;
          !tex configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        cat cfg/tex-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tex.libfoo_protocol = 1
          %.*
          EOO

        # @@ Strangely, if upgrade with -ur instead of ?libfoo, then status
        #    prints 'libfoo configured !2.0.0' instead of
        #    'libfoo configured 2.0.0'.
        #
        $* ?libfoo 2>>~%EOE%;
          disfigured tex/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/2.0.0
          unpacked libfoo/2.0.0
          configured libfoo/2.0.0
          configured tex/1.0.0
          %info: .+tex-1.0.0.+ is up to date%
          updated tex/1.0.0
          EOE

        cat cfg/tex-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tex.libfoo_protocol = 2
          %.*
          EOO

        $pkg_status -r >>EOO;
          !tex configured 1.0.0
            libfoo configured 2.0.0
          EOO

        $pkg_drop tex
      }

      : re-evaluate-reflect
      :
      {
        $clone_cfg;

        # @@ The fact that `$* tix` fails as follows but `$* tix ?libfoo`
        #    doesn't looks confusing:
        #
        #    error: unable to select dependency alternative for package tix/1.0.0
        #      info: explicitly specify dependency packages to manually select the alternative
        #      info: alternative: libfoo
        #      info: alternative: libfoo
        #    info: while satisfying tix/1.0.0
        #
        #    Note:
        #
        #    tix -> libfoo>=2.0.0 reflect{...} | libfoo>=1.0.0 reflect{...}
        #
        $* tix ?libfoo/1.0.0 2>!;

        $pkg_status -r >>EOO;
          !tix configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        cat cfg/tix-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tix.reflect = 1
          %.*
          EOO

        $* ?libfoo 2>>~%EOE%;
          disfigured tix/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/2.0.0
          unpacked libfoo/2.0.0
          configured libfoo/2.0.0
          configured tix/1.0.0
          %info: .+tix-1.0.0.+ is up to date%
          updated tix/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !tix configured 1.0.0
            libfoo configured 2.0.0
          EOO

        cat cfg/tix-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tix.reflect = 2
          %.*
          EOO

        $pkg_drop tix
      }

      : select-alt-with-reflect
      :
      {
        $clone_cfg;

        $* tox ?libfoo/1.0.0 2>!;

        $pkg_status -r >>EOO;
          !tox configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        cat cfg/tox-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tox.libfoo_protocol = '1 or 2'
          %.*
          EOO

        $* ?libfoo 2>>~%EOE%;
          disfigured tox/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/2.0.0
          unpacked libfoo/2.0.0
          configured libfoo/2.0.0
          configured tox/1.0.0
          %info: .+tox-1.0.0.+ is up to date%
          updated tox/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !tox configured 1.0.0
            libfoo configured 2.0.0
          EOO

        cat cfg/tox-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tox.libfoo_protocol = 2
          %.*
          EOO

        $pkg_drop tox
      }

      : re-evaluate-from
      :
      {
        +$clone_cfg

        : earlier-depends
        :
        {
          $clone_cfg;

          $* tux ?libbox/0.1.0 2>!;

          $pkg_status -r >>EOO;
            !tux configured 1.0.0
              libbox configured !0.1.0 available 1.0.0 0.1.1
              libfoo configured 2.0.0
            EOO

          cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.protocol = 1
            %.*
            EOO

          $* ?libbox 2>>~%EOE%;
            disfigured tux/1.0.0
            disfigured libbox/0.1.0
            fetched libbox/1.0.0
            unpacked libbox/1.0.0
            configured libbox/1.0.0
            configured tux/1.0.0
            %info: .+tux-1.0.0.+ is up to date%
            updated tux/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !tux configured 1.0.0
              libbox configured 1.0.0
              libfoo configured 2.0.0
            EOO

          cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.protocol = 1
            %.*
            EOO

          $pkg_drop tux
        }

        : later-depends
        :
        {
          $clone_cfg;

          $* twx ?libbiz/0.1.0 2>!;

          $pkg_status -r >>EOO;
            !twx configured 1.0.0
              libbiz configured !0.1.0 available 1.0.0
              libbox configured 1.0.0
              libfoo configured 2.0.0
            EOO

          cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.protocol = 1
            %.*
            EOO

          $* ?libbiz 2>>~%EOE%;
            disfigured twx/1.0.0
            disfigured libbiz/0.1.0
            fetched libbiz/1.0.0
            unpacked libbiz/1.0.0
            configured libbiz/1.0.0
            configured twx/1.0.0
            %info: .+twx-1.0.0.+ is up to date%
            updated twx/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !twx configured 1.0.0
              libbiz configured 1.0.0
              libbox configured 1.0.0
              libfoo configured 2.0.0
            EOO

          cat cfg/libfoo-2.0.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.protocol = 1
            %.*
            EOO

          $pkg_drop twx
        }

        : same-depends
        :
        {
          $clone_cfg;

          $* tvx ?libfoo/1.0.0 2>!;

          $pkg_status -r >>EOO;
            !tvx configured 1.0.0
              libfoo configured !1.0.0 available 2.0.0
              libfox configured 1.0.0
            EOO

          cat cfg/libfox-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.libfox.level = 1
            %.*
            EOO

          $* ?libfoo 2>>~%EOE%;
            disfigured tvx/1.0.0
            disfigured libfoo/1.0.0
            disfigured libfox/1.0.0
            fetched libfoo/2.0.0
            unpacked libfoo/2.0.0
            configured libfox/1.0.0
            configured libfoo/2.0.0
            configured tvx/1.0.0
            %info: .+tvx-1.0.0.+ is up to date%
            updated tvx/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !tvx configured 1.0.0
              libfoo configured 2.0.0
              libfox configured 1.0.0
            EOO

          cat cfg/libfox-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.libfox.level = 2
            %.*
            EOO

          $pkg_drop tvx
        }
      }

      : change-alternative
      :
      {
        $clone_cfg;

        $* tpx ?libfoo/1.0.0 2>!;

        $pkg_status -r >>EOO;
          !tpx configured 1.0.0
            libfoo configured !1.0.0 available 2.0.0
          EOO

        cat cfg/tpx-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tpx.libfoo_protocol = 1
          %.*
          EOO

        $* ?libfoo 2>>~%EOE%;
          disfigured tpx/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/2.0.0
          unpacked libfoo/2.0.0
          configured libfoo/2.0.0
          configured tpx/1.0.0
          %info: .+tpx-1.0.0.+ is up to date%
          updated tpx/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !tpx configured 1.0.0
            libfoo configured 2.0.0
          EOO

        cat cfg/tpx-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tpx.libfoo_protocol = 2
          %.*
          EOO

        $pkg_drop tpx
      }

      : fail-change-unsatisfactory-alternative
      :
      {
        $clone_cfg;

        $* tpx ?libfoo 2>!;

        $pkg_status -r >>EOO;
          !tpx configured 1.0.0
            libfoo configured 2.0.0
          EOO

        cat cfg/tpx-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.tpx.libfoo_protocol = 2
          %.*
          EOO

        $* tax 2>>EOE != 0;
          error: unable to downgrade package libfoo/2.0.0 to 1.0.0
            info: because configured package tpx/1.0.0 depends on (libfoo >= 2.0.0)
            info: package libfoo/1.0.0 required by
                    tax/1.0.0 (libfoo == 1.0.0)
            info: re-run with -v for additional dependency information
            info: consider re-trying with --upgrade|-u potentially combined with --recursive|-r
            info: or explicitly request up/downgrade of package tpx
            info: or explicitly specify package libfoo version to manually satisfy these constraints
          EOE

        # @@ Note that the above advises doesn't really work here since the
        #    tpx package is not re-collected recursively. We should probably
        #    invent the package-specific --rebuild option to re-collect a
        #    configured package.
        #
        $* tax tpx ?libfoo/1.0.0 2>>EOE != 0;
          error: unable to downgrade package libfoo/2.0.0 to 1.0.0
            info: because configured package tpx/1.0.0 depends on (libfoo >= 2.0.0)
            info: re-run with -v for additional dependency information
            info: consider re-trying with --upgrade|-u potentially combined with --recursive|-r
            info: or explicitly request up/downgrade of package tpx
            info: or explicitly specify package libfoo version to manually satisfy these constraints
          EOE

        $pkg_drop tpx
      }
    }
  }

  : version-replacement
  :
  {
    +$clone_root_cfg && $rep_add $rep/t12b && $rep_fetch

    test.arguments += --yes

    : not-replaced
    :
    {
      $clone_cfg;

      $* bar foo 2>!;

      $pkg_status -r >>EOO;
        !bar configured 1.0.0
          libbar configured 0.1.0 available 1.0.0
            libbaz configured 1.0.0
        !foo configured 1.0.0
          libbar configured 0.1.0 available 1.0.0
            libbaz configured 1.0.0
        EOO

      $pkg_drop bar foo
    }

    : replaced-scratch
    :
    : Test that changing package order on the command line does not result
    : in a sub-optimal choice of the libbaz version (0.1.0).
    :
    : Note that this was not the case until we implemented the builds
    : re-collection on the package version change.
    :
    {
      $clone_cfg;

      $* foo bar --verbose 5 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: add foo/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: collect_build_prerequisites: begin foo/1.0.0
        %.*
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent foo/1.0.0
        trace: collect_build_prerequisites: begin libbar/1.0.0
        %.*
        trace: collect_build: add libbaz/0.1.0
        trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.1.0 of dependent libbar/1.0.0
        trace: collect_build_prerequisites: begin libbaz/0.1.0
        trace: collect_build_prerequisites: end libbaz/0.1.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_prerequisites: begin bar/1.0.0
        %.*
        trace: collect_build: pick libbar/0.1.0 over libbar/1.0.0
        trace: collect_build: libbar/1.0.0 package version needs to be replaced with libbar/0.1.0
        trace: pkg_build: collection failed due to package version replacement, retry from scratch
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: add foo/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: collect_build_prerequisites: begin foo/1.0.0
        %.*
        trace: collect_build: apply version replacement for libbar/1.0.0
        trace: collect_build: replacement: libbar/0.1.0
        trace: collect_build: add libbar/0.1.0
        trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent foo/1.0.0
        trace: collect_build_prerequisites: begin libbar/0.1.0
        %.*
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.0.0 of dependent libbar/0.1.0
        trace: collect_build_prerequisites: begin libbaz/1.0.0
        trace: collect_build_prerequisites: end libbaz/1.0.0
        trace: collect_build_prerequisites: end libbar/0.1.0
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_prerequisites: begin bar/1.0.0
        %.*
        trace: collect_build_prerequisites: no cfg-clause for dependency libbar/0.1.0 of dependent bar/1.0.0
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: execute_plan: simulate: yes
        %.*
        EOE

      $pkg_status -r >>EOO;
        !foo configured 1.0.0
          libbar configured 0.1.0 available 1.0.0
            libbaz configured 1.0.0
        !bar configured 1.0.0
          libbar configured 0.1.0 available 1.0.0
            libbaz configured 1.0.0
        EOO

      $pkg_drop foo bar
    }

    : replaced-inplace
    :
    : Test the version replacement optimization. Here libbaz/1.0.0 get
    : replaced with 0.1.0 but without re-collection from scratch since it
    : does not have any dependencies.
    :
    : Note that the inplace replacement has been disabled for now (see
    : build_packages::collect_build() for details).
    :
    {
      $clone_cfg && $rep_add $rep/t12a && $rep_fetch;

#\
      $* libbaz libbar --verbose 5 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: begin libbaz/1.0.0
        %.*
        trace: collect_build_prerequisites: end libbaz/1.0.0
        trace: collect_build_prerequisites: begin libbar/1.0.0
        %.*
        trace: collect_build: pick libbaz/0.1.0 over libbaz/1.0.0
        trace: collect_build: libbaz/1.0.0 package version needs to be replaced in-place with libbaz/0.1.0
        trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.1.0 of dependent libbar/1.0.0
        trace: collect_build_prerequisites: begin libbaz/0.1.0
        trace: collect_build_prerequisites: end libbaz/0.1.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: execute_plan: simulate: yes
        %.*
        EOE
#\

      $* libbaz libbar --verbose 5 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: begin libbaz/1.0.0
        %.*
        trace: collect_build_prerequisites: end libbaz/1.0.0
        trace: collect_build_prerequisites: begin libbar/1.0.0
        %.*
        trace: collect_build: pick libbaz/0.1.0 over libbaz/1.0.0
        trace: collect_build: libbaz/1.0.0 package version needs to be replaced with libbaz/0.1.0
        trace: pkg_build: collection failed due to package version replacement, retry from scratch
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: apply version replacement for libbaz/1.0.0
        trace: collect_build: replacement: libbaz/0.1.0
        trace: collect_build: add libbaz/0.1.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: begin libbaz/0.1.0
        trace: collect_build_prerequisites: end libbaz/0.1.0
        trace: collect_build_prerequisites: begin libbar/1.0.0
        %.*
        trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/0.1.0 of dependent libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: execute_plan: simulate: yes
        %.*
        EOE

      $pkg_status -r >>EOO;
        !libbaz configured 0.1.0 available 1.0.0
        !libbar configured 1.0.0
          !libbaz configured 0.1.0 available 1.0.0
        EOO

      $pkg_drop libbaz libbar
    }
  }

  : drop-dependent
  :
  {
    +$clone_root_cfg && $rep_add $rep/t12b && $rep_fetch

    test.arguments += --yes

    : unhold
    :
    : Test that the being dropped dependent does not constrain a dependency
    : anymore.
    :
    {
      $clone_cfg;

      $* libbar 2>!;

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
          libbaz configured 0.1.0 available [1.0.0]
        EOO

      $* baz/0.1.0 ?libbar ?libbaz 2>!;

      $pkg_status -r >>EOO;
        !baz configured !0.1.0 available 1.0.0
          libbaz configured 1.0.0
        EOO

      $pkg_drop baz
    }

    : unuse
    :
    : Unlike the previous test, at the time we check the constraint applied
    : by libbar on libbaz (== 0.1.0) there is no evidence that libbar will be
    : dropped, which will happen some later execution plan refinement
    : iteration.
    :
    {
      $clone_cfg;

      $* foo 2>!;

      $pkg_status -r >>EOO;
        !foo configured 1.0.0
          libbar configured 1.0.0
            libbaz configured 0.1.0 available [1.0.0]
        EOO

      $* baz foo/0.1.0 2>!;

      $pkg_status -r >>EOO;
        !foo configured !0.1.0 available 1.0.0
        !baz configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $pkg_drop baz foo
    }
  }

  : config-negotiation-order
  :
  {
    +$clone_root_cfg && $rep_add $rep/t11a && $rep_fetch

    test.arguments += --yes --plan='build plan:' --verbose 5 --build-option --quiet

    # Note that on some platforms matching bpkg's stderr using a regular
    # expression which contains too may '%.*' lines ends up with the
    # regex_error exception with the error_complexity code. To fix that we
    # pipe bpkg's stderr through the sed-based pipeline filtering the stream
    # content and simplify the stderr-matching regular expressions.
    #
    filter = [cmdline] sed -e "'"'s/^mkdir -p .*//'"'" | \
                       sed -n -e "'"'s/(.+)/\1/p'"'" >&2

    : initial-collection
    :
    {
      +$clone_cfg

      : postpone
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  foo: depends: libfoo(c)
        #
        #  fox: depends: libfoo(c)
        #
        #  fux: depends: libfoo
        #
        $* foo fox fux 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/1.0.0
          trace: collect_build: add fux/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/1.0.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone fox/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0 since already in cluster {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fox/1.0.0
          trace: collect_build_prerequisites: resume fox/1.0.0
          trace: collect_build_prerequisites: end fox/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo fox | libfoo->{foo/1,1 fox/1,1}}!
          trace: collect_build_postponed (1): end {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            new libfoo/1.0.0 (required by foo, fox, fux)
              config.libfoo.extras=true (set by foo)
            new foo/1.0.0
              config.foo.libfoo_extras=true (set by foo)
            new fox/1.0.0
              config.fox.libfoo_extras=true (set by fox)
            new fux/1.0.0
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !fox configured 1.0.0
            libfoo configured 1.0.0
          !fux configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop foo fox fux
      }

      : postpone-system
      :
      {
        $clone_cfg;

        $* foo fox '?sys:libfoo/*' 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency sys:libfoo/* of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency sys:libfoo/* of dependent fox/1.0.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone fox/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip system sys:libfoo/*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fox/1.0.0
          trace: collect_build_prerequisites: resume fox/1.0.0
          trace: collect_build_prerequisites: end fox/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo fox | libfoo->{foo/1,1 fox/1,1}}!
          trace: collect_build_postponed (1): end {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            configure sys:libfoo/* (required by foo, fox)
              config.libfoo.extras=true (expected by foo)
            new foo/1.0.0
              config.foo.libfoo_extras=true (set by foo)
            new fox/1.0.0
              config.fox.libfoo_extras=true (set by fox)
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libfoo configured,system !* available 1.0.0 0.1.0
          !fox configured 1.0.0
            libfoo configured,system !* available 1.0.0 0.1.0
          EOO

        $pkg_drop foo fox
      }

      : postpone-merge
      :
      {
        $clone_cfg;

        $* foo bar baz 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add bar/1.0.0
          trace: collect_build: add baz/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin bar/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
          trace: postponed_configurations::add: create {bar | libbar->{bar/1,1}}
          trace: collect_build_prerequisites: postpone bar/1.0.0
          trace: collect_build_prerequisites: begin baz/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent baz/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent baz/1.0.0
          trace: postponed_configurations::add: add {baz 1,1: libbar libfoo} to {foo | libfoo->{foo/1,1}}
          trace: postponed_configurations::add: merge {bar | libbar->{bar/1,1}} into {baz foo | libfoo->{baz/1,1 foo/1,1} libbar->{baz/1,1}}
          trace: collect_build_prerequisites: postpone baz/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {bar baz foo | libfoo->{baz/1,1 foo/1,1} libbar->{bar/1,1 baz/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {bar baz foo | libfoo->{baz/1,1 foo/1,1} libbar->{bar/1,1 baz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/1.0.0
          trace: collect_build_prerequisites: resume bar/1.0.0
          trace: collect_build_prerequisites: end bar/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
          trace: collect_build_prerequisites: resume baz/1.0.0
          trace: collect_build_prerequisites: end baz/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {bar baz foo | libfoo->{baz/1,1 foo/1,1} libbar->{bar/1,1 baz/1,1}}!
          trace: collect_build_postponed (1): end {bar baz foo | libfoo->{baz/1,1 foo/1,1} libbar->{bar/1,1 baz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            new libfoo/1.0.0 (required by baz, foo)
              config.libfoo.extras=true (set by baz)
            new foo/1.0.0
              config.foo.libfoo_extras=true (set by foo)
            new libbar/1.0.0 (required by bar, baz)
              config.libbar.extras=true (set by bar)
            new bar/1.0.0
            new baz/1.0.0
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !bar configured 1.0.0
            libbar configured 1.0.0
          !baz configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop foo bar baz
      }

      : postpone-dependency-dependent
      :
      {
        $clone_cfg;

        $* fex 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fex/1.0.0
          trace: collect_build_prerequisites: begin fex/1.0.0
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency foo/1.0.0 of dependent fex/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fex/1.0.0
          trace: postponed_configurations::add: add {fex 2,1: libfoo} to {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone fex/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fex foo | libfoo->{fex/2,1 foo/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {fex foo | libfoo->{fex/2,1 foo/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fex/1.0.0
          trace: collect_build_prerequisites: resume fex/1.0.0
          trace: collect_build_prerequisites: end fex/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {fex foo | libfoo->{fex/2,1 foo/1,1}}!
          trace: collect_build_postponed (1): end {fex foo | libfoo->{fex/2,1 foo/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !fex configured 1.0.0
            foo configured 1.0.0
              libfoo configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop fex
      }

      : reconf-existing-dept
      :
      {
        +$clone_cfg

        : no-build-clause
        :
        {
          +$clone_cfg

          : no-config
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  fex: depends: fux(c)
            #
            #  fux: depends: libfoo
            #
            $* fex/0.1.0 fux libfoo 2>!;

            $pkg_status -r >>EOO;
              !libfoo configured 1.0.0
              !fux configured 1.0.0
                !libfoo configured 1.0.0
              !fex configured !0.1.0 available 1.0.0
                !fux configured 1.0.0
                  !libfoo configured 1.0.0
              EOO

            cat cfg/fux-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            $* libfoo/0.1.0 2>!;

            $pkg_status -r >>EOO;
              !libfoo configured !0.1.0 available 1.0.0
              !fux configured 1.0.0
                !libfoo configured !0.1.0 available 1.0.0
              !fex configured !0.1.0 available 1.0.0
                !fux configured 1.0.0
                  !libfoo configured !0.1.0 available 1.0.0
              EOO

            cat cfg/fux-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            $pkg_drop fex fux libfoo
          }

          : dept-upgrade
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  fux: depends: libfoo ?
            #
            $* fux/0.1.0 +{ config.fux.extras=true } 2>!;

            $pkg_status -r >>EOO;
              !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                libfoo configured 1.0.0
              EOO

            cat cfg/fux-0.1.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            $* fux/0.1.1 2>!;

            $pkg_status -r >>EOO;
              !fux configured !0.1.1 available 1.0.0 0.2.0
                libfoo configured 1.0.0
              EOO

            cat cfg/fux-0.1.1/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            $pkg_drop fux
          }

          : dept-depc
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  fux: depends: libfoo
            #
            $* fux +{ config.fux.extras=true } ?libfoo +{ config.libfoo.extras=true } 2>!;

            $pkg_status -r >>EOO;
              !fux configured 1.0.0
                libfoo configured 1.0.0
              EOO

            cat cfg/fux-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            cat cfg/libfoo-1.0.0/build2/config.build2 >>~%EOO%;
              %.*
              config.libfoo.extras = true
              config.libfoo.network = false
              %.*
              EOO

            $* ?libfoo/0.1.0 2>!;

            $pkg_status -r >>EOO;
              !fux configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              EOO

            cat cfg/fux-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
              %.*
              config.libfoo.extras = true
              EOO

            $pkg_drop fux
          }

          : dept-depc-no-plan
          :
          : As above but the configuration is not printed (as a part of the
          : plan) before the plan execution.
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  fux: depends: libfoo
            #
            $* fux +{ config.fux.extras=true } ?libfoo +{ config.libfoo.extras=true } 2>!;

            $pkg_status -r >>EOO;
              !fux configured 1.0.0
                libfoo configured 1.0.0
              EOO

            cat cfg/fux-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            cat cfg/libfoo-1.0.0/build2/config.build2 >>~%EOO%;
              %.*
              config.libfoo.extras = true
              config.libfoo.network = false
              EOO

            test.arguments = $regex.filter_out_match($test.arguments, '--plan=.*');

            $* ?libfoo/0.1.0 2>!;

            $pkg_status -r >>EOO;
              !fux configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              EOO

            cat cfg/fux-1.0.0/build/config.build >>~%EOO%;
              %.*
              config.fux.extras = true
              config.fux.network = false
              %.*
              EOO

            cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
              %.*
              config.libfoo.extras = true
              EOO

            $pkg_drop fux
          }
        }

        : enabled-clause
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  fex: depends: fux(c)
          #
          #  fux: depends: libfoo ?
          #
          $* fex/0.1.0 fux/0.1.0 2>!;

          $pkg_status -r >>EOO;
            !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
              libfoo configured 1.0.0
            !fex configured !0.1.0 available 1.0.0
              !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                libfoo configured 1.0.0
            EOO

          cat cfg/fux-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.fux.extras = true
            config.fux.network = false
            %.*
            EOO

          $* ?libfoo/0.1.0 2>!;

          $pkg_status -r >>EOO;
            !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
              libfoo configured !0.1.0 available 1.0.0
            !fex configured !0.1.0 available 1.0.0
              !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                libfoo configured !0.1.0 available 1.0.0
            EOO

          cat cfg/fux-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.fux.extras = true
            config.fux.network = false
            %.*
            EOO

          $pkg_drop fex fux
        }

        : require-clause
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  fex: depends: fux(c)
          #
          #  fux: depends: libfoo(c) ?
          #
          $* fex/0.1.0 fux/0.2.0 2>!;

          $pkg_status -r >>EOO;
            !fux configured !0.2.0 available 1.0.0
              libfoo configured 1.0.0
            !fex configured !0.1.0 available 1.0.0
              !fux configured !0.2.0 available 1.0.0
                libfoo configured 1.0.0
            EOO

          cat cfg/fux-0.2.0/build/config.build >>~%EOO%;
            %.*
            config.fux.extras = true
            config.fux.network = false
            %.*
            EOO

          cat cfg/libfoo-1.0.0/build2/config.build2 >>~%EOO%;
            %.*
            config.libfoo.extras = true
            config.libfoo.network = false
            %.*
            EOO

          $* ?libfoo/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: execute_plan: simulate: yes
            trace: evaluate_dependency: libfoo/1.0.0: update to libfoo/0.1.0
            trace: pkg_build: refine package collection/plan execution
            trace: collect_build_prerequisites: pre-reeval fux/0.2.0
            trace: collect_build_prerequisites: pre-reevaluated fux/0.2.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of existing dependent fux/0.2.0 due to dependency libfoo/0.1.0
            trace: collect_build: add fux/0.2.0
            trace: postponed_configurations::add: create {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: pre-reeval fux/0.2.0
            trace: collect_build_prerequisites: pre-reevaluated fux/0.2.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: reeval fux/0.2.0
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: postponed_configurations::add: add {fux^ 1,1: libfoo} to {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent fux/0.2.0 results in {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: re-evaluated fux/0.2.0
            trace: collect_build_postponed (1): cfg-negotiate begin {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fux/0.2.0
            trace: collect_build_prerequisites: resume fux/0.2.0
            trace: collect_build_prerequisites: end fux/0.2.0
            trace: collect_build_postponed (1): cfg-negotiate end {fux^ | libfoo->{fux/1,1}}!
            trace: collect_build_postponed (1): end {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade libfoo/0.1.0
                config.libfoo.extras=true (set by fux)
              reconfigure fux/0.2.0 (dependent of libfoo)
                config.fux.extras=true (dependent configuration)
              reconfigure fex (dependent of fux)
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !fux configured !0.2.0 available 1.0.0
              libfoo configured !0.1.0 available 1.0.0
            !fex configured !0.1.0 available 1.0.0
              !fux configured !0.2.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
            EOO

          cat cfg/fux-0.2.0/build/config.build >>~%EOO%;
            %.*
            config.fux.extras = true
            config.fux.network = false
            %.*
            EOO

          cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.extras = true
            EOO

          $* ?fex ?fux libfoo/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build_prerequisites: skip configured libfoo/0.1.0
            trace: execute_plan: simulate: yes
            trace: evaluate_dependency: fux/0.2.0: update to fux/1.0.0
            trace: evaluate_dependency: fex/0.1.0: unused
            trace: pkg_build: refine package collection/plan execution
            trace: collect_build_prerequisites: pre-reeval fex/0.1.0
            trace: collect_build_prerequisites: pre-reevaluated fex/0.1.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency fux/1.0.0 of existing dependent fex/0.1.0 due to dependency fux/1.0.0
            trace: postponed_configurations::add: create {fex^ | fux->{fex/1,1}}
            trace: collect_drop: fex/0.1.0 package version needs to be replaced with drop
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build_prerequisites: skip configured libfoo/0.1.0
            trace: collect_build_prerequisites: skip expected to be dropped existing dependent fex of dependency fux
            trace: collect_build_prerequisites: begin fux/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/0.1.0 of dependent fux/1.0.0
            trace: collect_build_prerequisites: end fux/1.0.0
            trace: collect_drop: overwrite fex
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: fux/1.0.0: unused
            trace: pkg_build: one of dependency evaluation decisions has changed, re-collecting from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build_prerequisites: skip configured libfoo/0.1.0
            trace: collect_drop: overwrite fex
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: fux/0.2.0: unused
            trace: pkg_build: refine package collection/plan execution
            trace: collect_drop: overwrite fex
            trace: collect_drop: overwrite fux
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              drop fux/0.2.0 (unused)
              drop fex/0.1.0 (unused)
              update libfoo/0.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libfoo configured !0.1.0 available 1.0.0
            EOO

          cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.extras = true
            EOO

          $pkg_drop libfoo
        }

        : require-clause-user-config
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  fex: depends: fux(c)
          #
          #  fux: depends: libfoo(c) ?
          #
          $* fex/0.1.0 fux/0.2.0 +{ config.fux.network=true } 2>!;

          $pkg_status -r >>EOO;
            !fux configured !0.2.0 available 1.0.0
              libfoo configured 1.0.0
            !fex configured !0.1.0 available 1.0.0
              !fux configured !0.2.0 available 1.0.0
                libfoo configured 1.0.0
            EOO

          cat cfg/fux-0.2.0/build/config.build >>~%EOO%;
            %.*
            config.fux.extras = true
            config.fux.network = true
            %.*
            EOO

          cat cfg/libfoo-1.0.0/build2/config.build2 >>~%EOO%;
            %.*
            config.libfoo.extras = true
            config.libfoo.network = false
            %.*
            EOO

          $* ?libfoo/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: execute_plan: simulate: yes
            trace: evaluate_dependency: libfoo/1.0.0: update to libfoo/0.1.0
            trace: pkg_build: refine package collection/plan execution
            trace: collect_build_prerequisites: pre-reeval fux/0.2.0
            trace: collect_build_prerequisites: pre-reevaluated fux/0.2.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of existing dependent fux/0.2.0 due to dependency libfoo/0.1.0
            trace: collect_build: add fux/0.2.0
            trace: postponed_configurations::add: create {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: pre-reeval fux/0.2.0
            trace: collect_build_prerequisites: pre-reevaluated fux/0.2.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: reeval fux/0.2.0
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: postponed_configurations::add: add {fux^ 1,1: libfoo} to {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent fux/0.2.0 results in {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: re-evaluated fux/0.2.0
            trace: collect_build_postponed (1): cfg-negotiate begin {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fux/0.2.0
            trace: collect_build_prerequisites: resume fux/0.2.0
            trace: collect_build_prerequisites: end fux/0.2.0
            trace: collect_build_postponed (1): cfg-negotiate end {fux^ | libfoo->{fux/1,1}}!
            trace: collect_build_postponed (1): end {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade libfoo/0.1.0
                config.libfoo.extras=true (set by fux)
              reconfigure fux/0.2.0 (dependent of libfoo)
                config.fux.network=true (user configuration)
                config.fux.extras=true (dependent configuration)
              reconfigure fex (dependent of fux)
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !fux configured !0.2.0 available 1.0.0
              libfoo configured !0.1.0 available 1.0.0
            !fex configured !0.1.0 available 1.0.0
              !fux configured !0.2.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
            EOO

          cat cfg/fux-0.2.0/build/config.build >>~%EOO%;
            %.*
            config.fux.extras = true
            config.fux.network = true
            %.*
            EOO

          cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.extras = true
            %.*
            EOO

          $* ?fex ?libfoo 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: execute_plan: simulate: yes
            trace: evaluate_dependency: libfoo/0.1.0: update to libfoo/1.0.0
            trace: evaluate_dependency: fex/0.1.0: unused
            trace: pkg_build: refine package collection/plan execution
            trace: collect_build_prerequisites: pre-reeval fux/0.2.0
            trace: collect_build_prerequisites: pre-reevaluated fux/0.2.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent fux/0.2.0 due to dependency libfoo/1.0.0
            trace: collect_build: add fux/0.2.0
            trace: postponed_configurations::add: create {fux^ | libfoo->{fux/1,1}}
            trace: collect_drop: overwrite fex
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: pre-reeval fux/0.2.0
            trace: collect_build_prerequisites: pre-reevaluated fux/0.2.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: reeval fux/0.2.0
            trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
            trace: postponed_configurations::add: add {fux^ 1,1: libfoo} to {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent fux/0.2.0 results in {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_prerequisites: re-evaluated fux/0.2.0
            trace: collect_build_postponed (1): cfg-negotiate begin {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fux/0.2.0
            trace: collect_build_prerequisites: resume fux/0.2.0
            trace: collect_build_prerequisites: end fux/0.2.0
            trace: collect_build_postponed (1): cfg-negotiate end {fux^ | libfoo->{fux/1,1}}!
            trace: collect_build_postponed (1): end {fux^ | libfoo->{fux/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              upgrade libfoo/1.0.0
                config.libfoo.extras=true (set by fux)
              reconfigure fux/0.2.0 (dependent of libfoo)
                config.fux.network=true (user configuration)
                config.fux.extras=true (user configuration)
              drop fex/0.1.0 (unused)
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_drop fux
        }
      }

      : premature
      :
      {
        $clone_cfg;

        $* fux foo fox 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/1.0.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone fox/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo fox | libfoo->{foo/1,1 fox/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {foo fox | libfoo->{foo/1,1 fox/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fox/1.0.0
          trace: collect_build_prerequisites: resume fox/1.0.0
          trace: collect_build_prerequisites: end fox/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo fox | libfoo->{foo/1,1 fox/1,1}}!
          trace: collect_build_postponed (1): end {foo fox | libfoo->{foo/1,1 fox/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !fux configured 1.0.0
            libfoo configured 1.0.0
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !fox configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop fux foo fox
      }

      : bogus-postponement
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  fux: depends: libfoo
        #
        #  foo: depends: libfoo(c)
        #
        #  fix: depends: foo(c)
        #
        $* fux foo fix 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fix/1.0.0
          trace: collect_build_prerequisites: cannot cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (foo), retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: pkg_build: dep-postpone user-specified foo
          trace: collect_build_prerequisites: begin fix/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
          trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
          trace: collect_build_prerequisites: postpone fix/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fix/1.0.0
          trace: collect_build_prerequisites: resume fix/1.0.0
          trace: collect_build_prerequisites: end fix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {fix | foo->{fix/1,1}}!
          trace: collect_build_postponed (2): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (2): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): end {fix | foo->{fix/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            new libfoo/1.0.0 (required by foo, fux)
              config.libfoo.extras=true (set by foo)
            new fux/1.0.0
            new foo/1.0.0
              config.foo.extras=true (set by fix)
              config.foo.libfoo_extras=true (set by foo)
            new fix/1.0.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !fux configured 1.0.0
            libfoo configured 1.0.0
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !fix configured 1.0.0
            !foo configured 1.0.0
              libfoo configured 1.0.0
          EOO

        $pkg_drop fux foo fix
      }
    }

    : existing
    :
    {
      +$clone_cfg

      : dependency
      :
      {
        $clone_cfg;

        $* libfoo --verbose 1 2>!;

        $* foo 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (0): end
          %.*
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            reconfigure/update libfoo/1.0.0 (required by foo)
              config.libfoo.extras=true (set by foo)
            new foo/1.0.0
          %.*
          EOE

        $pkg_status -r >>EOO;
          !libfoo configured 1.0.0
          !foo configured 1.0.0
            !libfoo configured 1.0.0
          EOO

        $pkg_drop foo libfoo
      }

      : dependent-single-pos
      :
      {
        +$clone_cfg

        : basic
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  foo/1.0.0: depends: libfoo(c)
          #
          $* foo +{ config.foo.extras=true } 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add foo/1.0.0
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: postpone foo/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              new libfoo/1.0.0 (required by foo)
                config.libfoo.extras=true (set by foo)
              new foo/1.0.0
                config.foo.extras=true (user configuration)
                config.foo.libfoo_extras=true (set by foo)
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !foo configured 1.0.0
              libfoo configured 1.0.0
            EOO

          cat cfg/foo-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.foo.extras = true
            config.foo.libfoo_extras = true
            %.*
            EOO

          cat cfg/libfoo-1.0.0/build2/config.build2 >>~%EOO%;
            %.*
            config.libfoo.extras = true
            %.*
            EOO

          # Downgrade the dependency.
          #
          $* ?libfoo/0.1.0 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: libfoo/1.0.0: update to libfoo/0.1.0
            %.*
            trace: pkg_build: refine package collection/plan execution
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of existing dependent foo/1.0.0 due to dependency libfoo/0.1.0
            trace: collect_build: add foo/1.0.0
            trace: postponed_configurations::add: create {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo^ | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: reeval foo/1.0.0
            %.*
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluated foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {foo^ | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo^ | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (1): end {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            %.*
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade libfoo/0.1.0
                config.libfoo.extras=true (set by foo)
              reconfigure foo/1.0.0 (dependent of libfoo)
            %.*
            disfigured foo/1.0.0
            %.*
            disfigured libfoo/1.0.0
            %.*
            fetched libfoo/0.1.0
            %.*
            unpacked libfoo/0.1.0
            %.*
            configured libfoo/0.1.0
            %.*
            configured foo/1.0.0
            %.*
            updated foo/1.0.0
            %.*
            EOE

          $pkg_status -r >>EOO;
            !foo configured 1.0.0
              libfoo configured !0.1.0 available 1.0.0
            EOO

          cat cfg/foo-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.foo.extras = true
            config.foo.libfoo_extras = true
            %.*
            EOO

          cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.extras = true
            %.*
            EOO

          # Reconfigure the dependency and hold.
          #
          $* libfoo/0.1.0 +{ config.libfoo.extras=true } 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add libfoo/0.1.0
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of existing dependent foo/1.0.0 due to dependency libfoo/0.1.0
            trace: collect_build: add foo/1.0.0
            trace: postponed_configurations::add: create {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo^ | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: reeval foo/1.0.0
            %.*
            trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluated foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {foo^ | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: skip configured libfoo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo^ | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (1): end {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            %.*
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              reconfigure/update libfoo/0.1.0
                config.libfoo.extras=true (user configuration)
              reconfigure foo/1.0.0 (dependent of libfoo)
            %.*
            disfigured foo/1.0.0
            %.*
            disfigured libfoo/0.1.0
            %.*
            configured libfoo/0.1.0
            %.*
            configured foo/1.0.0
            %.*
            updated libfoo/0.1.0
            %.*
            updated foo/1.0.0
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libfoo configured !0.1.0 available 1.0.0
            !foo configured 1.0.0
              !libfoo configured !0.1.0 available 1.0.0
            EOO

          cat cfg/foo-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.foo.extras = true
            config.foo.libfoo_extras = true
            %.*
            EOO

          cat cfg/libfoo-0.1.0/build/config.build >>~%EOO%;
            %.*
            config.libfoo.extras = true
            %.*
            EOO

          # Upgrade the dependency and unhold existing dependent.
          #
          $* libfoo ?foo 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add libfoo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent foo/1.0.0 due to dependency libfoo/1.0.0
            trace: postponed_configurations::add: create {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo^ | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: reeval foo/1.0.0
            %.*
            trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
            trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluated foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {foo^ | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo^ | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (1): end {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            %.*
            trace: execute_plan: simulate: yes
            %.*
            trace: evaluate_dependency: foo/1.0.0: unused
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add libfoo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            %.*
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent foo/1.0.0 due to dependency libfoo/1.0.0
            trace: postponed_configurations::add: create {foo^ | libfoo->{foo/1,1}}
            trace: collect_drop: foo/1.0.0 package version needs to be replaced with drop
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add libfoo/1.0.0
            %.*
            trace: collect_build_prerequisites: skip expected to be dropped existing dependent foo of dependency libfoo
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_drop: overwrite foo
            %.*
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              upgrade libfoo/1.0.0
                config.libfoo.extras=true (user configuration)
              drop foo/1.0.0 (unused)
            %.*
            disfigured foo/1.0.0
            %.*
            disfigured libfoo/0.1.0
            %.*
            fetched libfoo/1.0.0
            %.*
            unpacked libfoo/1.0.0
            %.*
            purged foo/1.0.0
            %.*
            configured libfoo/1.0.0
            %.*
            updated libfoo/1.0.0
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libfoo configured 1.0.0
            EOO

          cat cfg/libfoo-1.0.0/build2/config.build2 >>~%EOO%;
            %.*
            config.libfoo.extras = true
            %.*
            EOO

          $pkg_drop libfoo
        }

        : multiple-dependents
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  foo/1.0.0: depends: libfoo(c)
          #  fox/1.0.0: depends: libfoo(c)
          #
          $* libfoo/0.1.0 foo/1.0.0 fox/1.0.0 --verbose 1 2>!;

          $pkg_status -r >>EOO;
            !libfoo configured !0.1.0 available 1.0.0
            !foo configured !1.0.0
              !libfoo configured !0.1.0 available 1.0.0
            !fox configured !1.0.0
              !libfoo configured !0.1.0 available 1.0.0
            EOO

          $* libfoo 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: pre-reeval fox/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated fox/1.0.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent foo/1.0.0 due to dependency libfoo/1.0.0
            trace: collect_build: add foo/1.0.0
            trace: postponed_configurations::add: create {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent fox/1.0.0 due to dependency libfoo/1.0.0
            trace: collect_build: add fox/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: pre-reeval fox/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated fox/1.0.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: reeval foo/1.0.0
            trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
            trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluated foo/1.0.0
            trace: collect_build_prerequisites: reeval fox/1.0.0
            trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
            trace: postponed_configurations::add: add {fox^ 1,1: libfoo} to {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent fox/1.0.0 results in {foo^ fox^ | libfoo->{foo/1,1 fox/1,1}}
            trace: collect_build_prerequisites: re-evaluated fox/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {foo^ fox^ | libfoo->{foo/1,1 fox/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fox/1.0.0
            trace: collect_build_prerequisites: resume fox/1.0.0
            trace: collect_build_prerequisites: end fox/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo^ fox^ | libfoo->{foo/1,1 fox/1,1}}!
            trace: collect_build_postponed (1): end {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              upgrade libfoo/1.0.0
                config.libfoo.extras=true (set by foo)
              reconfigure fox/1.0.0 (dependent of libfoo)
                config.fox.libfoo_extras=true (set by fox)
              reconfigure foo/1.0.0 (dependent of libfoo)
                config.foo.libfoo_extras=true (set by foo)
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libfoo configured 1.0.0
            !foo configured !1.0.0
              !libfoo configured 1.0.0
            !fox configured !1.0.0
              !libfoo configured 1.0.0
            EOO

          $pkg_drop libfoo foo fox
        }

        : postpone-existing-dependency
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  bus: depends: foo(c)
          #
          #  fix: depends: foo == 0.1.0
          #
          #  biz/0.1.0: depends: libbiz == 0.1.0
          #
          #  libbiz/1.0.0: depends: libbar
          #  libbiz/0.1.0:
          #
          #  foo: depends: libfoo(c)
          #
          $* bus/0.1.0 --verbose 1 2>!;

          $pkg_status -r >>EOO;
            !bus configured !0.1.0 available 1.0.0
              foo configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $* fix/0.1.0 libbiz biz/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add fix/0.1.0
            trace: collect_build: add libbiz/1.0.0
            trace: collect_build: add biz/0.1.0
            trace: collect_build_prerequisites: begin fix/0.1.0
            trace: collect_build: add foo/0.1.0
            info: package fix dependency on (foo == 0.1.0) is forcing downgrade of foo/1.0.0 to 0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency foo/0.1.0 of dependent fix/0.1.0
            trace: collect_build_prerequisites: pre-reeval bus/0.1.0
            trace: collect_build_prerequisites: pre-reevaluated bus/0.1.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency foo/0.1.0 of existing dependent bus/0.1.0 due to dependency foo/0.1.0
            trace: collect_build: add bus/0.1.0
            trace: postponed_configurations::add: create {bus^ | foo->{bus/1,1}}
            trace: collect_build_prerequisites: end fix/0.1.0
            trace: collect_build_prerequisites: begin libbiz/1.0.0
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbiz/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: end libbiz/1.0.0
            trace: collect_build_prerequisites: begin biz/0.1.0
            trace: collect_build: pick libbiz/0.1.0 over libbiz/1.0.0
            trace: collect_build: libbiz/1.0.0 package version needs to be replaced with libbiz/0.1.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add fix/0.1.0
            trace: collect_build: apply version replacement for libbiz/1.0.0
            trace: collect_build: replacement: libbiz/0.1.0
            trace: collect_build: add libbiz/0.1.0
            trace: collect_build: add biz/0.1.0
            trace: collect_build_prerequisites: begin fix/0.1.0
            trace: collect_build: add foo/0.1.0
            info: package fix dependency on (foo == 0.1.0) is forcing downgrade of foo/1.0.0 to 0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency foo/0.1.0 of dependent fix/0.1.0
            trace: collect_build_prerequisites: pre-reeval bus/0.1.0
            trace: collect_build_prerequisites: pre-reevaluated bus/0.1.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency foo/0.1.0 of existing dependent bus/0.1.0 due to dependency foo/0.1.0
            trace: collect_build: add bus/0.1.0
            trace: postponed_configurations::add: create {bus^ | foo->{bus/1,1}}
            trace: collect_build_prerequisites: end fix/0.1.0
            trace: collect_build_prerequisites: begin libbiz/0.1.0
            trace: collect_build_prerequisites: end libbiz/0.1.0
            trace: collect_build_prerequisites: begin biz/0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbiz/0.1.0 of dependent biz/0.1.0
            trace: collect_build_prerequisites: end biz/0.1.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {bus^ | foo->{bus/1,1}}
            trace: collect_build_prerequisites: pre-reeval bus/0.1.0
            trace: collect_build_prerequisites: pre-reevaluated bus/0.1.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {bus^ | foo->{bus/1,1}}
            trace: collect_build_prerequisites: reeval bus/0.1.0
            trace: collect_build: pick foo/0.1.0 over foo/1.0.0
            trace: postponed_configurations::add: add {bus^ 1,1: foo} to {bus^ | foo->{bus/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent bus/0.1.0 results in {bus^ | foo->{bus/1,1}}
            trace: collect_build_prerequisites: re-evaluated bus/0.1.0
            trace: collect_build_postponed (1): cfg-negotiate begin {bus^ | foo->{bus/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin foo/0.1.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/0.1.0
            trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: postpone foo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bus/0.1.0
            trace: collect_build_prerequisites: resume bus/0.1.0
            trace: collect_build_prerequisites: end bus/0.1.0
            trace: collect_build_postponed (1): cfg-negotiate end {bus^ | foo->{bus/1,1}}!
            trace: collect_build_postponed (2): begin {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (2): skip being built existing dependent foo of dependency libfoo
            trace: collect_build_postponed (2): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: skip configured libfoo/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent foo/0.1.0
            trace: collect_build_prerequisites: resume foo/0.1.0
            trace: collect_build_prerequisites: end foo/0.1.0
            trace: collect_build_postponed (2): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (2): end {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (1): end {bus^ | foo->{bus/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade foo/0.1.0 (required by bus, fix)
                config.foo.extras=true (set by bus)
              reconfigure bus/0.1.0 (dependent of foo)
                config.bus.foo_extras=true (set by bus)
              new fix/0.1.0
              new libbiz/0.1.0
              new biz/0.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !bus configured !0.1.0 available 1.0.0
              foo configured 0.1.0 available 1.0.0 0.2.0
                libfoo configured 1.0.0
            !fix configured !0.1.0 available 1.0.0
              foo configured 0.1.0 available 1.0.0 0.2.0
                libfoo configured 1.0.0
            !libbiz configured 0.1.0 available 1.0.0
            !biz configured !0.1.0 available 1.0.0
              !libbiz configured 0.1.0 available 1.0.0
            EOO

          $pkg_drop bus fix libbiz biz
        }

        : postpone-existing
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  fix/1.0.0: depends: foo(c)
          #  foo/1.0.0: depends: libfoo(c)
          #
          #  fix/0.1.0: depends: foo == 0.1.0
          #  foo/0.1.0: depends: libfoo(c)
          #
          $* fix --verbose 1 2>!;

          $pkg_status -r >>EOO;
            !fix configured 1.0.0
              foo configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $* libfoo/0.1.0 fix/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build: add fix/0.1.0
            trace: collect_build_prerequisites: pre-reeval foo/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of existing dependent foo/1.0.0 due to dependency libfoo/0.1.0
            trace: collect_build: add foo/1.0.0
            trace: postponed_configurations::add: create {foo^ | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: begin fix/0.1.0
            trace: collect_build: pick foo/0.1.0 over foo/1.0.0
            trace: collect_build: foo/1.0.0 package version needs to be replaced with foo/0.1.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build: add fix/0.1.0
            trace: collect_build_prerequisites: skip expected to be built existing dependent foo of dependency libfoo
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_prerequisites: begin fix/0.1.0
            trace: collect_build: apply version replacement for foo/0.1.0
            trace: collect_build: replacement: foo/0.1.0
            trace: collect_build: add foo/0.1.0
            info: package fix dependency on (foo == 0.1.0) is forcing downgrade of foo/1.0.0 to 0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency foo/0.1.0 of dependent fix/0.1.0
            trace: collect_build_prerequisites: skip being built existing dependent fix of dependency foo
            trace: collect_build_prerequisites: begin foo/0.1.0
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/0.1.0 of dependent foo/0.1.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build: add fix/0.1.0
            trace: pkg_build: dep-postpone user-specified libfoo
            trace: collect_build_prerequisites: begin fix/0.1.0
            trace: collect_build: apply version replacement for foo/0.1.0
            trace: collect_build: replacement: foo/0.1.0
            trace: collect_build: add foo/0.1.0
            info: package fix dependency on (foo == 0.1.0) is forcing downgrade of foo/1.0.0 to 0.1.0
            trace: collect_build_prerequisites: no cfg-clause for dependency foo/0.1.0 of dependent fix/0.1.0
            trace: collect_build_prerequisites: skip being built existing dependent fix of dependency foo
            trace: collect_build_prerequisites: begin foo/0.1.0
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of dependent foo/0.1.0
            trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: postpone foo/0.1.0
            trace: collect_build_prerequisites: end fix/0.1.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (1): skip being built existing dependent foo of dependency libfoo
            trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/0.1.0
            trace: collect_build_prerequisites: resume foo/0.1.0
            trace: collect_build_prerequisites: end foo/0.1.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade libfoo/0.1.0
                config.libfoo.extras=true (set by foo)
              downgrade foo/0.1.0 (required by fix)
                config.foo.extras=true (dependent configuration)
              downgrade fix/0.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libfoo configured !0.1.0 available 1.0.0
            !fix configured !0.1.0 available 1.0.0
              foo configured 0.1.0 available 1.0.0 0.2.0
                !libfoo configured !0.1.0 available 1.0.0
            EOO

          $pkg_drop fix libfoo --drop-dependent
        }
      }

      : dependent-mult-pos
      :
      {
        +$clone_cfg

        : non-negotiated
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          $* tex --verbose 1 2>!;

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            EOO

          $* libfoo/0.1.0 libbar/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build: add libbar/0.1.0
            trace: collect_build_prerequisites: pre-reeval tex/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
            trace: collect_build: pick libbar/0.1.0 over libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/0.1.0 of existing dependent tex/1.0.0 due to dependency libfoo/0.1.0
            trace: collect_build: add tex/1.0.0
            trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
            trace: pkg_build: dep-postpone user-specified libbar since already in cluster {tex^ | libbar->{tex/1,1}}
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: pre-reeval tex/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: reeval tex/1.0.0
            trace: collect_build: pick libbar/0.1.0 over libbar/1.0.0
            trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: re-evaluated tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {tex^ | libbar->{tex/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tex^ | libbar->{tex/1,1}}!
            trace: collect_build_postponed (2): begin {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
            trace: collect_build_postponed (2): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (2): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (1): end {tex^ | libbar->{tex/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade libfoo/0.1.0
                config.libfoo.extras=true (set by tex)
              downgrade libbar/0.1.0
                config.libbar.extras=true (set by tex)
              reconfigure tex/1.0.0 (dependent of libbar, libfoo)
                config.tex.libfoo_extras=true (set by tex)
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libbar configured !0.1.0 available 1.0.0
            !libfoo configured !0.1.0 available 1.0.0
            !tex configured 1.0.0
              !libbar configured !0.1.0 available 1.0.0
              !libfoo configured !0.1.0 available 1.0.0
            EOO

          $pkg_drop tex libfoo libbar
        }

        : negotiated
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  bar: depends: libbar == 0.1.0 (c)
          #
          $* tex --verbose 1 2>!;

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            EOO

          $* libfoo/0.1.0 bar/0.1.0 2>&1 | $filter 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build: add bar/0.1.0
            trace: collect_build_prerequisites: pre-reeval tex/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tex/1.0.0 due to dependency libfoo/0.1.0
            trace: collect_build: add tex/1.0.0
            trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: begin bar/0.1.0
            trace: collect_build: pick libbar/0.1.0 over libbar/1.0.0
            trace: collect_build: libbar/1.0.0 package version needs to be replaced with libbar/0.1.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            trace: pkg_build: refine package collection/plan execution from scratch
            trace: collect_build: add libfoo/0.1.0
            trace: collect_build: add bar/0.1.0
            trace: collect_build_prerequisites: pre-reeval tex/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
            trace: collect_build: apply version replacement for libbar/1.0.0
            trace: collect_build: replacement: libbar/0.1.0
            trace: collect_build: add libbar/0.1.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/0.1.0 of existing dependent tex/1.0.0 due to dependency libfoo/0.1.0
            trace: collect_build: add tex/1.0.0
            trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: begin bar/0.1.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/0.1.0 of dependent bar/0.1.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {tex^ | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone bar/0.1.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {bar tex^ | libbar->{bar/1,1 tex/1,1}}
            trace: collect_build_prerequisites: pre-reeval tex/1.0.0
            trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
            trace: collect_build_postponed (1): re-evaluate existing dependents for {bar tex^ | libbar->{bar/1,1 tex/1,1}}
            trace: collect_build_prerequisites: reeval tex/1.0.0
            trace: collect_build: pick libbar/0.1.0 over libbar/1.0.0
            trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {bar tex^ | libbar->{bar/1,1 tex/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {bar tex^ | libbar->{bar/1,1 tex/1,1}}
            trace: collect_build_prerequisites: re-evaluated tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {bar tex^ | libbar->{bar/1,1 tex/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/0.1.0
            trace: collect_build_prerequisites: resume bar/0.1.0
            trace: collect_build_prerequisites: end bar/0.1.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {bar tex^ | libbar->{bar/1,1 tex/1,1}}!
            trace: collect_build_postponed (2): begin {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
            trace: collect_build_postponed (2): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (2): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (1): end {bar tex^ | libbar->{bar/1,1 tex/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              downgrade libfoo/0.1.0
                config.libfoo.extras=true (set by tex)
              downgrade libbar/0.1.0 (required by bar, tex)
                config.libbar.extras=true (set by bar)
              reconfigure tex/1.0.0 (dependent of libbar, libfoo)
                config.tex.libfoo_extras=true (set by tex)
              new bar/0.1.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !libfoo configured !0.1.0 available 1.0.0
            !tex configured 1.0.0
              libbar configured 0.1.0 available 1.0.0
              !libfoo configured !0.1.0 available 1.0.0
            !bar configured !0.1.0 available 1.0.0
              libbar configured 0.1.0 available 1.0.0
            EOO

          $pkg_drop tex libfoo bar
        }

        : up-negotiate
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  baz: depends: {libbar libfoo} == 0.1.0 (c)
          #
          $* tex --verbose 1 2>!;

          $* baz/0.1.0 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add baz/0.1.0
            trace: collect_build_prerequisites: begin baz/0.1.0
            %.*
            trace: collect_build: add libbar/0.1.0
            info: package baz dependency on (libbar == 0.1.0) is forcing downgrade of libbar/1.0.0 to 0.1.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/0.1.0 of dependent baz/0.1.0
            trace: collect_build: add libfoo/0.1.0
            info: package baz dependency on (libfoo == 0.1.0) is forcing downgrade of libfoo/1.0.0 to 0.1.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of dependent baz/0.1.0
            trace: postponed_configurations::add: create {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone baz/0.1.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build_postponed (1): re-evaluate existing dependents for {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build_prerequisites: reeval tex/1.0.0
            %.*
            trace: collect_build: pick libbar/0.1.0 over libbar/1.0.0
            trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {baz tex^ | libbar->{baz/1,1 tex/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: re-evaluated tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate begin {baz tex^ | libbar->{baz/1,1 tex/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/0.1.0
            trace: collect_build_prerequisites: end libbar/0.1.0
            trace: collect_build_prerequisites: begin libfoo/0.1.0
            trace: collect_build_prerequisites: end libfoo/0.1.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/0.1.0
            trace: collect_build_prerequisites: resume baz/0.1.0
            trace: collect_build_prerequisites: end baz/0.1.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build: pick libfoo/0.1.0 over libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/0.1.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: add {tex 2,1: libfoo} to {baz tex^ | libbar->{baz/1,1 tex/1,1} libfoo->{baz/1,1}}?
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libfoo/0.1.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {baz tex^ | libbar->{baz/1,1 tex/1,1} libfoo->{baz/1,1 tex/2,1}}!
            trace: collect_build_postponed (1): end {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_postponed (0): end
            %.*
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 0.1.0 available 1.0.0
              libfoo configured 0.1.0 available 1.0.0
            !baz configured !0.1.0 available 1.0.0
              libbar configured 0.1.0 available 1.0.0
              libfoo configured 0.1.0 available 1.0.0
            EOO

          $pkg_drop tex baz
        }

        : replace-reeval
        :
        {
          +$clone_cfg

          : initial-collection
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  bax: depends: libfoo(c)
            #       depends: {libbox libbar} (c)
            #
            #  baz: depends: {libbar libfoo} (c)
            #
            $* bax baz --verbose 1 2>!;

            $* libbox/0.1.0 2>&1 | $filter 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add libbox/0.1.0
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0 due to dependency libbox/0.1.0
              trace: collect_build: add bax/1.0.0
              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build_prerequisites: pre-reeval baz/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated baz/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build: add baz/1.0.0
              trace: collect_build_prerequisites: reeval baz/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
              trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing retry_configuration
              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, refining configuration
              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build_prerequisites: pre-reeval baz/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated baz/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build: add baz/1.0.0
              trace: collect_build_prerequisites: reeval baz/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
              trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
              trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: begin libbox/0.1.0
              trace: collect_build_prerequisites: end libbox/0.1.0
              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
              trace: collect_build_prerequisites: end bax/1.0.0
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
              trace: collect_build_prerequisites: resume baz/1.0.0
              trace: collect_build_prerequisites: end baz/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}!
              trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (0): end
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                downgrade libbox/0.1.0
                  config.libbox.extras=true (set by bax)
                reconfigure bax/1.0.0 (dependent of libbox, libfoo)
                  config.bax.libfoo_extras=true (set by bax)
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_status -r >>EOO;
              !libbox configured !0.1.0 available 1.0.0
              !bax configured 1.0.0
                libbar configured 1.0.0
                !libbox configured !0.1.0 available 1.0.0
                libfoo configured 1.0.0
              !baz configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              EOO

            $pkg_drop bax baz libbox
          }

          : collect-postponed
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  bax: depends: libfoo(c)
            #       depends: {libbox libbar} (c)
            #
            #  baz: depends: {libbar libfoo} (c)
            #
            #  box: depends: libbox == 0.1.0 (c)
            #
            $* bax baz --verbose 1 2>!;

            $* box/0.1.0 2>&1 | $filter 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add box/0.1.0
              trace: collect_build_prerequisites: begin box/0.1.0
              trace: collect_build: add libbox/0.1.0
              info: package box dependency on (libbox == 0.1.0) is forcing downgrade of libbox/1.0.0 to 0.1.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent box/0.1.0
              trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
              trace: collect_build_prerequisites: postpone box/0.1.0
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
              trace: collect_build: add bax/1.0.0
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin libbox/0.1.0
              trace: collect_build_prerequisites: end libbox/0.1.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.1.0
              trace: collect_build_prerequisites: resume box/0.1.0
              trace: collect_build_prerequisites: end box/0.1.0
              trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
              trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
              trace: collect_build_prerequisites: pre-reeval baz/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated baz/1.0.0: 1,1
              trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
              trace: collect_build: add baz/1.0.0
              trace: collect_build_prerequisites: reeval baz/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
              trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (2): skip being built existing dependent baz of dependency libbar
              trace: collect_build_postponed (2): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
              trace: postponed_configurations::add: merge {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}? into {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!
              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax baz^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1} libfoo->{bax/1,1 baz/1,1}}!, throwing merge_configuration
              trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax baz^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1} libfoo->{bax/1,1 baz/1,1}}!
              trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
              trace: collect_build: add bax/1.0.0
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {box | libbox->{box/1,1}} (shadow cluster-based)
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ box | libbox->{box/1,1} libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libfoo
              trace: collect_build_prerequisites: pre-reeval baz/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated baz/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ box | libbox->{box/1,1} libfoo->{bax/1,1}}
              trace: collect_build: add baz/1.0.0
              trace: collect_build_prerequisites: reeval baz/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ box | libbox->{box/1,1} libfoo->{bax/1,1}} (shadow cluster-based)
              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ box | libbox->{box/1,1} libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ box | libbox->{box/1,1} libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin libbox/0.1.0
              trace: collect_build_prerequisites: end libbox/0.1.0
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ box | libbox->{box/1,1} libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}? (shadow cluster-based)
              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
              trace: collect_build_prerequisites: dependency libbox/0.1.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
              trace: collect_build_prerequisites: end bax/1.0.0
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
              trace: collect_build_prerequisites: resume baz/1.0.0
              trace: collect_build_prerequisites: end baz/1.0.0
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.1.0
              trace: collect_build_prerequisites: resume box/0.1.0
              trace: collect_build_prerequisites: end box/0.1.0
              trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ box | libbox->{bax/2,1 box/1,1} libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1}}!
              trace: collect_build_postponed (1): end {box | libbox->{box/1,1}}
              trace: collect_build_postponed (0): end
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                downgrade libbox/0.1.0 (required by bax, box)
                  config.libbox.extras=true (set by box)
                reconfigure bax/1.0.0 (dependent of libbox)
                  config.bax.libfoo_extras=true (set by bax)
                new box/0.1.0
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_status -r >>EOO;
              !bax configured 1.0.0
                libbar configured 1.0.0
                libbox configured 0.1.0 available 1.0.0
                libfoo configured 1.0.0
              !baz configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !box configured !0.1.0 available 1.0.0 0.2.0
                libbox configured 0.1.0 available 1.0.0
              EOO

            $pkg_drop bax baz box
          }

          : bogus-harmless
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  bax: depends: libfoo(c)
            #       depends: {libbox libbar} (c)
            #
            #  baz: depends: {libbar libfoo} (c)
            #
            $* bax baz --verbose 1 2>!;

            $pkg_status -r >>EOO;
              !bax configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
                libfoo configured 1.0.0
              !baz configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              EOO

            $* libbox/0.1.0 ?baz 2>&1 | $filter 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add libbox/0.1.0
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0 due to dependency libbox/0.1.0
              trace: collect_build: add bax/1.0.0
              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build_prerequisites: pre-reeval baz/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated baz/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build_prerequisites: reeval baz/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
              trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing retry_configuration
              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, refining configuration
              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build_prerequisites: pre-reeval baz/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated baz/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build_prerequisites: reeval baz/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
              trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
              trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build_prerequisites: begin libbox/0.1.0
              trace: collect_build_prerequisites: end libbox/0.1.0
              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
              trace: collect_build_prerequisites: end bax/1.0.0
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
              trace: collect_build_prerequisites: resume baz/1.0.0
              trace: collect_build_prerequisites: end baz/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}!
              trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (0): end
              trace: execute_plan: simulate: yes
              %.*
              trace: evaluate_dependency: baz/1.0.0: unused
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add libbox/0.1.0
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0 due to dependency libbox/0.1.0
              trace: collect_build: add bax/1.0.0
              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
              trace: collect_drop: overwrite baz
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: pre-reeval bax/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
              trace: collect_build_postponed (1): skip being dropped existing dependent baz of dependency libfoo
              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: reeval bax/1.0.0
              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
              trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
              trace: collect_build_prerequisites: postpone bax/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {bax^ | libfoo->{bax/1,1}}!
              trace: collect_build_postponed (2): begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
              trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbox
              trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
              trace: collect_build_postponed (2): skip being dropped existing dependent baz of dependency libbar
              trace: collect_build_postponed (2): cfg-negotiate begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin libbox/0.1.0
              trace: collect_build_prerequisites: end libbox/0.1.0
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
              trace: collect_build_prerequisites: resume bax/1.0.0
              trace: collect_build_prerequisites: end bax/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {bax | libbox->{bax/2,1} libbar->{bax/2,1}}!
              trace: collect_build_postponed (2): end {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
              trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
              trace: collect_build_postponed (0): end
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                drop baz/1.0.0 (unused)
                downgrade libbox/0.1.0
                  config.libbox.extras=true (set by bax)
                reconfigure bax/1.0.0 (dependent of libbox, libfoo)
                  config.bax.libfoo_extras=true (set by bax)
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_status -r >>EOO;
              !libbox configured !0.1.0 available 1.0.0
              !bax configured 1.0.0
                libbar configured 1.0.0
                !libbox configured !0.1.0 available 1.0.0
                libfoo configured 1.0.0
              EOO

            $pkg_drop bax libbox
          }
        }
      }
    }

    : postponed-collection
    :
    {
      +$clone_cfg

      : backtrace
      :
      {
        $clone_cfg;

        $* foo bar box 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add bar/1.0.0
          trace: collect_build: add box/1.0.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin bar/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
          trace: postponed_configurations::add: create {bar | libbar->{bar/1,1}}
          trace: collect_build_prerequisites: postpone bar/1.0.0
          trace: collect_build_prerequisites: begin box/1.0.0
          %.*
          trace: collect_build_prerequisites: alt-postpone dependent box/1.0.0 since max index is reached: 0
            info: dependency alternative: {libbar libfoo}
          {
            require
            {
              config.libbar.extras = true
              config.libfoo.extras = true
            }
          }
          trace: collect_build_prerequisites: postpone box/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (2): begin {bar | libbar->{bar/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {bar | libbar->{bar/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bar/1.0.0
          trace: collect_build_prerequisites: resume bar/1.0.0
          trace: collect_build_prerequisites: end bar/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {bar | libbar->{bar/1,1}}!
          trace: collect_build_postponed (2): index 1 collect alt-postponed box/1.0.0
          trace: collect_build_prerequisites: resume box/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent box/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent box/1.0.0
          %.*
          trace: postponed_configurations::add: add {box 1,1: libbar libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: postponed_configurations::add: merge {bar | libbar->{bar/1,1}}! into {box foo | libfoo->{box/1,1 foo/1,1} libbar->{box/1,1}}!
          %.*
          trace: collect_build_prerequisites: cfg-postponing dependent box/1.0.0 involves (being) negotiated configurations and results in {bar box foo | libfoo->{box/1,1 foo/1,1} libbar->{bar/1,1 box/1,1}}!, throwing retry_configuration
          trace: collect_build_postponed (0): cfg-negotiation of {foo | libfoo->{foo/1,1}} failed due to dependent box, refining configuration
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (2): begin {bar | libbar->{bar/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {bar | libbar->{bar/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bar/1.0.0
          trace: collect_build_prerequisites: resume bar/1.0.0
          trace: collect_build_prerequisites: end bar/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {bar | libbar->{bar/1,1}}!
          trace: collect_build_postponed (2): index 1 collect alt-postponed box/1.0.0
          trace: collect_build_prerequisites: resume box/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent box/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent box/1.0.0
          %.*
          trace: postponed_configurations::add: add {box 1,1: libbar libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: postponed_configurations::add: merge {bar | libbar->{bar/1,1}}! into {box foo | libfoo->{box/1,1 foo/1,1} libbar->{box/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent box/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent box/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent box/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end box/1.0.0
          trace: collect_build_postponed (2): end {bar | libbar->{bar/1,1}}
          trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !bar configured 1.0.0
            libbar configured 1.0.0
          !box configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop foo bar box
      }

      : premature
      :
      {
        $clone_cfg;

        $* fux fix 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin fix/1.0.0
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
          trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
          trace: collect_build_prerequisites: postpone fix/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin fix/1.0.0
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
          trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
          trace: collect_build_prerequisites: postpone fix/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fix/1.0.0
          trace: collect_build_prerequisites: resume fix/1.0.0
          trace: collect_build_prerequisites: end fix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {fix | foo->{fix/1,1}}!
          trace: collect_build_postponed (2): begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (2): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): end {fix | foo->{fix/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !fux configured 1.0.0
            libfoo configured 1.0.0
          !fix configured 1.0.0
            foo configured 1.0.0
              libfoo configured 1.0.0
          EOO

        $pkg_drop fux fix
      }

      : double-premature
      :
      {
        $clone_cfg;

        $* fux bex fix buz 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add bex/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build: add buz/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin bex/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent bex/1.0.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: end bex/1.0.0
          trace: collect_build_prerequisites: begin fix/1.0.0
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
          trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
          trace: collect_build_prerequisites: postpone fix/1.0.0
          trace: collect_build_prerequisites: begin buz/1.0.0
          %.*
          trace: collect_build: add bux/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bux/1.0.0 of dependent buz/1.0.0
          trace: postponed_configurations::add: create {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: postpone buz/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add bex/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build: add buz/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin bex/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent bex/1.0.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: end bex/1.0.0
          trace: collect_build_prerequisites: begin fix/1.0.0
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
          trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
          trace: collect_build_prerequisites: postpone fix/1.0.0
          trace: collect_build_prerequisites: begin buz/1.0.0
          %.*
          trace: collect_build: add bux/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bux/1.0.0 of dependent buz/1.0.0
          trace: postponed_configurations::add: create {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: postpone buz/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fix/1.0.0
          trace: collect_build_prerequisites: resume fix/1.0.0
          trace: collect_build_prerequisites: end fix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {fix | foo->{fix/1,1}}!
          trace: collect_build_postponed (2): begin {buz | bux->{buz/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {buz | bux->{buz/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin bux/1.0.0
          %.*
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libbar/1.0.0 of dependent bux/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libbar), retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fux/1.0.0
          trace: collect_build: add bex/1.0.0
          trace: collect_build: add fix/1.0.0
          trace: collect_build: add buz/1.0.0
          trace: collect_build_prerequisites: begin fux/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
          trace: collect_build_prerequisites: end fux/1.0.0
          trace: collect_build_prerequisites: begin bex/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libbar/1.0.0 of dependent bex/1.0.0
          trace: collect_build_prerequisites: end bex/1.0.0
          trace: collect_build_prerequisites: begin fix/1.0.0
          %.*
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
          trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
          trace: collect_build_prerequisites: postpone fix/1.0.0
          trace: collect_build_prerequisites: begin buz/1.0.0
          %.*
          trace: collect_build: add bux/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bux/1.0.0 of dependent buz/1.0.0
          trace: postponed_configurations::add: create {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: postpone buz/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fix/1.0.0
          trace: collect_build_prerequisites: resume fix/1.0.0
          trace: collect_build_prerequisites: end fix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {fix | foo->{fix/1,1}}!
          trace: collect_build_postponed (2): begin {buz | bux->{buz/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {buz | bux->{buz/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin bux/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bux/1.0.0
          trace: postponed_configurations::add: create {bux | libbar->{bux/1,1}}
          trace: collect_build_prerequisites: postpone bux/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent buz/1.0.0
          trace: collect_build_prerequisites: resume buz/1.0.0
          trace: collect_build_prerequisites: end buz/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {buz | bux->{buz/1,1}}!
          trace: collect_build_postponed (3): begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (3): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          %.*
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (3): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (4): begin {bux | libbar->{bux/1,1}}
          %.*
          trace: collect_build_postponed (4): cfg-negotiate begin {bux | libbar->{bux/1,1}}
          %.*
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent bux/1.0.0
          trace: collect_build_prerequisites: resume bux/1.0.0
          trace: collect_build_prerequisites: end bux/1.0.0
          trace: collect_build_postponed (4): cfg-negotiate end {bux | libbar->{bux/1,1}}!
          trace: collect_build_postponed (4): end {bux | libbar->{bux/1,1}}
          trace: collect_build_postponed (3): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (2): end {buz | bux->{buz/1,1}}
          trace: collect_build_postponed (1): end {fix | foo->{fix/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !fux configured 1.0.0
            libfoo configured 1.0.0
          !fix configured 1.0.0
            foo configured 1.0.0
              libfoo configured 1.0.0
          !bex configured 1.0.0
            libbar configured 1.0.0
          !buz configured 1.0.0
            bux configured 1.0.0
              libbar configured 1.0.0
          EOO

        $pkg_drop fux bex fix buz
      }

      : premature-in-cluster
      :
      : Test recollecting from scratch if the prematurely collected dependency
      : belongs (as a dependency) to a non-negotiated cluster.
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  bas: depends: libbar(c)
        #       depends: bus(c)
        #
        #  bax: depends: libfoo(c)
        #       depends: {libbox libbar} (c)
        #
        #  bix: depends: {libbar bar} (c)
        #       depends: bux
        #
        #  buz: depends: bux(c)
        #
        #  buc: depends: libfoo(c)
        #       depends: bux(c)
        #
        #  bus: depends: libbaz(c)
        #       depends: foo(c)
        #
        #  bux: depends: libbar(c)
        #
        #  bar: depends: libbar(c)
        #
        #  foo: depends: libfoo(c)
        #
        $* bas bax bix buz buc 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add bas/1.0.0
          trace: collect_build: add bax/1.0.0
          trace: collect_build: add bix/1.0.0
          trace: collect_build: add buz/1.0.0
          trace: collect_build: add buc/1.0.0
          trace: collect_build_prerequisites: begin bas/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bas/1.0.0
          trace: postponed_configurations::add: create {bas | libbar->{bas/1,1}}
          trace: collect_build_prerequisites: postpone bas/1.0.0
          trace: collect_build_prerequisites: begin bax/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: create {bax | libfoo->{bax/1,1}}
          trace: collect_build_prerequisites: postpone bax/1.0.0
          trace: collect_build_prerequisites: begin bix/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bix/1.0.0
          trace: collect_build: add bar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent bix/1.0.0
          trace: postponed_configurations::add: add {bix 1,1: libbar bar} to {bas | libbar->{bas/1,1}}
          trace: collect_build_prerequisites: postpone bix/1.0.0
          trace: collect_build_prerequisites: begin buz/1.0.0
          trace: collect_build: add bux/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bux/1.0.0 of dependent buz/1.0.0
          trace: postponed_configurations::add: create {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: postpone buz/1.0.0
          trace: collect_build_prerequisites: begin buc/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent buc/1.0.0
          trace: postponed_configurations::add: add {buc 1,1: libfoo} to {bax | libfoo->{bax/1,1}}
          trace: collect_build_prerequisites: postpone buc/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: begin bar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
          trace: postponed_configurations::add: add {bar 1,1: libbar} to {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}?
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
          trace: collect_build_prerequisites: resume bas/1.0.0
          trace: collect_build: add bus/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
          trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
          trace: collect_build_prerequisites: postpone bas/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bix/1.0.0
          trace: collect_build_prerequisites: resume bix/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency bux/1.0.0 of dependent bix/1.0.0 since already in cluster {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: end bix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {bar bas bix | libbar->{bar/1,1 bas/1,1 bix/1,1} bar->{bix/1,1}}!
          trace: collect_build_postponed (2): begin {bax buc | libfoo->{bax/1,1 buc/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {bax buc | libfoo->{bax/1,1 buc/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bar bas bix | libbar->{bar/1,1 bas/1,1 bix/1,1} bar->{bix/1,1}}!
          trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bar bas bax bix | libbar->{bar/1,1 bas/1,1 bax/2,1 bix/1,1} bar->{bix/1,1} libbox->{bax/2,1}}!, throwing retry_configuration
          trace: collect_build_postponed (0): cfg-negotiation of {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}} failed due to dependent bax, refining configuration
          trace: collect_build_postponed (1): begin {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: begin bar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
          trace: postponed_configurations::add: add {bar 1,1: libbar} to {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}?
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
          trace: collect_build_prerequisites: resume bas/1.0.0
          trace: collect_build: add bus/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
          trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
          trace: collect_build_prerequisites: postpone bas/1.0.0
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bix/1.0.0
          trace: collect_build_prerequisites: resume bix/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency bux/1.0.0 of dependent bix/1.0.0 since already in cluster {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: end bix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {bar bas bix | libbar->{bar/1,1 bas/1,1 bix/1,1} bar->{bix/1,1}}!
          trace: collect_build_postponed (2): begin {bax buc | libfoo->{bax/1,1 buc/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {bax buc | libfoo->{bax/1,1 buc/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bar bas bix | libbar->{bar/1,1 bas/1,1 bix/1,1} bar->{bix/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
          trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bax/1.0.0
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent buc/1.0.0
          trace: collect_build_prerequisites: resume buc/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bux/1.0.0 of dependent buc/1.0.0
          trace: postponed_configurations::add: add {buc 2,1: bux} to {buz | bux->{buz/1,1}}
          trace: collect_build_prerequisites: postpone buc/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {bax buc | libfoo->{bax/1,1 buc/1,1}}!
          trace: collect_build_postponed (3): begin {buc buz | bux->{buc/2,1 buz/1,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {buc buz | bux->{buc/2,1 buz/1,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin bux/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bux/1.0.0
          trace: postponed_configurations::add: add {bux 1,1: libbar} to {bar bas bax bix | libbar->{bar/1,1 bas/1,1 bax/2,1 bix/1,1} bar->{bix/1,1} libbox->{bax/2,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bux/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bux/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bux/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent buc/1.0.0
          trace: collect_build_prerequisites: resume buc/1.0.0
          trace: collect_build_prerequisites: end buc/1.0.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent buz/1.0.0
          trace: collect_build_prerequisites: resume buz/1.0.0
          trace: collect_build_prerequisites: end buz/1.0.0
          trace: collect_build_postponed (3): cfg-negotiate end {buc buz | bux->{buc/2,1 buz/1,1}}!
          trace: collect_build_postponed (4): begin {bas | bus->{bas/2,1}}
          trace: collect_build_postponed (4): cfg-negotiate begin {bas | bus->{bas/2,1}}
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin bus/1.0.0
          trace: collect_build: add libbaz/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
          trace: postponed_configurations::add: create {bus | libbaz->{bus/1,1}}
          trace: collect_build_prerequisites: postpone bus/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent bas/1.0.0
          trace: collect_build_prerequisites: resume bas/1.0.0
          trace: collect_build_prerequisites: end bas/1.0.0
          trace: collect_build_postponed (4): cfg-negotiate end {bas | bus->{bas/2,1}}!
          trace: collect_build_postponed (5): begin {bus | libbaz->{bus/1,1}}
          trace: collect_build_postponed (5): cfg-negotiate begin {bus | libbaz->{bus/1,1}}
          trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbaz/1.0.0
          trace: collect_build_prerequisites: end libbaz/1.0.0
          trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent bus/1.0.0
          trace: collect_build_prerequisites: resume bus/1.0.0
          trace: collect_build: add foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0
          trace: postponed_configurations::add: create {bus | foo->{bus/2,1}}
          trace: collect_build_prerequisites: postpone bus/1.0.0
          trace: collect_build_postponed (5): cfg-negotiate end {bus | libbaz->{bus/1,1}}!
          trace: collect_build_postponed (6): begin {bus | foo->{bus/2,1}}
          trace: collect_build_postponed (6): cfg-negotiate begin {bus | foo->{bus/2,1}}
          trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: add {foo 1,1: libfoo} to {bax buc | libfoo->{bax/1,1 buc/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent foo/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent foo/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent bus/1.0.0
          trace: collect_build_prerequisites: resume bus/1.0.0
          trace: collect_build_prerequisites: end bus/1.0.0
          trace: collect_build_postponed (6): cfg-negotiate end {bus | foo->{bus/2,1}}!
          trace: collect_build_postponed (6): end {bus | foo->{bus/2,1}}
          trace: collect_build_postponed (5): end {bus | libbaz->{bus/1,1}}
          trace: collect_build_postponed (4): end {bas | bus->{bas/2,1}}
          trace: collect_build_postponed (3): end {buc buz | bux->{buc/2,1 buz/1,1}}
          trace: collect_build_postponed (2): end {bax buc | libfoo->{bax/1,1 buc/1,1}}
          trace: collect_build_postponed (1): end {bas bix | libbar->{bas/1,1 bix/1,1} bar->{bix/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            new libbaz/1.0.0 (required by bus)
              config.libbaz.extras=true (set by bus)
            new libbox/1.0.0 (required by bax)
              config.libbox.extras=true (set by bax)
            new libfoo/1.0.0 (required by bax, buc, foo)
              config.libfoo.extras=true (set by bax)
            new foo/1.0.0 (required by bus)
              config.foo.extras=true (set by bus)
              config.foo.libfoo_extras=true (set by foo)
            new bus/1.0.0 (required by bas)
              config.bus.extras=true (set by bas)
            new libbar/1.0.0 (required by bar, bas, bax, bix, bux)
              config.libbar.extras=true (set by bas)
            new bas/1.0.0
            new bax/1.0.0
              config.bax.libfoo_extras=true (set by bax)
            new bar/1.0.0 (required by bix)
              config.bar.extras=true (set by bix)
            new bux/1.0.0 (required by bix, buc, buz)
              config.bux.extras=true (set by buc)
            new bix/1.0.0
            new buz/1.0.0
            new buc/1.0.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !bas configured 1.0.0
            bus configured 1.0.0
              foo configured 1.0.0
                libfoo configured 1.0.0
              libbaz configured 1.0.0
            libbar configured 1.0.0
          !bax configured 1.0.0
            libbar configured 1.0.0
            libbox configured 1.0.0
            libfoo configured 1.0.0
          !bix configured 1.0.0
            bar configured 1.0.0
              libbar configured 1.0.0
            bux configured 1.0.0
              libbar configured 1.0.0
            libbar configured 1.0.0
          !buz configured 1.0.0
            bux configured 1.0.0
              libbar configured 1.0.0
          !buc configured 1.0.0
            bux configured 1.0.0
              libbar configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop bas bax bix buz buc
      }

      : up-negotiate-dependency
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  bar: depends: libbar(c)
        #
        #  bux: depends: libbar(c)
        #
        #  bix: depends: {libbar bar} (c)
        #       depends: bux
        #
        $* bix 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add bix/1.0.0
          trace: collect_build_prerequisites: begin bix/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bix/1.0.0
          trace: collect_build: add bar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent bix/1.0.0
          trace: postponed_configurations::add: create {bix | libbar->{bix/1,1} bar->{bix/1,1}}
          trace: collect_build_prerequisites: postpone bix/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {bix | libbar->{bix/1,1} bar->{bix/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {bix | libbar->{bix/1,1} bar->{bix/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: begin bar/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
          trace: postponed_configurations::add: add {bar 1,1: libbar} to {bix | libbar->{bix/1,1} bar->{bix/1,1}}?
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bix/1.0.0
          trace: collect_build_prerequisites: resume bix/1.0.0
          %.*
          trace: collect_build: add bux/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency bux/1.0.0 of dependent bix/1.0.0
          trace: collect_build_prerequisites: begin bux/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bux/1.0.0
          trace: postponed_configurations::add: add {bux 1,1: libbar} to {bar bix | libbar->{bar/1,1 bix/1,1} bar->{bix/1,1}}?
          %.*
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bux/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bux/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bux/1.0.0
          trace: collect_build_prerequisites: end bix/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {bar bix bux | libbar->{bar/1,1 bix/1,1 bux/1,1} bar->{bix/1,1}}!
          trace: collect_build_postponed (1): end {bix | libbar->{bix/1,1} bar->{bix/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !bix configured 1.0.0
            bar configured 1.0.0
              libbar configured 1.0.0
            bux configured 1.0.0
              libbar configured 1.0.0
            libbar configured 1.0.0
          EOO

        $pkg_drop bix
      }

      : postponed-alts
      :
      {
        +$clone_cfg

        : with-premature
        :
        {
          $clone_cfg;

          $* fux boo 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add fux/1.0.0
            trace: collect_build: add boo/1.0.0
            trace: collect_build_prerequisites: begin fux/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent fux/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end fux/1.0.0
            trace: collect_build_prerequisites: begin boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 0
              info: dependency alternative: libbar
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (0): index 1 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 1
              info: dependency alternative: libfoo
            {
              require
              {
                config.libfoo.extras = true
              }
            }
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (0): index 2 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent boo/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add fux/1.0.0
            trace: collect_build: add boo/1.0.0
            trace: collect_build_prerequisites: begin fux/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
            trace: collect_build_prerequisites: end fux/1.0.0
            trace: collect_build_prerequisites: begin boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 0
              info: dependency alternative: libbar
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (0): index 1 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 1
              info: dependency alternative: libfoo
            {
              require
              {
                config.libfoo.extras = true
              }
            }
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (0): index 2 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent boo/1.0.0
            %.*
            trace: postponed_configurations::add: create {boo | libfoo->{boo/1,2}}
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (1): begin {boo | libfoo->{boo/1,2}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {boo | libfoo->{boo/1,2}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            trace: collect_build_prerequisites: end boo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {boo | libfoo->{boo/1,2}}!
            trace: collect_build_postponed (1): end {boo | libfoo->{boo/1,2}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !fux configured 1.0.0
              libfoo configured 1.0.0
            !boo configured 1.0.0
              libfoo configured 1.0.0
            EOO

          $pkg_drop fux boo
        }

        : with-premature-complex
        :
        {
          $clone_cfg;

          $* fux bex fix biz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add fux/1.0.0
            trace: collect_build: add bex/1.0.0
            trace: collect_build: add fix/1.0.0
            trace: collect_build: add biz/1.0.0
            trace: collect_build_prerequisites: begin fux/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent fux/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end fux/1.0.0
            trace: collect_build_prerequisites: begin bex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent bex/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: end bex/1.0.0
            trace: collect_build_prerequisites: begin fix/1.0.0
            %.*
            trace: collect_build: add foo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
            trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
            trace: collect_build_prerequisites: postpone fix/1.0.0
            trace: collect_build_prerequisites: begin biz/1.0.0
            %.*
            trace: collect_build: add boo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency boo/1.0.0 of dependent biz/1.0.0
            trace: postponed_configurations::add: create {biz | boo->{biz/1,1}}
            trace: collect_build_prerequisites: postpone biz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add fux/1.0.0
            trace: collect_build: add bex/1.0.0
            trace: collect_build: add fix/1.0.0
            trace: collect_build: add biz/1.0.0
            trace: collect_build_prerequisites: begin fux/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent fux/1.0.0
            trace: collect_build_prerequisites: end fux/1.0.0
            trace: collect_build_prerequisites: begin bex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent bex/1.0.0
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: end bex/1.0.0
            trace: collect_build_prerequisites: begin fix/1.0.0
            %.*
            trace: collect_build: add foo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent fix/1.0.0
            trace: postponed_configurations::add: create {fix | foo->{fix/1,1}}
            trace: collect_build_prerequisites: postpone fix/1.0.0
            trace: collect_build_prerequisites: begin biz/1.0.0
            %.*
            trace: collect_build: add boo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency boo/1.0.0 of dependent biz/1.0.0
            trace: postponed_configurations::add: create {biz | boo->{biz/1,1}}
            trace: collect_build_prerequisites: postpone biz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {fix | foo->{fix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {fix | foo->{fix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: postpone foo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent fix/1.0.0
            trace: collect_build_prerequisites: resume fix/1.0.0
            trace: collect_build_prerequisites: end fix/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {fix | foo->{fix/1,1}}!
            trace: collect_build_postponed (2): begin {biz | boo->{biz/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {biz | boo->{biz/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 0
              info: dependency alternative: libbar
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent biz/1.0.0
            trace: collect_build_prerequisites: resume biz/1.0.0
            trace: collect_build_prerequisites: end biz/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {biz | boo->{biz/1,1}}!
            trace: collect_build_postponed (3): begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (3): index 1 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent boo/1.0.0
            trace: collect_build_prerequisites: end boo/1.0.0
            trace: collect_build_postponed (3): end {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (2): end {biz | boo->{biz/1,1}}
            trace: collect_build_postponed (1): end {fix | foo->{fix/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !fux configured 1.0.0
              libfoo configured 1.0.0
            !fix configured 1.0.0
              foo configured 1.0.0
                libfoo configured 1.0.0
            !bex configured 1.0.0
              libbar configured 1.0.0
            !biz configured 1.0.0
              boo configured 1.0.0
                libbar configured 1.0.0
            EOO

          $pkg_drop fux bex fix biz
        }

        : up-negotiate
        :
        {
          $clone_cfg;

          $* foo boo 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add foo/1.0.0
            trace: collect_build: add boo/1.0.0
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: postpone foo/1.0.0
            trace: collect_build_prerequisites: begin boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 0
              info: dependency alternative: libbar
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (1): index 1 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 1
              info: dependency alternative: libfoo
            {
              require
              {
                config.libfoo.extras = true
              }
            }
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (1): index 2 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent boo/1.0.0
            %.*
            trace: postponed_configurations::add: add {boo 1,2: libfoo} to {foo | libfoo->{foo/1,1}}!
            %.*
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent boo/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent boo/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end boo/1.0.0
            trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !foo configured 1.0.0
              libfoo configured 1.0.0
            !boo configured 1.0.0
              libfoo configured 1.0.0
            EOO

          $pkg_drop foo boo
        }

        : after-negotiation
        :
        {
          $clone_cfg;

          $* foo biz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add foo/1.0.0
            trace: collect_build: add biz/1.0.0
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
            trace: collect_build_prerequisites: postpone foo/1.0.0
            trace: collect_build_prerequisites: begin biz/1.0.0
            %.*
            trace: collect_build: add boo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency boo/1.0.0 of dependent biz/1.0.0
            %.*
            trace: postponed_configurations::add: create {biz | boo->{biz/1,1}}
            trace: collect_build_prerequisites: postpone biz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
            trace: collect_build_postponed (2): begin {biz | boo->{biz/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {biz | boo->{biz/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 0
              info: dependency alternative: libbar
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent biz/1.0.0
            trace: collect_build_prerequisites: resume biz/1.0.0
            trace: collect_build_prerequisites: end biz/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {biz | boo->{biz/1,1}}!
            trace: collect_build_postponed (2): index 1 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: alt-postpone dependent boo/1.0.0 since max index is reached: 1
              info: dependency alternative: libfoo
            {
              require
              {
                config.libfoo.extras = true
              }
            }
            trace: collect_build_prerequisites: postpone boo/1.0.0
            trace: collect_build_postponed (2): index 2 collect alt-postponed boo/1.0.0
            trace: collect_build_prerequisites: resume boo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent boo/1.0.0
            %.*
            trace: postponed_configurations::add: add {boo 1,2: libfoo} to {foo | libfoo->{foo/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent boo/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent boo/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end boo/1.0.0
            trace: collect_build_postponed (2): end {biz | boo->{biz/1,1}}
            trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !foo configured 1.0.0
              libfoo configured 1.0.0
            !biz configured 1.0.0
              boo configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $pkg_drop foo biz
        }
      }

      : bogus-postponement
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  tax: depends: libbar(c)
        #       depends: libfoo
        #
        #  toz/0.1.0:
        #
        #  toz/1.0.0: depends: libbaz(c)
        #             depends: libfoo(c)
        #             depends: libbar(c)
        #
        #  tez: depends: libbox(c)
        #       depends: toz == 0.1.0 (c)
        #       depends: libbar(c)
        #
        $* tax toz tez 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add tax/1.0.0
          trace: collect_build: add toz/1.0.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tax/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
          trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: postpone tax/1.0.0
          trace: collect_build_prerequisites: begin toz/1.0.0
          %.*
          trace: collect_build: add libbaz/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent toz/1.0.0
          trace: postponed_configurations::add: create {toz | libbaz->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/1.0.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          %.*
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
          trace: collect_build_prerequisites: resume tax/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent tax/1.0.0
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end tax/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
          trace: collect_build_postponed (2): begin {toz | libbaz->{toz/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {toz | libbaz->{toz/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbaz/1.0.0
          trace: collect_build_prerequisites: end libbaz/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/1.0.0
          trace: collect_build_prerequisites: resume toz/1.0.0
          %.*
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent toz/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add tax/1.0.0
          trace: collect_build: add toz/1.0.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tax/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
          trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: postpone tax/1.0.0
          trace: collect_build_prerequisites: begin toz/1.0.0
          %.*
          trace: collect_build: add libbaz/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent toz/1.0.0
          trace: postponed_configurations::add: create {toz | libbaz->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/1.0.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          %.*
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
          trace: collect_build_prerequisites: resume tax/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
          trace: collect_build_prerequisites: end tax/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
          trace: collect_build_postponed (2): begin {toz | libbaz->{toz/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {toz | libbaz->{toz/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbaz/1.0.0
          trace: collect_build_prerequisites: end libbaz/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/1.0.0
          trace: collect_build_prerequisites: resume toz/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/1.0.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/2,1}}
          trace: collect_build_prerequisites: postpone toz/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {toz | libbaz->{toz/1,1}}!
          trace: collect_build_postponed (3): begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (3): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          %.*
          trace: collect_build: pick toz/0.1.0 over toz/1.0.0
          trace: collect_build: toz/1.0.0 package version needs to be replaced with toz/0.1.0
          trace: pkg_build: collection failed due to package version replacement, retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add tax/1.0.0
          trace: collect_build: apply version replacement for toz/1.0.0
          trace: collect_build: replacement: toz/0.1.0
          trace: collect_build: add toz/0.1.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tax/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
          trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: postpone tax/1.0.0
          trace: collect_build_prerequisites: begin toz/0.1.0
          trace: collect_build_prerequisites: end toz/0.1.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          %.*
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
          trace: collect_build_prerequisites: resume tax/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
          trace: collect_build_prerequisites: end tax/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          %.*
          trace: collect_build_prerequisites: cannot cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (toz), retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add tax/1.0.0
          trace: collect_build: apply version replacement for toz/1.0.0
          trace: collect_build: replacement: toz/0.1.0
          trace: collect_build: add toz/0.1.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tax/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
          trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: postpone tax/1.0.0
          trace: pkg_build: dep-postpone user-specified toz
          trace: collect_build_prerequisites: begin tez/1.0.0
          %.*
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
          trace: collect_build_prerequisites: resume tax/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
          trace: collect_build_prerequisites: end tax/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {tez | toz->{tez/2,1}}
          %.*
          trace: collect_build_postponed (3): cfg-negotiate begin {tez | toz->{tez/2,1}}
          %.*
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.1.0
          trace: collect_build_prerequisites: end toz/0.1.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tax | libbar->{tax/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (3): cfg-negotiate end {tez | toz->{tez/2,1}}!
          %.*
          trace: collect_build_postponed (3): erase bogus postponement libfoo
          trace: collect_build_postponed (3): bogus postponements erased, throwing
          trace: pkg_build: collection failed due to bogus dependency collection postponement cancellation, retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add tax/1.0.0
          trace: collect_build: apply version replacement for toz/1.0.0
          trace: collect_build: replacement: toz/0.1.0
          trace: collect_build: add toz/0.1.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tax/1.0.0
          %.*
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
          trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: postpone tax/1.0.0
          trace: pkg_build: dep-postpone user-specified toz
          trace: collect_build_prerequisites: begin tez/1.0.0
          %.*
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
          %.*
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
          trace: collect_build_prerequisites: resume tax/1.0.0
          %.*
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent tax/1.0.0
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: end tax/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          %.*
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {tez | toz->{tez/2,1}}
          %.*
          trace: collect_build_postponed (3): cfg-negotiate begin {tez | toz->{tez/2,1}}
          %.*
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.1.0
          trace: collect_build_prerequisites: end toz/0.1.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          %.*
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tax | libbar->{tax/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (3): cfg-negotiate end {tez | toz->{tez/2,1}}!
          trace: collect_build_postponed (3): end {tez | toz->{tez/2,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tax | libbar->{tax/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          EOE

        $pkg_status -r >>EOO;
          !toz configured 0.1.0 available 1.0.0 0.2.0
          !tax configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
          !tez configured 1.0.0
            libbar configured 1.0.0
            libbox configured 1.0.0
            !toz configured 0.1.0 available 1.0.0 0.2.0
          EOO

        $pkg_drop tax toz tez
      }

      : unconstrain-deps
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  tvz: depends: toz == 0.2.0 (c)
        #
        #  toz/0.2.0: depends: libfoo(c)
        #             depends: libbar(c)
        #
        #  tez: depends: libbox(c)
        #       depends: toz == 0.1.0 (c)
        #       depends: libbar(c)
        #
        $* tvz 2>!;

        $pkg_status -r >>EOO;
          !tvz configured 1.0.0
            toz configured 0.2.0 available 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
          EOO

        $* tvz +{ config.tvz.extras=true } tez 2>&1 != 0 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/1.0.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tvz/1.0.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/1.0.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
          trace: collect_build_prerequisites: resume tvz/1.0.0
          trace: collect_build_prerequisites: end tvz/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (3): cfg-negotiate end {toz | libfoo->{toz/1,1}}!
          trace: collect_build_postponed (4): begin {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (4): skip being built existing dependent toz of dependency libbar
          trace: collect_build_postponed (4): cfg-negotiate begin {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (4): cfg-negotiate end {tez toz | libbar->{tez/3,1 toz/2,1}}!
          trace: collect_build_postponed (4): end {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (3): end {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replace unsatisfied dependent version tez/1.0.0 with 0.1.0 by adding constraint 'tez' -> 'tez == 0.1.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/1.0.0
          trace: collect_build: add tez/0.1.0
          trace: collect_build_prerequisites: begin tvz/1.0.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/1.0.0
          trace: collect_build_prerequisites: begin tez/0.1.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
          trace: collect_build_prerequisites: resume tvz/1.0.0
          trace: collect_build_prerequisites: end tvz/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/0.1.0
          trace: collect_build_prerequisites: resume tez/0.1.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/0.1.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/0.1.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/0.1.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libbar->{toz/2,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (3): cfg-negotiate end {toz | libfoo->{toz/1,1}}!
          trace: collect_build_postponed (4): begin {toz | libbar->{toz/2,1}}
          trace: collect_build_postponed (4): skip being built existing dependent toz of dependency libbar
          trace: collect_build_postponed (4): cfg-negotiate begin {toz | libbar->{toz/2,1}}
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (4): cfg-negotiate end {toz | libbar->{toz/2,1}}!
          trace: collect_build_postponed (4): end {toz | libbar->{toz/2,1}}
          trace: collect_build_postponed (3): end {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of unsatisfied dependent version tez/0.1.0 is denied since it is specified on command line as 'tez == 0.1.0'
          trace: try_replace_dependent: try to replace conflicting dependent tvz/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replace conflicting dependent version tvz/1.0.0 with 0.1.0 by adding constraint 'tvz' -> 'tvz == 0.1.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/0.1.0
          trace: collect_build: add tez/0.1.0
          trace: collect_build_prerequisites: begin tvz/0.1.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_prerequisites: begin tez/0.1.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build: add bax/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
          trace: collect_build_prerequisites: begin bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {bax toz | libfoo->{bax/1,1 toz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/0.1.0
          trace: collect_build_prerequisites: resume tez/0.1.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/0.1.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/0.1.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/0.1.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: collect_build_prerequisites: skip being built existing dependent toz of dependency libbar
          trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!, throwing retry_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to dependent bax, refining configuration
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/0.1.0
          trace: collect_build_prerequisites: resume tez/0.1.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/0.1.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/0.1.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/0.1.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: collect_build_prerequisites: skip being built existing dependent toz of dependency libbar
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_prerequisites: end bax/1.0.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/0.2.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/0.2.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build_prerequisites: end tvz/0.1.0
          trace: collect_build_postponed (3): cfg-negotiate end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
          trace: collect_build_postponed (3): end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of unsatisfied dependent version tez/0.1.0 is denied since it is specified on command line as 'tez == 0.1.0'
          trace: try_replace_dependent: try to replace conflicting dependent tvz/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of conflicting dependent version tvz/0.1.0 is denied since it is specified on command line as 'tvz == 0.1.0'
          trace: pkg_build: cannot replace any package, rolling back latest command line adjustment ('tvz' -> 'tvz == 0.1.0')
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/1.0.0
          trace: collect_build: add tez/0.1.0
          trace: collect_build_prerequisites: begin tvz/1.0.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/1.0.0
          trace: collect_build_prerequisites: begin tez/0.1.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
          trace: collect_build_prerequisites: resume tvz/1.0.0
          trace: collect_build_prerequisites: end tvz/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/0.1.0
          trace: collect_build_prerequisites: resume tez/0.1.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/0.1.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/0.1.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/0.1.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libbar->{toz/2,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (3): cfg-negotiate end {toz | libfoo->{toz/1,1}}!
          trace: collect_build_postponed (4): begin {toz | libbar->{toz/2,1}}
          trace: collect_build_postponed (4): skip being built existing dependent toz of dependency libbar
          trace: collect_build_postponed (4): cfg-negotiate begin {toz | libbar->{toz/2,1}}
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (4): cfg-negotiate end {toz | libbar->{toz/2,1}}!
          trace: collect_build_postponed (4): end {toz | libbar->{toz/2,1}}
          trace: collect_build_postponed (3): end {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of unsatisfied dependent version tez/0.1.0 is denied since it is specified on command line as 'tez == 0.1.0'
          trace: try_replace_dependent: try to replace conflicting dependent tvz/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement tvz/0.1.0 tried earlier for same command line, skipping
          trace: pkg_build: cannot replace any package, rolling back latest command line adjustment ('tez' -> 'tez == 0.1.0')
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/1.0.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tvz/1.0.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/1.0.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
          trace: collect_build_prerequisites: resume tvz/1.0.0
          trace: collect_build_prerequisites: end tvz/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (3): cfg-negotiate end {toz | libfoo->{toz/1,1}}!
          trace: collect_build_postponed (4): begin {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (4): skip being built existing dependent toz of dependency libbar
          trace: collect_build_postponed (4): cfg-negotiate begin {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (4): cfg-negotiate end {tez toz | libbar->{tez/3,1 toz/2,1}}!
          trace: collect_build_postponed (4): end {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (3): end {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement tez/0.1.0 tried earlier for same command line, skipping
          trace: try_replace_dependent: try to replace conflicting dependent tvz/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replace conflicting dependent version tvz/1.0.0 with 0.1.0 by adding constraint 'tvz' -> 'tvz == 0.1.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/0.1.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tvz/0.1.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build: add bax/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
          trace: collect_build_prerequisites: begin bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {bax toz | libfoo->{bax/1,1 toz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: postponed_configurations::add: merge {tez | libbar->{tez/3,1}} into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
          trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!, throwing merge_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tez | libbox->{tez/1,1}}? (shadow cluster-based)
          trace: collect_build_prerequisites: skip being built existing dependent toz of dependency libbar
          trace: collect_build_prerequisites: cfg-postponing dependent tez/1.0.0 involves (being) negotiated configurations and results in {tez | libbox->{tez/1,1} libbar->{tez/3,1}}?, throwing retry_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to dependent tez, refining configuration
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tez | libbox->{tez/1,1}}? (shadow cluster-based)
          trace: collect_build_prerequisites: skip being built existing dependent toz of dependency libbar
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is shadow-negotiated
          trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1} libbar->{tez/3,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1} libbar->{tez/3,1}}! (shadow cluster-based)
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
          trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bax/1.0.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/0.2.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/0.2.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build_prerequisites: end tvz/0.1.0
          trace: collect_build_postponed (3): cfg-negotiate end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
          trace: collect_build_postponed (3): end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement tez/0.1.0 tried earlier for same command line, skipping
          trace: try_replace_dependent: try to replace conflicting dependent tvz/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of conflicting dependent version tvz/0.1.0 is denied since it is specified on command line as 'tvz == 0.1.0'
          trace: pkg_build: cannot replace any package, rolling back latest command line adjustment ('tvz' -> 'tvz == 0.1.0')
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/1.0.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tvz/1.0.0
          trace: collect_build: add toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/1.0.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tvz of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
          trace: collect_build_prerequisites: resume tvz/1.0.0
          trace: collect_build_prerequisites: end tvz/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libbox/1.0.0
          trace: collect_build_prerequisites: end libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libfoo
          trace: collect_build_postponed (3): cfg-negotiate begin {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (3): cfg-negotiate end {toz | libfoo->{toz/1,1}}!
          trace: collect_build_postponed (4): begin {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (4): skip being built existing dependent toz of dependency libbar
          trace: collect_build_postponed (4): cfg-negotiate begin {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (4): cfg-negotiate end {tez toz | libbar->{tez/3,1 toz/2,1}}!
          trace: collect_build_postponed (4): end {tez toz | libbar->{tez/3,1 toz/2,1}}
          trace: collect_build_postponed (3): end {toz | libfoo->{toz/1,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement tez/0.1.0 tried earlier for same command line, skipping
          trace: try_replace_dependent: try to replace conflicting dependent tvz/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement tvz/0.1.0 tried earlier for same command line, skipping
          error: unable to satisfy constraints on package toz
            info: tvz/1.0.0 depends on (toz == 0.2.0)
            info: tez/1.0.0 depends on (toz == 0.1.0)
            info: available toz/0.2.0
            info: available toz/0.1.0
            info: while satisfying tez/1.0.0
            info: explicitly specify toz version to manually satisfy both constraints
          %.*
          EOE

        $pkg_drop tvz
      }

      : restore-unsatisfied-depts
      :
      {
        $clone_cfg;

        #  Dependencies:
        #
        #  tez: depends: libbox(c)
        #       depends: toz == 0.1.0 (c)
        #       depends: libbar(c)
        #
        #  toz/0.1.0:
        #
        #  toz/0.2.0: depends: libfoo(c)
        #             depends: libbar(c)
        #
        #  tvz: depends: toz == 0.2.0 (c)
        #       depends: bax
        #       depends: libfoo(c)
        #
        #  bax: depends: libfoo(c)
        #       depends: {libbox libbar} (c)
        #
        $* tez 2>!;

        $pkg_status -r >>EOO;
          !tez configured 1.0.0
            libbar configured 1.0.0
            libbox configured 1.0.0
            toz configured 0.1.0 available 1.0.0 0.2.0
          EOO

        $* tvz/0.1.0 tez +{ config.tvz.extras=true } 2>&1 != 0 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/0.1.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tvz/0.1.0
          trace: collect_build: add toz/0.2.0
          info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tez of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build: add bax/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
          trace: collect_build_prerequisites: begin bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {bax toz | libfoo->{bax/1,1 toz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: postponed_configurations::add: merge {tez | libbar->{tez/3,1}} into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
          trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!, throwing merge_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tez | libbox->{tez/1,1}}? (shadow cluster-based)
          trace: collect_build_prerequisites: skip being built existing dependent tez of dependency libbar
          trace: collect_build_prerequisites: cfg-postponing dependent tez/1.0.0 involves (being) negotiated configurations and results in {tez | libbox->{tez/1,1} libbar->{tez/3,1}}?, throwing retry_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to dependent tez, refining configuration
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tez | libbox->{tez/1,1}}? (shadow cluster-based)
          trace: collect_build_prerequisites: skip being built existing dependent tez of dependency libbar
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is shadow-negotiated
          trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1} libbar->{tez/3,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1} libbar->{tez/3,1}}! (shadow cluster-based)
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
          trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bax/1.0.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/0.2.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/0.2.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build_prerequisites: end tvz/0.1.0
          trace: collect_build_postponed (3): cfg-negotiate end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
          trace: collect_build_postponed (3): end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replace unsatisfied dependent version tez/1.0.0 with 0.1.0 by adding constraint 'tez' -> 'tez == 0.1.0' on command line
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/0.1.0
          trace: collect_build: add tez/0.1.0
          trace: collect_build_prerequisites: begin tvz/0.1.0
          trace: collect_build: add toz/0.2.0
          info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_prerequisites: begin tez/0.1.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tez of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build: add bax/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
          trace: collect_build_prerequisites: begin bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {bax toz | libfoo->{bax/1,1 toz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/0.1.0
          trace: collect_build_prerequisites: resume tez/0.1.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/0.1.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/0.1.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/0.1.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: collect_build_prerequisites: skip being built existing dependent tez of dependency libbar
          trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!, throwing retry_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to dependent bax, refining configuration
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/0.1.0
          trace: collect_build_prerequisites: resume tez/0.1.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/0.1.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/0.1.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/0.1.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end tez/0.1.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: collect_build_prerequisites: skip being built existing dependent tez of dependency libbar
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_prerequisites: end bax/1.0.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/0.2.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/0.2.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build_prerequisites: end tvz/0.1.0
          trace: collect_build_postponed (3): cfg-negotiate end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
          trace: collect_build_postponed (3): end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of unsatisfied dependent version tez/0.1.0 is denied since it is specified on command line as 'tez == 0.1.0'
          trace: try_replace_dependent: try to replace conflicting dependent tvz/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of conflicting dependent version tvz/0.1.0 is denied since it is specified on command line as 'tvz == 0.1.0'
          trace: pkg_build: cannot replace any package, rolling back latest command line adjustment ('tez' -> 'tez == 0.1.0')
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add tvz/0.1.0
          trace: collect_build: add tez/1.0.0
          trace: collect_build_prerequisites: begin tvz/0.1.0
          trace: collect_build: add toz/0.2.0
          info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_prerequisites: begin tez/1.0.0
          trace: collect_build: add libbox/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): skip being built existing dependent tez of dependency toz
          trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin toz/0.2.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone toz/0.2.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build: add bax/1.0.0
          trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
          trace: collect_build_prerequisites: begin bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
          trace: collect_build_prerequisites: postpone bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
          trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {bax toz | libfoo->{bax/1,1 toz/1,1}}
          trace: collect_build_prerequisites: postpone tvz/0.1.0
          trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
          trace: collect_build_prerequisites: postpone tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
          trace: postponed_configurations::add: merge {tez | libbar->{tez/3,1}} into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
          trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!, throwing merge_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tez | libbox->{tez/1,1}}? (shadow cluster-based)
          trace: collect_build_prerequisites: skip being built existing dependent tez of dependency libbar
          trace: collect_build_prerequisites: cfg-postponing dependent tez/1.0.0 involves (being) negotiated configurations and results in {tez | libbox->{tez/1,1} libbar->{tez/3,1}}?, throwing retry_configuration
          trace: collect_build_postponed (1): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to dependent tez, refining configuration
          trace: collect_build_postponed (2): begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tez of dependency libbox
          trace: collect_build_postponed (2): cfg-negotiate begin {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbox/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
          trace: collect_build_prerequisites: resume tez/1.0.0
          trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
          trace: collect_build: pick toz/0.2.0 over toz/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
          trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: postponed_configurations::add: add {tez 3,1: libbar} to {tez | libbox->{tez/1,1}}? (shadow cluster-based)
          trace: collect_build_prerequisites: skip being built existing dependent tez of dependency libbar
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is shadow-negotiated
          trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent tez/1.0.0
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_prerequisites: end tez/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tez | libbox->{tez/1,1} libbar->{tez/3,1}}!
          trace: collect_build_postponed (3): begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): cfg-negotiate begin {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
          trace: collect_build_prerequisites: resume bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
          trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1} libbar->{tez/3,1}}! (shadow cluster-based)
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
          trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end bax/1.0.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
          trace: collect_build_prerequisites: resume toz/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
          trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/0.2.0 is negotiated
          trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/0.2.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end toz/0.2.0
          trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
          trace: collect_build_prerequisites: resume tvz/0.1.0
          trace: collect_build_prerequisites: end tvz/0.1.0
          trace: collect_build_postponed (3): cfg-negotiate end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
          trace: collect_build_postponed (3): end {bax toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
          trace: collect_build_postponed (2): end {tez | libbox->{tez/1,1}}
          trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: execute_plan: while configuring dependent tez in simulation mode unconstrain (toz == 0.1.0)
          %.*
          trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
          trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement tez/0.1.0 tried earlier for same command line, skipping
          trace: try_replace_dependent: try to replace conflicting dependent tvz/0.1.0 of dependency toz/0.2.0 with some other version
          trace: try_replace_dependency: replacement of conflicting dependent version tvz/0.1.0 is denied since it is specified on command line as 'tvz == 0.1.0'
          error: unable to satisfy constraints on package toz
            info: tvz/0.1.0 depends on (toz == 0.2.0)
                    command line requires (tvz == 0.1.0)
            info: tez/1.0.0 depends on (toz == 0.1.0)
            info: available toz/0.2.0
            info: available toz/0.1.0
            info: while satisfying tez/1.0.0
            info: explicitly specify toz version to manually satisfy both constraints
          %.*
          EOE

        $pkg_drop tez
      }
    }

    : cycle
    :
    {
      +$clone_cfg

      : direct
      :
      {
        +$clone_cfg

        : args-tex-tix
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  tix: depends: libbar(c)
          #       depends: tex(c)
          #
          $* tex tix 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add tix/1.0.0
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_prerequisites: begin tix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: add {tix 1,1: libbar} to {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tex tix | libbar->{tex/1,1 tix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tex tix | libbar->{tex/1,1 tix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add tix/1.0.0
            trace: pkg_build: dep-postpone user-specified tex
            trace: collect_build_prerequisites: begin tix/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
            trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix | libbar->{tix/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            trace: collect_build_prerequisites: end tix/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
            trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
            trace: collect_build_postponed (1): end {tix | libbar->{tix/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !tix configured 1.0.0
              libbar configured 1.0.0
              !tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $pkg_drop tex tix
        }

        : args-tix
        :
        : As above but with the different command-line arguments which results
        : in the different cluster list at the moment of the cycle detection.
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  tix: depends: libbar(c)
          #       depends: tex(c)
          #
          $* tix 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tix/1.0.0
            trace: collect_build_prerequisites: begin tix/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
            trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix | libbar->{tix/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            trace: collect_build_prerequisites: end tix/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
            trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
            trace: collect_build_postponed (1): end {tix | libbar->{tix/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tix configured 1.0.0
              libbar configured 1.0.0
              tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $pkg_drop tix
        }

        : args-tex-tix-tux
        :
        : Here tux requires tix/0.1.0 which has no dependencies.
        :
        {
          $clone_cfg;

          $* tex tix tux 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add tix/1.0.0
            trace: collect_build: add tux/1.0.0
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_prerequisites: begin tix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: add {tix 1,1: libbar} to {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_prerequisites: begin tux/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tux/1.0.0
            trace: postponed_configurations::add: create {tux | libbox->{tux/1,1}}
            trace: collect_build_prerequisites: postpone tux/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tex tix | libbar->{tex/1,1 tix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tex tix | libbar->{tex/1,1 tix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add tix/1.0.0
            trace: collect_build: add tux/1.0.0
            trace: pkg_build: dep-postpone user-specified tex
            trace: collect_build_prerequisites: begin tix/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_prerequisites: begin tux/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tux/1.0.0
            trace: postponed_configurations::add: create {tux | libbox->{tux/1,1}}
            trace: collect_build_prerequisites: postpone tux/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
            trace: collect_build_prerequisites: resume tix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
            trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
            trace: collect_build_prerequisites: postpone tix/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
            trace: collect_build_postponed (2): begin {tux | libbox->{tux/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tux | libbox->{tux/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tux/1.0.0
            trace: collect_build_prerequisites: resume tux/1.0.0
            %.*
            trace: collect_build: pick tix/0.1.0 over tix/1.0.0
            trace: collect_build: tix/1.0.0 package version needs to be replaced with tix/0.1.0
            trace: pkg_build: collection failed due to package version replacement, retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: apply version replacement for tix/1.0.0
            trace: collect_build: replacement: tix/0.1.0
            trace: collect_build: add tix/0.1.0
            trace: collect_build: add tux/1.0.0
            trace: pkg_build: dep-postpone user-specified tex
            trace: collect_build_prerequisites: begin tix/0.1.0
            trace: collect_build_prerequisites: end tix/0.1.0
            trace: collect_build_prerequisites: begin tux/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tux/1.0.0
            trace: postponed_configurations::add: create {tux | libbox->{tux/1,1}}
            trace: collect_build_prerequisites: postpone tux/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tux | libbox->{tux/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tux | libbox->{tux/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tux/1.0.0
            trace: collect_build_prerequisites: resume tux/1.0.0
            %.*
            trace: collect_build_prerequisites: no cfg-clause for dependency tix/0.1.0 of dependent tux/1.0.0
            trace: collect_build_prerequisites: end tux/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tux | libbox->{tux/1,1}}!
            %.*
            trace: collect_build_postponed (1): erase bogus postponement tex
            trace: collect_build_postponed (1): bogus postponements erased, throwing
            trace: pkg_build: collection failed due to bogus dependency collection postponement cancellation, retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: apply version replacement for tix/1.0.0
            trace: collect_build: replacement: tix/0.1.0
            trace: collect_build: add tix/0.1.0
            trace: collect_build: add tux/1.0.0
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_prerequisites: begin tix/0.1.0
            trace: collect_build_prerequisites: end tix/0.1.0
            trace: collect_build_prerequisites: begin tux/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tux/1.0.0
            trace: postponed_configurations::add: create {tux | libbox->{tux/1,1}}
            trace: collect_build_prerequisites: postpone tux/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tex | libbar->{tex/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tex | libbar->{tex/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tex | libbar->{tex/1,1}}!
            trace: collect_build_postponed (2): begin {tux | libbox->{tux/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tux | libbox->{tux/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tux/1.0.0
            trace: collect_build_prerequisites: resume tux/1.0.0
            %.*
            trace: collect_build_prerequisites: no cfg-clause for dependency tix/0.1.0 of dependent tux/1.0.0
            trace: collect_build_prerequisites: end tux/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tux | libbox->{tux/1,1}}!
            trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): end {tux | libbox->{tux/1,1}}
            trace: collect_build_postponed (1): end {tex | libbar->{tex/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !tix configured 0.1.0 available 1.0.0
            !tux configured 1.0.0
              libbox configured 1.0.0
              !tix configured 0.1.0 available 1.0.0
            EOO

          $pkg_drop tex tix tux
        }

        : args-tex-tiz
        :
        : Note that tiz is a correct version of tix, which fixes the
        : configuration cycle.
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  tiz: depends: tex(c)
          #       depends: libbar(c)
          #
          $* tex tiz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add tiz/1.0.0
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_prerequisites: begin tiz/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add tiz/1.0.0
            trace: pkg_build: dep-postpone user-specified tex
            trace: collect_build_prerequisites: begin tiz/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0
            trace: postponed_configurations::add: create {tiz | tex->{tiz/1,1}}
            trace: collect_build_prerequisites: postpone tiz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tiz | tex->{tiz/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tiz | tex->{tiz/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
            trace: collect_build_prerequisites: resume tiz/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
            trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tiz/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tiz | tex->{tiz/1,1}}!
            trace: collect_build_postponed (2): begin {tex tiz | libbar->{tex/1,1 tiz/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tex tiz | libbar->{tex/1,1 tiz/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
            trace: collect_build_prerequisites: resume tiz/1.0.0
            trace: collect_build_prerequisites: end tiz/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tex tiz | libbar->{tex/1,1 tiz/2,1}}!
            trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): end {tex tiz | libbar->{tex/1,1 tiz/2,1}}
            trace: collect_build_postponed (1): end {tiz | tex->{tiz/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !tiz configured 1.0.0
              libbar configured 1.0.0
              !tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $pkg_drop tex tiz
        }

        : args-tiz
        :
        : Note that tiz is a correct version of tix, which fixes the
        : configuration cycle.
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  tiz: depends: tex(c)
          #       depends: libbar(c)
          #
          $* tiz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tiz/1.0.0
            trace: collect_build_prerequisites: begin tiz/1.0.0
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0
            trace: postponed_configurations::add: create {tiz | tex->{tiz/1,1}}
            trace: collect_build_prerequisites: postpone tiz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tiz | tex->{tiz/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tiz | tex->{tiz/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
            trace: collect_build_prerequisites: resume tiz/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
            trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tiz/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tiz | tex->{tiz/1,1}}!
            trace: collect_build_postponed (2): begin {tex tiz | libbar->{tex/1,1 tiz/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tex tiz | libbar->{tex/1,1 tiz/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
            trace: collect_build_prerequisites: resume tiz/1.0.0
            trace: collect_build_prerequisites: end tiz/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {tex tiz | libbar->{tex/1,1 tiz/2,1}}!
            trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
            trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
            trace: collect_build_postponed (2): end {tex tiz | libbar->{tex/1,1 tiz/2,1}}
            trace: collect_build_postponed (1): end {tiz | tex->{tiz/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tiz configured 1.0.0
              libbar configured 1.0.0
              tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
            EOO

          $pkg_drop tiz
        }

        : depends-depends-conflict
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tex: depends: libbar(c)
          #       depends: libfoo(c)
          #
          #  toz: depends: libfoo(c)
          #       depends: libbar(c)
          #
          $* tex toz/0.2.0 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tex/1.0.0
            trace: collect_build: add toz/0.2.0
            trace: collect_build_prerequisites: begin tex/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_prerequisites: begin toz/0.2.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
            trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
            trace: collect_build_prerequisites: postpone toz/0.2.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tex | libbar->{tex/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tex | libbar->{tex/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
            trace: postponed_configurations::add: add {tex 2,1: libfoo} to {toz | libfoo->{toz/1,1}}
            trace: collect_build_prerequisites: postpone tex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tex | libbar->{tex/1,1}}!
            trace: collect_build_postponed (2): begin {tex toz | libfoo->{tex/2,1 toz/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {tex toz | libfoo->{tex/2,1 toz/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tex/1.0.0
            trace: collect_build_prerequisites: resume tex/1.0.0
            trace: collect_build_prerequisites: end tex/1.0.0
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
            trace: collect_build_prerequisites: resume toz/0.2.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
            trace: postponed_configurations::add: add {toz 2,1: libbar} to {tex | libbar->{tex/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/0.2.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/0.2.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end toz/0.2.0
            trace: collect_build_postponed (2): cfg-negotiate end {tex toz | libfoo->{tex/2,1 toz/1,1}}!
            trace: collect_build_postponed (2): end {tex toz | libfoo->{tex/2,1 toz/1,1}}
            trace: collect_build_postponed (1): end {tex | libbar->{tex/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tex configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !toz configured !0.2.0 available 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            EOO

          $pkg_drop tex toz
        }

        : package-depends-conflict
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  baz: depends: {libbar libfoo} (c)
          #
          #  bac: depends: libbar(c)
          #       depends: libbaz(c)
          #       depends: libfoo(c)
          #
          #  bat: depends: libbaz(c)
          #
          $* baz bac bat 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add baz/1.0.0
            trace: collect_build: add bac/1.0.0
            trace: collect_build: add bat/1.0.0
            trace: collect_build_prerequisites: begin baz/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent baz/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent baz/1.0.0
            trace: postponed_configurations::add: create {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone baz/1.0.0
            trace: collect_build_prerequisites: begin bac/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bac/1.0.0
            trace: postponed_configurations::add: add {bac 1,1: libbar} to {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone bac/1.0.0
            trace: collect_build_prerequisites: begin bat/1.0.0
            %.*
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
            trace: postponed_configurations::add: create {bat | libbaz->{bat/1,1}}
            trace: collect_build_prerequisites: postpone bat/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {bac baz | libbar->{bac/1,1 baz/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {bac baz | libbar->{bac/1,1 baz/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bac/1.0.0
            trace: collect_build_prerequisites: resume bac/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bac/1.0.0
            trace: postponed_configurations::add: add {bac 2,1: libbaz} to {bat | libbaz->{bat/1,1}}
            trace: collect_build_prerequisites: postpone bac/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
            trace: collect_build_prerequisites: resume baz/1.0.0
            trace: collect_build_prerequisites: end baz/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {bac baz | libbar->{bac/1,1 baz/1,1} libfoo->{baz/1,1}}!
            trace: collect_build_postponed (2): begin {bac bat | libbaz->{bac/2,1 bat/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {bac bat | libbaz->{bac/2,1 bat/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bac/1.0.0
            trace: collect_build_prerequisites: resume bac/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bac/1.0.0
            trace: postponed_configurations::add: add {bac 3,1: libfoo} to {bac baz | libbar->{bac/1,1 baz/1,1} libfoo->{baz/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bac/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent bac/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bac/1.0.0
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bat/1.0.0
            trace: collect_build_prerequisites: resume bat/1.0.0
            trace: collect_build_prerequisites: end bat/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {bac bat | libbaz->{bac/2,1 bat/1,1}}!
            trace: collect_build_postponed (2): end {bac bat | libbaz->{bac/2,1 bat/1,1}}
            trace: collect_build_postponed (1): end {bac baz | libbar->{bac/1,1 baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !baz configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !bac configured 1.0.0
              libbar configured 1.0.0
              libbaz configured 1.0.0
              libfoo configured 1.0.0
            !bat configured 1.0.0
              libbaz configured 1.0.0
            EOO

          $pkg_drop baz bac bat
        }

        : existing
        :
        {
          +$clone_cfg

          : dependency-new-downgrade
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  tex: depends: libbar(c)
            #       depends: libfoo(c)
            #
            #  tix: depends: libbar(c)
            #       depends: tex(c)
            #
            $* tex --verbose 1 2>!;

            # Build new dependency of an existing dependent.
            #
            $* tix 2>&1 | $filter 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add tix/1.0.0
              trace: collect_build_prerequisites: begin tix/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: pre-reeval tex/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
              trace: collect_build: add tex/1.0.0
              trace: collect_build_prerequisites: reeval tex/1.0.0
              trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tix | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ tix | libbar->{tex/1,1 tix/1,1}}
              trace: collect_build_prerequisites: re-evaluated tex/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {tex^ tix | libbar->{tex/1,1 tix/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
              trace: collect_build_prerequisites: resume tex/1.0.0
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
              trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
              trace: collect_build_prerequisites: postpone tex/1.0.0
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0 (collected prematurely), throwing postpone_dependency
              trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add tix/1.0.0
              trace: collect_build_prerequisites: begin tix/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: pre-reeval tex/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
              trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
              trace: collect_build: add tex/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
              trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin tex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
              trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix | libbar->{tix/1,1}}!
              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
              trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
              trace: collect_build_prerequisites: postpone tex/1.0.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: end tix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
              trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
              trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
              trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
              trace: collect_build_prerequisites: resume tex/1.0.0
              trace: collect_build_prerequisites: end tex/1.0.0
              trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
              trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
              trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (1): end {tix | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): end
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                new tix/1.0.0
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_status -r >>EOO;
              !tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !tix configured 1.0.0
                libbar configured 1.0.0
                !tex configured 1.0.0
                  libbar configured 1.0.0
                  libfoo configured 1.0.0
              EOO

            # Downgrade the existing dependency of an existing dependent.
            #
            $* tex/0.3.0 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              %.*
              trace: collect_build: add tex/0.3.0
              %.*
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tix/1.0.0 due to dependency tex/0.3.0
              trace: collect_build: add tix/1.0.0
              trace: postponed_configurations::add: create {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): skip being built existing dependent tex of dependency libbar
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: reeval tix/1.0.0
              %.*
              trace: postponed_configurations::add: add {tix^ 1,1: libbar} to {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent tix/1.0.0 results in {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluated tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              %.*
              trace: collect_build: pick tex/0.3.0 over tex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency tex/0.3.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {tix^ | libbar->{tix/1,1}}!
              trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): skip being built existing dependent tix of dependency tex
              trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin tex/0.3.0
              %.*
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/0.3.0
              trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix^ | libbar->{tix/1,1}}!
              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/0.3.0 is negotiated
              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/0.3.0 is already (being) recursively collected, skipping
              %.*
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/0.3.0
              trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
              trace: collect_build_prerequisites: postpone tex/0.3.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: end tix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
              trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
              %.*
              trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
              trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
              %.*
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/0.3.0
              trace: collect_build_prerequisites: resume tex/0.3.0
              trace: collect_build_prerequisites: end tex/0.3.0
              trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
              trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
              trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (1): end {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): end
              %.*
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                downgrade tex/0.3.0
                  config.tex.extras=true (set by tix)
                reconfigure tix/1.0.0 (dependent of libbar, tex)
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_drop tex tix
          }

          : dependency-downgrade
          :
          : Note that here we also specify the existing dependent tix on the
          : command line to make sure that its noop recursive collection
          : doesn't prevent it from being properly re-evaluated afterwords.
          :
          : Also note that tex/0.1.0 doesn't depend on libbar.
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  tex: depends: libbar(c)
            #       depends: libfoo(c)
            #
            #  tix: depends: libbar(c)
            #       depends: tex(c)
            #
            $* tex tix --verbose 1 2>!;

            $* tix tex/0.1.0 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              %.*
              trace: collect_build: add tix/1.0.0
              trace: collect_build: add tex/0.1.0
              trace: collect_build_prerequisites: skip configured tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tix/1.0.0 due to dependency tex/0.1.0
              trace: postponed_configurations::add: create {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): skip being built existing dependent tex of dependency libbar
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: reeval tix/1.0.0
              %.*
              trace: postponed_configurations::add: add {tix^ 1,1: libbar} to {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent tix/1.0.0 results in {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluated tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              %.*
              trace: collect_build: pick tex/0.1.0 over tex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency tex/0.1.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {tix^ | libbar->{tix/1,1}}!
              trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): skip being built existing dependent tix of dependency tex
              trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin tex/0.1.0
              %.*
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/0.1.0
              trace: postponed_configurations::add: create {tex | libfoo->{tex/1,1}}
              trace: collect_build_prerequisites: postpone tex/0.1.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: end tix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
              trace: collect_build_postponed (3): begin {tex | libfoo->{tex/1,1}}
              %.*
              trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
              trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/1,1}}
              %.*
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/0.1.0
              trace: collect_build_prerequisites: resume tex/0.1.0
              trace: collect_build_prerequisites: end tex/0.1.0
              trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/1,1}}!
              trace: collect_build_postponed (3): end {tex | libfoo->{tex/1,1}}
              trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (1): end {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): end
              %.*
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                downgrade tex/0.1.0
                  config.tex.extras=true (set by tix)
                reconfigure/update tix/1.0.0
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_drop tex tix
          }

          : dependency-downgrade-unhold
          :
          : As above but the dependency is also unheld.
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  tex: depends: libbar(c)
            #       depends: libfoo(c)
            #
            #  tix: depends: libbar(c)
            #       depends: tex(c)
            #
            $* tex tix --verbose 1 2>!;

            $* tix ?tex/0.1.0 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              %.*
              trace: collect_build: add tix/1.0.0
              trace: collect_build_prerequisites: skip configured tix/1.0.0
              trace: execute_plan: simulate: yes
              %.*
              trace: evaluate_dependency: tex/1.0.0: update to tex/0.1.0
              %.*
              trace: pkg_build: refine package collection/plan execution
              %.*
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tix/1.0.0 due to dependency tex/0.1.0
              trace: postponed_configurations::add: create {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): skip being built existing dependent tex of dependency libbar
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: reeval tix/1.0.0
              %.*
              trace: postponed_configurations::add: add {tix^ 1,1: libbar} to {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent tix/1.0.0 results in {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluated tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              %.*
              trace: collect_build: pick tex/0.1.0 over tex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency tex/0.1.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {tix^ | libbar->{tix/1,1}}!
              trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): skip being built existing dependent tix of dependency tex
              trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin tex/0.1.0
              %.*
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/0.1.0
              trace: postponed_configurations::add: create {tex | libfoo->{tex/1,1}}
              trace: collect_build_prerequisites: postpone tex/0.1.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: end tix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
              trace: collect_build_postponed (3): begin {tex | libfoo->{tex/1,1}}
              %.*
              trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
              trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/1,1}}
              %.*
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/0.1.0
              trace: collect_build_prerequisites: resume tex/0.1.0
              trace: collect_build_prerequisites: end tex/0.1.0
              trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/1,1}}!
              trace: collect_build_postponed (3): end {tex | libfoo->{tex/1,1}}
              trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (1): end {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): end
              %.*
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                downgrade/unhold tex/0.1.0
                  config.tex.extras=true (set by tix)
                reconfigure/update tix/1.0.0
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_drop tix
          }

          : dependency-downgrade-unhold-premature
          :
          : As above but the dependency (tex/0.2.0) depends on libbar without
          : configuration clause.
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  tex: depends: libbar(c)
            #       depends: libfoo(c)
            #
            #  tix: depends: libbar(c)
            #       depends: tex(c)
            #
            $* tex tix --verbose 1 2>!;

            $* tix ?tex/0.2.0 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              %.*
              trace: collect_build: add tix/1.0.0
              trace: collect_build_prerequisites: skip configured tix/1.0.0
              trace: execute_plan: simulate: yes
              %.*
              trace: evaluate_dependency: tex/1.0.0: update to tex/0.2.0
              %.*
              trace: pkg_build: refine package collection/plan execution
              %.*
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tix/1.0.0 due to dependency tex/0.2.0
              trace: postponed_configurations::add: create {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): skip being built existing dependent tex of dependency libbar
              trace: collect_build_prerequisites: pre-reeval tix/1.0.0
              %.*
              trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: reeval tix/1.0.0
              %.*
              trace: postponed_configurations::add: add {tix^ 1,1: libbar} to {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent tix/1.0.0 results in {tix^ | libbar->{tix/1,1}}
              trace: collect_build_prerequisites: re-evaluated tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {tix^ | libbar->{tix/1,1}}
              %.*
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              %.*
              trace: collect_build: pick tex/0.2.0 over tex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency tex/0.2.0 of dependent tix/1.0.0
              trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
              trace: collect_build_prerequisites: postpone tix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {tix^ | libbar->{tix/1,1}}!
              trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): skip being built existing dependent tix of dependency tex
              trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
              %.*
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin tex/0.2.0
              %.*
              trace: collect_build_prerequisites: dep-postpone dependency libbar/1.0.0 of dependent tex/0.2.0 since already in cluster {tix^ | libbar->{tix/1,1}}!
              %.*
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/0.2.0
              trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
              trace: collect_build_prerequisites: postpone tex/0.2.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
              trace: collect_build_prerequisites: resume tix/1.0.0
              trace: collect_build_prerequisites: end tix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
              trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
              %.*
              trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
              trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
              %.*
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/0.2.0
              trace: collect_build_prerequisites: resume tex/0.2.0
              trace: collect_build_prerequisites: end tex/0.2.0
              trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
              trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
              trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
              trace: collect_build_postponed (1): end {tix^ | libbar->{tix/1,1}}
              trace: collect_build_postponed (0): end
              %.*
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                downgrade/unhold tex/0.2.0
                  config.tex.extras=true (set by tix)
                reconfigure/update tix/1.0.0
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_drop tix
          }
        }
      }

      : indirect
      :
      {
        +$clone_cfg

        : args-tax-dex-dix
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tax: depends: libbar(c)
          #       depends: libfoo
          #
          #  bar: depends: libbar(c)
          #
          #  dex: depends: bar(c)
          #       depends: libfoo(c)
          #
          #  dox: dex(c)
          #
          #  dix: depends: libbar(c)
          #       depends: libbox(c) # causes postponement and initial cluster finished negotiating
          #       depends: dox(c)
          #
          $* tax dex dix 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tax/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add dix/1.0.0
            trace: collect_build_prerequisites: begin tax/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
            trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone tax/1.0.0
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_prerequisites: begin dix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: add {dix 1,1: libbar} to {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {dix tax | libbar->{dix/1,1 tax/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {dix tax | libbar->{dix/1,1 tax/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | libbox->{dix/2,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
            trace: collect_build_prerequisites: resume tax/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent tax/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end tax/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {dix tax | libbar->{dix/1,1 tax/1,1}}!
            trace: collect_build_postponed (2): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {dix tax | libbar->{dix/1,1 tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tax/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add dix/1.0.0
            trace: collect_build_prerequisites: begin tax/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
            trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone tax/1.0.0
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_prerequisites: begin dix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: add {dix 1,1: libbar} to {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {dix tax | libbar->{dix/1,1 tax/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {dix tax | libbar->{dix/1,1 tax/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | libbox->{dix/2,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
            trace: collect_build_prerequisites: resume tax/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
            trace: collect_build_prerequisites: end tax/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {dix tax | libbar->{dix/1,1 tax/1,1}}!
            trace: collect_build_postponed (2): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {dix tax | libbar->{dix/1,1 tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (3): begin {dix | libbox->{dix/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {dix | libbox->{dix/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | dox->{dix/3,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {dix | libbox->{dix/2,1}}!
            trace: collect_build_postponed (4): begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            trace: collect_build_prerequisites: end dex/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
            trace: collect_build_postponed (5): begin {dix | dox->{dix/3,1}}
            %.*
            trace: collect_build_postponed (5): cfg-negotiate begin {dix | dox->{dix/3,1}}
            %.*
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dox/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (dex), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tax/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add dix/1.0.0
            trace: collect_build_prerequisites: begin tax/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
            trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone tax/1.0.0
            trace: pkg_build: dep-postpone user-specified dex
            trace: collect_build_prerequisites: begin dix/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: add {dix 1,1: libbar} to {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {dix tax | libbar->{dix/1,1 tax/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {dix tax | libbar->{dix/1,1 tax/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | libbox->{dix/2,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
            trace: collect_build_prerequisites: resume tax/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
            trace: collect_build_prerequisites: end tax/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {dix tax | libbar->{dix/1,1 tax/1,1}}!
            trace: collect_build_postponed (2): begin {dix | libbox->{dix/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dix | libbox->{dix/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | dox->{dix/3,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {dix | libbox->{dix/2,1}}!
            trace: collect_build_postponed (3): begin {dix | dox->{dix/3,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {dix | dox->{dix/3,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dox/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
            trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
            trace: collect_build_prerequisites: postpone dox/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            trace: collect_build_prerequisites: end dix/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {dix | dox->{dix/3,1}}!
            trace: collect_build_postponed (4): begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent dox/1.0.0
            trace: collect_build_prerequisites: resume dox/1.0.0
            trace: collect_build_prerequisites: end dox/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {dox | dex->{dox/1,1}}!
            trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {dix tax | libbar->{dix/1,1 tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            trace: collect_build_prerequisites: end dex/1.0.0
            trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
            trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
            trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
            trace: collect_build_postponed (4): end {dox | dex->{dox/1,1}}
            trace: collect_build_postponed (3): end {dix | dox->{dix/3,1}}
            trace: collect_build_postponed (2): end {dix | libbox->{dix/2,1}}
            trace: collect_build_postponed (1): end {dix tax | libbar->{dix/1,1 tax/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tax configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !dex configured 1.0.0
              bar configured 1.0.0
                libbar configured 1.0.0
              libfoo configured 1.0.0
            !dix configured 1.0.0
              dox configured 1.0.0
                !dex configured 1.0.0
                  bar configured 1.0.0
                    libbar configured 1.0.0
                  libfoo configured 1.0.0
              libbar configured 1.0.0
              libbox configured 1.0.0
            EOO

          $pkg_drop tax dex dix --drop-dependent
        }

        : args-dix
        :
        : As above but with the different command-line arguments which results
        : in the different cluster list at the moment of the cycle detection.
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  bar: depends: libbar(c)
          #
          #  dex: depends: bar(c)
          #       depends: libfoo(c)
          #
          #  dox: dex(c)
          #
          #  dix: depends: libbar(c)
          #       depends: libbox(c) # causes postponement and initial cluster finished negotiating
          #       depends: dox(c)
          #
          $* dix 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add dix/1.0.0
            trace: collect_build_prerequisites: begin dix/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | libbar->{dix/1,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {dix | libbar->{dix/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {dix | libbar->{dix/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | libbox->{dix/2,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {dix | libbar->{dix/1,1}}!
            trace: collect_build_postponed (2): begin {dix | libbox->{dix/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dix | libbox->{dix/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent dix/1.0.0
            trace: postponed_configurations::add: create {dix | dox->{dix/3,1}}
            trace: collect_build_prerequisites: postpone dix/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {dix | libbox->{dix/2,1}}!
            trace: collect_build_postponed (3): begin {dix | dox->{dix/3,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {dix | dox->{dix/3,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dox/1.0.0
            %.*
            trace: collect_build: add dex/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
            trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
            trace: collect_build_prerequisites: postpone dox/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dix/1.0.0
            trace: collect_build_prerequisites: resume dix/1.0.0
            trace: collect_build_prerequisites: end dix/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {dix | dox->{dix/3,1}}!
            trace: collect_build_postponed (4): begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent dox/1.0.0
            trace: collect_build_prerequisites: resume dox/1.0.0
            trace: collect_build_prerequisites: end dox/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {dox | dex->{dox/1,1}}!
            trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {dix | libbar->{dix/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            trace: collect_build_prerequisites: end dex/1.0.0
            trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
            trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
            trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
            trace: collect_build_postponed (4): end {dox | dex->{dox/1,1}}
            trace: collect_build_postponed (3): end {dix | dox->{dix/3,1}}
            trace: collect_build_postponed (2): end {dix | libbox->{dix/2,1}}
            trace: collect_build_postponed (1): end {dix | libbar->{dix/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !dix configured 1.0.0
              dox configured 1.0.0
                dex configured 1.0.0
                  bar configured 1.0.0
                    libbar configured 1.0.0
                  libfoo configured 1.0.0
              libbar configured 1.0.0
              libbox configured 1.0.0
            EOO

          $pkg_drop dix
        }

        : args-tax-dex-diz
        :
        : Note that diz is a correct version of dix, which fixes the
        : configuration cycle.
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  tax: depends: libbar(c)
          #       depends: libfoo
          #
          #  bar: depends: libbar(c)
          #
          #  dex: depends: bar(c)
          #       depends: libfoo(c)
          #
          #  dox: dex(c)
          #
          #  diz: depends: dox(c)
          #       depends: libbox(c)
          #       depends: libbar(c)
          #
          $* tax dex diz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tax/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add diz/1.0.0
            trace: collect_build_prerequisites: begin tax/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
            trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone tax/1.0.0
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_prerequisites: begin diz/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | dox->{diz/1,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
            trace: collect_build_prerequisites: resume tax/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: no cfg-clause for dependency libfoo/1.0.0 of dependent tax/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_prerequisites: end tax/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
            trace: collect_build_postponed (2): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {tax | libbar->{tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tax/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add diz/1.0.0
            trace: collect_build_prerequisites: begin tax/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
            trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone tax/1.0.0
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_prerequisites: begin diz/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | dox->{diz/1,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
            trace: collect_build_prerequisites: resume tax/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
            trace: collect_build_prerequisites: end tax/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
            trace: collect_build_postponed (2): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {tax | libbar->{tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (3): begin {diz | dox->{diz/1,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {diz | dox->{diz/1,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dox/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (dex), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add tax/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add diz/1.0.0
            trace: collect_build_prerequisites: begin tax/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tax/1.0.0
            trace: postponed_configurations::add: create {tax | libbar->{tax/1,1}}
            trace: collect_build_prerequisites: postpone tax/1.0.0
            trace: pkg_build: dep-postpone user-specified dex
            trace: collect_build_prerequisites: begin diz/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | dox->{diz/1,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {tax | libbar->{tax/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {tax | libbar->{tax/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tax/1.0.0
            trace: collect_build_prerequisites: resume tax/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
            trace: collect_build_prerequisites: end tax/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {tax | libbar->{tax/1,1}}!
            trace: collect_build_postponed (2): begin {diz | dox->{diz/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {diz | dox->{diz/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dox/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
            trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
            trace: collect_build_prerequisites: postpone dox/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
            trace: collect_build_prerequisites: resume diz/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {diz | dox->{diz/1,1}}!
            trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
            trace: collect_build_prerequisites: resume dox/1.0.0
            trace: collect_build_prerequisites: end dox/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
            trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
            trace: collect_build_prerequisites: resume diz/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: add {diz 3,1: libbar} to {tax | libbar->{tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent diz/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent diz/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end diz/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {diz | libbox->{diz/2,1}}!
            trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {diz tax | libbar->{diz/3,1 tax/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            trace: collect_build_prerequisites: end dex/1.0.0
            trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
            trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
            trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
            trace: collect_build_postponed (4): end {diz | libbox->{diz/2,1}}
            trace: collect_build_postponed (3): end {dox | dex->{dox/1,1}}
            trace: collect_build_postponed (2): end {diz | dox->{diz/1,1}}
            trace: collect_build_postponed (1): end {tax | libbar->{tax/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !tax configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !dex configured 1.0.0
              bar configured 1.0.0
                libbar configured 1.0.0
              libfoo configured 1.0.0
            !diz configured 1.0.0
              dox configured 1.0.0
                !dex configured 1.0.0
                  bar configured 1.0.0
                    libbar configured 1.0.0
                  libfoo configured 1.0.0
              libbar configured 1.0.0
              libbox configured 1.0.0
            EOO

          $pkg_drop tax dex diz --drop-dependent
        }

        : args-diz
        :
        : Note that diz is a correct version of dix, which fixes the
        : configuration cycle.
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  bar: depends: libbar(c)
          #
          #  dex: depends: bar(c)
          #       depends: libfoo(c)
          #
          #  dox: dex(c)
          #
          #  diz: depends: dox(c)
          #       depends: libbox(c)
          #       depends: libbar(c)
          #
          $* diz 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add diz/1.0.0
            trace: collect_build_prerequisites: begin diz/1.0.0
            %.*
            trace: collect_build: add dox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | dox->{diz/1,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {diz | dox->{diz/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {diz | dox->{diz/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dox/1.0.0
            %.*
            trace: collect_build: add dex/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
            trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
            trace: collect_build_prerequisites: postpone dox/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent diz/1.0.0
            trace: collect_build_prerequisites: resume diz/1.0.0
            %.*
            trace: collect_build: add libbox/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {diz | dox->{diz/1,1}}!
            trace: collect_build_postponed (2): begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {dox | dex->{dox/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dox/1.0.0
            trace: collect_build_prerequisites: resume dox/1.0.0
            trace: collect_build_prerequisites: end dox/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {dox | dex->{dox/1,1}}!
            trace: collect_build_postponed (3): begin {diz | libbox->{diz/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {diz | libbox->{diz/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbox/1.0.0
            trace: collect_build_prerequisites: end libbox/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent diz/1.0.0
            trace: collect_build_prerequisites: resume diz/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
            trace: postponed_configurations::add: create {diz | libbar->{diz/3,1}}
            trace: collect_build_prerequisites: postpone diz/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {diz | libbox->{diz/2,1}}!
            trace: collect_build_postponed (4): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {diz | libbar->{diz/3,1}}
            trace: collect_build_prerequisites: postpone bar/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (5): begin {bar diz | libbar->{bar/1,1 diz/3,1}}
            %.*
            trace: collect_build_postponed (5): cfg-negotiate begin {bar diz | libbar->{bar/1,1 diz/3,1}}
            %.*
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent bar/1.0.0
            trace: collect_build_prerequisites: resume bar/1.0.0
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent diz/1.0.0
            trace: collect_build_prerequisites: resume diz/1.0.0
            trace: collect_build_prerequisites: end diz/1.0.0
            trace: collect_build_postponed (5): cfg-negotiate end {bar diz | libbar->{bar/1,1 diz/3,1}}!
            trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
            %.*
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            trace: collect_build_prerequisites: end dex/1.0.0
            trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
            trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
            trace: collect_build_postponed (5): end {bar diz | libbar->{bar/1,1 diz/3,1}}
            trace: collect_build_postponed (4): end {dex | bar->{dex/1,1}}
            trace: collect_build_postponed (3): end {diz | libbox->{diz/2,1}}
            trace: collect_build_postponed (2): end {dox | dex->{dox/1,1}}
            trace: collect_build_postponed (1): end {diz | dox->{diz/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !diz configured 1.0.0
              dox configured 1.0.0
                dex configured 1.0.0
                  bar configured 1.0.0
                    libbar configured 1.0.0
                  libfoo configured 1.0.0
              libbar configured 1.0.0
              libbox configured 1.0.0
            EOO

          $pkg_drop diz
        }

        : depends-depends-conflict
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  bar: depends: libbar(c)
          #
          #  dex: depends: bar(c)
          #       depends: libfoo(c)
          #
          #  buc: depends: libfoo(c)
          #       depends: bux(c)
          #
          #  bux: depends: libbar(c)
          #
          $* bar dex buc bux 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add buc/1.0.0
            trace: collect_build: add bux/1.0.0
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: create {bar | libbar->{bar/1,1}}
            trace: collect_build_prerequisites: postpone bar/1.0.0
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (bar), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add buc/1.0.0
            trace: collect_build: add bux/1.0.0
            trace: pkg_build: dep-postpone user-specified bar
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_prerequisites: begin buc/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent buc/1.0.0
            trace: postponed_configurations::add: create {buc | libfoo->{buc/1,1}}
            trace: collect_build_prerequisites: postpone buc/1.0.0
            trace: collect_build_prerequisites: begin bux/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bux/1.0.0
            trace: postponed_configurations::add: create {bux | libbar->{bux/1,1}}
            trace: collect_build_prerequisites: postpone bux/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: add {bar 1,1: libbar} to {bux | libbar->{bux/1,1}}
            trace: collect_build_prerequisites: postpone bar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: add {dex 2,1: libfoo} to {buc | libfoo->{buc/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (2): begin {buc dex | libfoo->{buc/1,1 dex/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {buc dex | libfoo->{buc/1,1 dex/2,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent buc/1.0.0
            trace: collect_build_prerequisites: resume buc/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency bux/1.0.0 of dependent buc/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (bux), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add bar/1.0.0
            trace: collect_build: add dex/1.0.0
            trace: collect_build: add buc/1.0.0
            trace: collect_build: add bux/1.0.0
            trace: pkg_build: dep-postpone user-specified bar
            trace: collect_build_prerequisites: begin dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_prerequisites: begin buc/1.0.0
            %.*
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent buc/1.0.0
            trace: postponed_configurations::add: create {buc | libfoo->{buc/1,1}}
            trace: collect_build_prerequisites: postpone buc/1.0.0
            trace: pkg_build: dep-postpone user-specified bux
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {dex | bar->{dex/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {dex | bar->{dex/1,1}}
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bar/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
            trace: postponed_configurations::add: create {bar | libbar->{bar/1,1}}
            trace: collect_build_prerequisites: postpone bar/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
            trace: postponed_configurations::add: add {dex 2,1: libfoo} to {buc | libfoo->{buc/1,1}}
            trace: collect_build_prerequisites: postpone dex/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {dex | bar->{dex/1,1}}!
            trace: collect_build_postponed (2): begin {buc dex | libfoo->{buc/1,1 dex/2,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {buc dex | libfoo->{buc/1,1 dex/2,1}}
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent buc/1.0.0
            trace: collect_build_prerequisites: resume buc/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency bux/1.0.0 of dependent buc/1.0.0
            trace: postponed_configurations::add: create {buc | bux->{buc/2,1}}
            trace: collect_build_prerequisites: postpone buc/1.0.0
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dex/1.0.0
            trace: collect_build_prerequisites: resume dex/1.0.0
            trace: collect_build_prerequisites: end dex/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {buc dex | libfoo->{buc/1,1 dex/2,1}}!
            trace: collect_build_postponed (3): begin {bar | libbar->{bar/1,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {bar | libbar->{bar/1,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bar/1.0.0
            trace: collect_build_prerequisites: resume bar/1.0.0
            trace: collect_build_prerequisites: end bar/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {bar | libbar->{bar/1,1}}!
            trace: collect_build_postponed (4): begin {buc | bux->{buc/2,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {buc | bux->{buc/2,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bux/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bux/1.0.0
            trace: postponed_configurations::add: add {bux 1,1: libbar} to {bar | libbar->{bar/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bux/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bux/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end bux/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent buc/1.0.0
            trace: collect_build_prerequisites: resume buc/1.0.0
            trace: collect_build_prerequisites: end buc/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {buc | bux->{buc/2,1}}!
            trace: collect_build_postponed (4): end {buc | bux->{buc/2,1}}
            trace: collect_build_postponed (3): end {bar | libbar->{bar/1,1}}
            trace: collect_build_postponed (2): end {buc dex | libfoo->{buc/1,1 dex/2,1}}
            trace: collect_build_postponed (1): end {dex | bar->{dex/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            build plan:
              new libfoo/1.0.0 (required by buc, dex)
                config.libfoo.extras=true (set by buc)
              new libbar/1.0.0 (required by bar, bux)
                config.libbar.extras=true (set by bar)
              new bar/1.0.0
                config.bar.extras=true (set by dex)
              new dex/1.0.0
              new bux/1.0.0
                config.bux.extras=true (set by buc)
              new buc/1.0.0
            trace: execute_plan: simulate: no
            %.*
            EOE

          $pkg_status -r >>EOO;
            !bar configured 1.0.0
              libbar configured 1.0.0
            !dex configured 1.0.0
              !bar configured 1.0.0
                libbar configured 1.0.0
              libfoo configured 1.0.0
            !bux configured 1.0.0
              libbar configured 1.0.0
            !buc configured 1.0.0
              !bux configured 1.0.0
                libbar configured 1.0.0
              libfoo configured 1.0.0
            EOO

          $pkg_drop bar dex buc bux
        }

        : package-depends-conflict
        :
        {
          $clone_cfg;

          #  Dependencies:
          #
          #  baz: depends: {libbar libfoo} (c)
          #
          #  bas: depends: libbar(c)
          #       depends: bus (c)
          #
          #  bus: depends: libbaz(c)
          #       depends: foo (c)
          #
          #  foo: depends: libfoo(c)
          #
          #  bat: depends: libbaz(c)
          #
          $* baz bas bus foo bat 2>>~%EOE%;
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add baz/1.0.0
            trace: collect_build: add bas/1.0.0
            trace: collect_build: add bus/1.0.0
            trace: collect_build: add foo/1.0.0
            trace: collect_build: add bat/1.0.0
            trace: collect_build_prerequisites: begin baz/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent baz/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent baz/1.0.0
            trace: postponed_configurations::add: create {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone baz/1.0.0
            trace: collect_build_prerequisites: begin bas/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bas/1.0.0
            trace: postponed_configurations::add: add {bas 1,1: libbar} to {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone bas/1.0.0
            trace: collect_build_prerequisites: begin bus/1.0.0
            %.*
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
            trace: postponed_configurations::add: create {bus | libbaz->{bus/1,1}}
            trace: collect_build_prerequisites: postpone bus/1.0.0
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: add {foo 1,1: libfoo} to {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone foo/1.0.0
            trace: collect_build_prerequisites: begin bat/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
            trace: postponed_configurations::add: add {bat 1,1: libbaz} to {bus | libbaz->{bus/1,1}}
            trace: collect_build_prerequisites: postpone bat/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {bas baz foo | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1 foo/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {bas baz foo | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1 foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
            trace: collect_build_prerequisites: resume bas/1.0.0
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (bus), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add baz/1.0.0
            trace: collect_build: add bas/1.0.0
            trace: collect_build: add bus/1.0.0
            trace: collect_build: add foo/1.0.0
            trace: collect_build: add bat/1.0.0
            trace: collect_build_prerequisites: begin baz/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent baz/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent baz/1.0.0
            trace: postponed_configurations::add: create {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone baz/1.0.0
            trace: collect_build_prerequisites: begin bas/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bas/1.0.0
            trace: postponed_configurations::add: add {bas 1,1: libbar} to {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone bas/1.0.0
            trace: pkg_build: dep-postpone user-specified bus
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: add {foo 1,1: libfoo} to {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone foo/1.0.0
            trace: collect_build_prerequisites: begin bat/1.0.0
            %.*
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
            trace: postponed_configurations::add: create {bat | libbaz->{bat/1,1}}
            trace: collect_build_prerequisites: postpone bat/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {bas baz foo | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1 foo/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {bas baz foo | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1 foo/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
            trace: collect_build_prerequisites: resume bas/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
            trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
            trace: collect_build_prerequisites: postpone bas/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
            trace: collect_build_prerequisites: resume baz/1.0.0
            trace: collect_build_prerequisites: end baz/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
            trace: collect_build_prerequisites: resume foo/1.0.0
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {bas baz foo | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1 foo/1,1}}!
            trace: collect_build_postponed (2): begin {bat | libbaz->{bat/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {bat | libbaz->{bat/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bat/1.0.0
            trace: collect_build_prerequisites: resume bat/1.0.0
            trace: collect_build_prerequisites: end bat/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {bat | libbaz->{bat/1,1}}!
            trace: collect_build_postponed (3): begin {bas | bus->{bas/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {bas | bus->{bas/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bus/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
            trace: postponed_configurations::add: add {bus 1,1: libbaz} to {bat | libbaz->{bat/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bus/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbaz/1.0.0 of dependent bus/1.0.0 is already (being) recursively collected, skipping
            %.*
            trace: collect_build_prerequisites: cannot cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0 (collected prematurely), throwing postpone_dependency
            trace: pkg_build: collection failed due to prematurely collected dependency (foo), retry from scratch
            %.*
            trace: pkg_build: refine package collection/plan execution from scratch
            %.*
            trace: collect_build: add baz/1.0.0
            trace: collect_build: add bas/1.0.0
            trace: collect_build: add bus/1.0.0
            trace: collect_build: add foo/1.0.0
            trace: collect_build: add bat/1.0.0
            trace: collect_build_prerequisites: begin baz/1.0.0
            %.*
            trace: collect_build: add libbar/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent baz/1.0.0
            trace: collect_build: add libfoo/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent baz/1.0.0
            trace: postponed_configurations::add: create {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone baz/1.0.0
            trace: collect_build_prerequisites: begin bas/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bas/1.0.0
            trace: postponed_configurations::add: add {bas 1,1: libbar} to {baz | libbar->{baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_prerequisites: postpone bas/1.0.0
            trace: pkg_build: dep-postpone user-specified bus
            trace: pkg_build: dep-postpone user-specified foo
            trace: collect_build_prerequisites: begin bat/1.0.0
            %.*
            trace: collect_build: add libbaz/1.0.0
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
            trace: postponed_configurations::add: create {bat | libbaz->{bat/1,1}}
            trace: collect_build_prerequisites: postpone bat/1.0.0
            trace: collect_build_postponed (0): begin
            trace: collect_build_postponed (1): begin {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build_postponed (1): cfg-negotiate begin {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}
            %.*
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbar/1.0.0
            trace: collect_build_prerequisites: end libbar/1.0.0
            trace: collect_build_prerequisites: begin libfoo/1.0.0
            trace: collect_build_prerequisites: end libfoo/1.0.0
            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
            trace: collect_build_prerequisites: resume bas/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
            trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
            trace: collect_build_prerequisites: postpone bas/1.0.0
            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
            trace: collect_build_prerequisites: resume baz/1.0.0
            trace: collect_build_prerequisites: end baz/1.0.0
            trace: collect_build_postponed (1): cfg-negotiate end {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}!
            trace: collect_build_postponed (2): begin {bat | libbaz->{bat/1,1}}
            %.*
            trace: collect_build_postponed (2): cfg-negotiate begin {bat | libbaz->{bat/1,1}}
            %.*
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin libbaz/1.0.0
            trace: collect_build_prerequisites: end libbaz/1.0.0
            trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bat/1.0.0
            trace: collect_build_prerequisites: resume bat/1.0.0
            trace: collect_build_prerequisites: end bat/1.0.0
            trace: collect_build_postponed (2): cfg-negotiate end {bat | libbaz->{bat/1,1}}!
            trace: collect_build_postponed (3): begin {bas | bus->{bas/2,1}}
            %.*
            trace: collect_build_postponed (3): cfg-negotiate begin {bas | bus->{bas/2,1}}
            %.*
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin bus/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
            trace: postponed_configurations::add: add {bus 1,1: libbaz} to {bat | libbaz->{bat/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bus/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libbaz/1.0.0 of dependent bus/1.0.0 is already (being) recursively collected, skipping
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0
            trace: postponed_configurations::add: create {bus | foo->{bus/2,1}}
            trace: collect_build_prerequisites: postpone bus/1.0.0
            trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bas/1.0.0
            trace: collect_build_prerequisites: resume bas/1.0.0
            trace: collect_build_prerequisites: end bas/1.0.0
            trace: collect_build_postponed (3): cfg-negotiate end {bas | bus->{bas/2,1}}!
            trace: collect_build_postponed (4): begin {bus | foo->{bus/2,1}}
            %.*
            trace: collect_build_postponed (4): cfg-negotiate begin {bus | foo->{bus/2,1}}
            %.*
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
            trace: collect_build_prerequisites: begin foo/1.0.0
            %.*
            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
            trace: postponed_configurations::add: add {foo 1,1: libfoo} to {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}!
            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent foo/1.0.0 is negotiated
            trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent foo/1.0.0 is already (being) recursively collected, skipping
            trace: collect_build_prerequisites: end foo/1.0.0
            trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
            trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent bus/1.0.0
            trace: collect_build_prerequisites: resume bus/1.0.0
            trace: collect_build_prerequisites: end bus/1.0.0
            trace: collect_build_postponed (4): cfg-negotiate end {bus | foo->{bus/2,1}}!
            trace: collect_build_postponed (4): end {bus | foo->{bus/2,1}}
            trace: collect_build_postponed (3): end {bas | bus->{bas/2,1}}
            trace: collect_build_postponed (2): end {bat | libbaz->{bat/1,1}}
            trace: collect_build_postponed (1): end {bas baz | libbar->{bas/1,1 baz/1,1} libfoo->{baz/1,1}}
            trace: collect_build_postponed (0): end
            trace: execute_plan: simulate: yes
            %.*
            EOE

          $pkg_status -r >>EOO;
            !baz configured 1.0.0
              libbar configured 1.0.0
              libfoo configured 1.0.0
            !foo configured 1.0.0
              libfoo configured 1.0.0
            !bus configured 1.0.0
              !foo configured 1.0.0
                libfoo configured 1.0.0
              libbaz configured 1.0.0
            !bas configured 1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
                libbaz configured 1.0.0
              libbar configured 1.0.0
            !bat configured 1.0.0
              libbaz configured 1.0.0
            EOO

          $pkg_drop baz bas bus foo bat
        }

        : existing
        :
        {
          +$clone_cfg

          : negotiate
          :
          {
            $clone_cfg;

            #  Dependencies:
            #
            #  bar: depends: libbar(c)
            #
            #  dex: depends: bar(c)
            #       depends: libfoo(c)
            #
            #  dox: dex(c)
            #
            #  dix: depends: libbar(c)
            #       depends: libbox(c) # causes postponement and initial cluster finished negotiating
            #       depends: dox(c)
            #
            $* dex --verbose 1 2>!;

            $* dix 2>&1 | $filter 2>>~%EOE%;
              %.*
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add dix/1.0.0
              trace: collect_build_prerequisites: begin dix/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent dix/1.0.0
              trace: postponed_configurations::add: create {dix | libbar->{dix/1,1}}
              trace: collect_build_prerequisites: postpone dix/1.0.0
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {dix | libbar->{dix/1,1}}
              trace: collect_build_prerequisites: pre-reeval bar/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
              trace: collect_build_postponed (1): re-evaluate existing dependents for {dix | libbar->{dix/1,1}}
              trace: collect_build: add bar/1.0.0
              trace: collect_build_prerequisites: reeval bar/1.0.0
              trace: postponed_configurations::add: add {bar^ 1,1: libbar} to {dix | libbar->{dix/1,1}}
              trace: collect_build_prerequisites: re-evaluating dependent bar/1.0.0 results in {bar^ dix | libbar->{bar/1,1 dix/1,1}}
              trace: collect_build_prerequisites: re-evaluated bar/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {bar^ dix | libbar->{bar/1,1 dix/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/1.0.0
              trace: collect_build_prerequisites: resume bar/1.0.0
              trace: collect_build_prerequisites: end bar/1.0.0
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dix/1.0.0
              trace: collect_build_prerequisites: resume dix/1.0.0
              trace: collect_build: add libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent dix/1.0.0
              trace: postponed_configurations::add: create {dix | libbox->{dix/2,1}}
              trace: collect_build_prerequisites: postpone dix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {bar^ dix | libbar->{bar/1,1 dix/1,1}}!
              trace: collect_build_postponed (2): begin {dix | libbox->{dix/2,1}}
              trace: collect_build_postponed (2): cfg-negotiate begin {dix | libbox->{dix/2,1}}
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin libbox/1.0.0
              trace: collect_build_prerequisites: end libbox/1.0.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dix/1.0.0
              trace: collect_build_prerequisites: resume dix/1.0.0
              trace: collect_build: add dox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent dix/1.0.0
              trace: postponed_configurations::add: create {dix | dox->{dix/3,1}}
              trace: collect_build_prerequisites: postpone dix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {dix | libbox->{dix/2,1}}!
              trace: collect_build_postponed (3): begin {dix | dox->{dix/3,1}}
              trace: collect_build_postponed (3): cfg-negotiate begin {dix | dox->{dix/3,1}}
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin dox/1.0.0
              trace: collect_build: add dex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
              trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
              trace: collect_build_prerequisites: postpone dox/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dix/1.0.0
              trace: collect_build_prerequisites: resume dix/1.0.0
              trace: collect_build_prerequisites: end dix/1.0.0
              trace: collect_build_postponed (3): cfg-negotiate end {dix | dox->{dix/3,1}}!
              trace: collect_build_postponed (4): begin {dox | dex->{dox/1,1}}
              trace: collect_build_postponed (4): cfg-negotiate begin {dox | dex->{dox/1,1}}
              trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin dex/1.0.0
              trace: collect_build_prerequisites: cannot cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
              trace: pkg_build: collection failed due to prematurely collected dependency (bar), retry from scratch
              trace: pkg_build: refine package collection/plan execution from scratch
              trace: collect_build: add dix/1.0.0
              trace: collect_build_prerequisites: begin dix/1.0.0
              trace: collect_build: add libbar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent dix/1.0.0
              trace: postponed_configurations::add: create {dix | libbar->{dix/1,1}}
              trace: collect_build_prerequisites: postpone dix/1.0.0
              trace: collect_build_postponed (0): begin
              trace: collect_build_postponed (1): begin {dix | libbar->{dix/1,1}}
              trace: collect_build_prerequisites: pre-reeval bar/1.0.0
              trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
              trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
              trace: collect_build: add bar/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate begin {dix | libbar->{dix/1,1}}
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libbar/1.0.0
              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent dix/1.0.0
              trace: collect_build_prerequisites: resume dix/1.0.0
              trace: collect_build: add libbox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent dix/1.0.0
              trace: postponed_configurations::add: create {dix | libbox->{dix/2,1}}
              trace: collect_build_prerequisites: postpone dix/1.0.0
              trace: collect_build_postponed (1): cfg-negotiate end {dix | libbar->{dix/1,1}}!
              trace: collect_build_postponed (2): begin {dix | libbox->{dix/2,1}}
              trace: collect_build_postponed (2): cfg-negotiate begin {dix | libbox->{dix/2,1}}
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin libbox/1.0.0
              trace: collect_build_prerequisites: end libbox/1.0.0
              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent dix/1.0.0
              trace: collect_build_prerequisites: resume dix/1.0.0
              trace: collect_build: add dox/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of dependent dix/1.0.0
              trace: postponed_configurations::add: create {dix | dox->{dix/3,1}}
              trace: collect_build_prerequisites: postpone dix/1.0.0
              trace: collect_build_postponed (2): cfg-negotiate end {dix | libbox->{dix/2,1}}!
              trace: collect_build_postponed (3): begin {dix | dox->{dix/3,1}}
              trace: collect_build_postponed (3): cfg-negotiate begin {dix | dox->{dix/3,1}}
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin dox/1.0.0
              trace: collect_build: add dex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
              trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
              trace: collect_build_prerequisites: postpone dox/1.0.0
              trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dix/1.0.0
              trace: collect_build_prerequisites: resume dix/1.0.0
              trace: collect_build_prerequisites: end dix/1.0.0
              trace: collect_build_postponed (3): cfg-negotiate end {dix | dox->{dix/3,1}}!
              trace: collect_build_postponed (4): begin {dox | dex->{dox/1,1}}
              trace: collect_build_postponed (4): cfg-negotiate begin {dox | dex->{dox/1,1}}
              trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin dex/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
              trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
              trace: collect_build_prerequisites: postpone dex/1.0.0
              trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent dox/1.0.0
              trace: collect_build_prerequisites: resume dox/1.0.0
              trace: collect_build_prerequisites: end dox/1.0.0
              trace: collect_build_postponed (4): cfg-negotiate end {dox | dex->{dox/1,1}}!
              trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
              trace: collect_build_postponed (5): skip being built existing dependent dex of dependency bar
              trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
              trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: begin bar/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
              trace: postponed_configurations::add: add {bar 1,1: libbar} to {dix | libbar->{dix/1,1}}!
              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
              trace: collect_build_prerequisites: end bar/1.0.0
              trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
              trace: collect_build_prerequisites: resume dex/1.0.0
              trace: collect_build: add libfoo/1.0.0
              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
              trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
              trace: collect_build_prerequisites: postpone dex/1.0.0
              trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
              trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
              trace: collect_build_postponed (6): skip being built existing dependent dex of dependency libfoo
              trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
              trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
              trace: collect_build_prerequisites: skip configured libfoo/1.0.0
              trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
              trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
              trace: collect_build_prerequisites: resume dex/1.0.0
              trace: collect_build_prerequisites: end dex/1.0.0
              trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
              trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
              trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
              trace: collect_build_postponed (4): end {dox | dex->{dox/1,1}}
              trace: collect_build_postponed (3): end {dix | dox->{dix/3,1}}
              trace: collect_build_postponed (2): end {dix | libbox->{dix/2,1}}
              trace: collect_build_postponed (1): end {dix | libbar->{dix/1,1}}
              trace: collect_build_postponed (0): end
              trace: execute_plan: simulate: yes
              %.*
              build plan:
                new libbox/1.0.0 (required by dix)
                  config.libbox.extras=true (set by dix)
                new dox/1.0.0 (required by dix)
                  config.dox.extras=true (set by dix)
                new dix/1.0.0
              trace: execute_plan: simulate: no
              %.*
              EOE

            $pkg_status -r >>EOO;
              !dex configured 1.0.0
                bar configured 1.0.0
                  libbar configured 1.0.0
                libfoo configured 1.0.0
              !dix configured 1.0.0
                dox configured 1.0.0
                  !dex configured 1.0.0
                    bar configured 1.0.0
                      libbar configured 1.0.0
                    libfoo configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
              EOO

            # @@ Note that if --drop-dependent is unspecified, the following
            #    command fails with:
            #
            #    following dependent packages will have to be dropped as well:
            #      dox (requires dex)
            #    error: refusing to drop dependent packages with just --yes
            #      info: specify --drop-dependent to confirm
            #
            #    Feels wrong.
            #
            $pkg_drop --drop-dependent dex dix
          }
        }
      }
    }

    : unaccept-alternative
    :
    {
      +$clone_cfg

      : unacceptable
      :
      {
        $clone_cfg;

        $* foo fox/0.1.0 ?libbar 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/0.1.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/0.1.0
          trace: collect_build_prerequisites: alt-postpone dependent fox/0.1.0 since max index is reached: 0
            info: dependency alternative: libfoo
          {
            prefer
            {
              config.libfoo.extras = true
            }
            accept (false)
          }
          trace: collect_build_prerequisites: postpone fox/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): index 1 collect alt-postponed fox/0.1.0
          trace: collect_build_prerequisites: resume fox/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/0.1.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: collect_build_prerequisites: unable to cfg-negotiate dependency alternative 1,1 for dependent fox/0.1.0, throwing unaccept_alternative
          trace: pkg_build: collection failed due to unacceptable alternative, retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/0.1.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/0.1.0
          trace: collect_build_prerequisites: dependency alternative 1,1 for dependent fox/0.1.0 is unacceptable, skipping
          trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent fox/0.1.0
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: collect_build_prerequisites: end fox/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          trace: evaluate_dependency: libbar/1.0.0: unchanged
          %.*
          trace: evaluate_dependency: libbar/1.0.0: unchanged
          %.*
          build plan:
            new libfoo/1.0.0 (required by foo)
              config.libfoo.extras=true (set by foo)
            new foo/1.0.0
              config.foo.libfoo_extras=true (set by foo)
            new libbar/1.0.0 (required by fox)
            new fox/0.1.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !fox configured !0.1.0 available 1.0.0 0.2.0
            libbar configured 1.0.0
          EOO

        $pkg_drop foo fox
      }

      : negotiation-cycle1
      :
      {
        $clone_cfg;

        $* foo fox/0.2.0 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/0.2.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/0.2.0
          trace: collect_build_prerequisites: alt-postpone dependent fox/0.2.0 since max index is reached: 0
            info: dependency alternative: libfoo
          {
            prefer
            {
              config.libfoo.extras = false
            }
            accept (!$config.libfoo.extras)
          }
          trace: collect_build_prerequisites: postpone fox/0.2.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): index 1 collect alt-postponed fox/0.2.0
          trace: collect_build_prerequisites: resume fox/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/0.2.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: collect_build_prerequisites: cfg-postponing dependent fox/0.2.0 involves (being) negotiated configurations and results in {foo fox | libfoo->{foo/1,1 fox/1,1}}!, throwing retry_configuration
          trace: collect_build_postponed (0): cfg-negotiation of {foo | libfoo->{foo/1,1}} failed due to dependent fox, refining configuration
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): index 1 collect alt-postponed fox/0.2.0
          trace: collect_build_prerequisites: resume fox/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/0.2.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: collect_build_prerequisites: cfg-postponing dependent fox/0.2.0 involves (being) negotiated configurations and results in {foo fox | libfoo->{foo/1,1 fox/1,1}}!, throwing retry_configuration
          trace: collect_build_postponed (0): cfg-negotiation of {foo | libfoo->{foo/1,1}} failed due to dependent fox, refining configuration
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): index 1 collect alt-postponed fox/0.2.0
          trace: collect_build_prerequisites: resume fox/0.2.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/0.2.0
          trace: postponed_configurations::add: add {fox 1,1: libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: collect_build_prerequisites: unable to cfg-negotiate dependency alternative 1,1 for dependent fox/0.2.0, throwing unaccept_alternative
          trace: pkg_build: collection failed due to unacceptable alternative, retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add foo/1.0.0
          trace: collect_build: add fox/0.2.0
          trace: collect_build_prerequisites: begin foo/1.0.0
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/1.0.0
          trace: collect_build_prerequisites: begin fox/0.2.0
          trace: collect_build_prerequisites: dependency alternative 1,1 for dependent fox/0.2.0 is unacceptable, skipping
          trace: collect_build_prerequisites: alt-postpone dependent fox/0.2.0 since max index is reached: 1
            info: dependency alternative: libfoo
          {
            prefer
            {
              config.libfoo.extras = true
            }
            accept (true)
          }
          trace: collect_build_prerequisites: postpone fox/0.2.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
          trace: collect_build_prerequisites: resume foo/1.0.0
          trace: collect_build_prerequisites: end foo/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (1): index 1 collect alt-postponed fox/0.2.0
          trace: collect_build_prerequisites: resume fox/0.2.0
          trace: collect_build_prerequisites: dependency alternative 1,1 for dependent fox/0.2.0 is unacceptable, skipping
          trace: collect_build_prerequisites: alt-postpone dependent fox/0.2.0 since max index is reached: 1
            info: dependency alternative: libfoo
          {
            prefer
            {
              config.libfoo.extras = true
            }
            accept (true)
          }
          trace: collect_build_prerequisites: postpone fox/0.2.0
          trace: collect_build_postponed (1): index 2 collect alt-postponed fox/0.2.0
          trace: collect_build_prerequisites: resume fox/0.2.0
          trace: collect_build_prerequisites: dependency alternative 1,1 for dependent fox/0.2.0 is unacceptable, skipping
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent fox/0.2.0
          trace: postponed_configurations::add: add {fox 1,2: libfoo} to {foo | libfoo->{foo/1,1}}!
          trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent fox/0.2.0 is negotiated
          trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent fox/0.2.0 is already (being) recursively collected, skipping
          trace: collect_build_prerequisites: end fox/0.2.0
          trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            new libfoo/1.0.0 (required by foo, fox)
              config.libfoo.extras=true (set by foo)
            new foo/1.0.0
              config.foo.libfoo_extras=true (set by foo)
            new fox/0.2.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !foo configured 1.0.0
            libfoo configured 1.0.0
          !fox configured !0.2.0 available 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop foo fox
      }

      : negotiation-cycle2
      :
      : Similar to the above but peforms one more negotiation half-cycle (see
      : negotiate_configuration() for details).
      :
      {
        $clone_cfg;

        # Note that this 'one more half-cycle' case doesn't reproduce always
        # and depends on the negotiate_configuration() calls order for the fox
        # and foo dependents. This order is not actually deterministic since
        # depends on the order of these packages in the postponed_packages set
        # (of the set<build_package*> type). Thus, the 'one more half-cycle'
        # case only takes place if the order of the packages as they appear on
        # the command line is preserved.
        #
        $* fox/0.2.0 foo/0.2.0 ?libfoo 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build: add fox/0.2.0
          trace: collect_build: add foo/0.2.0
          trace: collect_build_prerequisites: begin fox/0.2.0
          %.*
          trace: collect_build_prerequisites: alt-postpone dependent fox/0.2.0 since max index is reached: 0
            info: dependency alternative: libfoo
          {
            prefer
            {
              config.libfoo.extras = false
            }

            accept (!$config.libfoo.extras)
          }
          trace: collect_build_prerequisites: postpone fox/0.2.0
          trace: collect_build_prerequisites: begin foo/0.2.0
          %.*
          trace: collect_build_prerequisites: alt-postpone dependent foo/0.2.0 since max index is reached: 0
            info: dependency alternative: libfoo
          {
            require
            {
              config.libfoo.extras = true
            }
          }
          trace: collect_build_prerequisites: postpone foo/0.2.0
          %.*
          %.+: unable to cfg-negotiate dependency alternative 1,1 for dependent fox/0.2.0, throwing unaccept_alternative%
          trace: pkg_build: collection failed due to unacceptable alternative, retry from scratch
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          %.*
          trace: collect_build_prerequisites: dependency alternative 1,1 for dependent fox/0.2.0 is unacceptable, skipping
          %.*
          build plan:
            new libfoo/1.0.0 (required by foo, fox)
              config.libfoo.extras=true (set by foo)
            new fox/0.2.0
            new foo/0.2.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !fox configured !0.2.0 available 1.0.0
            libfoo configured 1.0.0
          !foo configured !0.2.0 available 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop foo fox
      }
    }

    : skip-existing-dependent
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  tix: depends: libbar(c)
      #       depends: tex(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      $* tix ?libfoo/0.1.0 --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !tix configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured !0.1.0 available 1.0.0
        EOO

      $* --upgrade --recursive 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: skip configured tix/1.0.0
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libfoo/0.1.0: update to libfoo/1.0.0
        %.*
        trace: pkg_build: refine package collection/plan execution
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tex/1.0.0 due to dependency libfoo/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tix/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build_prerequisites: reeval tix/1.0.0
        trace: postponed_configurations::add: add {tix^ 1,1: libbar} to {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tix/1.0.0 results in {tex^ tix^ | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_prerequisites: re-evaluated tix/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tex^ tix^ | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: skip configured tix/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tex/1.0.0 due to dependency libfoo/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tix/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tix/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tix/1.0.0
        trace: postponed_configurations::add: add {tix^ 1,1: libbar} to {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tix/1.0.0 results in {tex^ tix^ | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_prerequisites: re-evaluated tix/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tex^ tix^ | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | tex->{tix/2,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tex^ tix^ | libbar->{tex/1,1 tix/1,1}}!
        trace: collect_build_postponed (2): begin {tix | tex->{tix/2,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tix of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tix | tex->{tix/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tex^ tix^ | libbar->{tex/1,1 tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: end tix/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tix | tex->{tix/2,1}}!
        trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libfoo/1.0.0
        trace: collect_build_prerequisites: end libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (2): end {tix | tex->{tix/2,1}}
        trace: collect_build_postponed (1): end {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          upgrade libfoo/1.0.0
            config.libfoo.extras=true (set by tex)
          reconfigure/update tex/1.0.0 (required by tix)
            config.tex.extras=true (set by tix)
            config.tex.libfoo_extras=true (set by tex)
          reconfigure/update tix/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !tix configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured !1.0.0
        EOO

      $pkg_drop tix
    }

    : skip-existing-dependent-last
    :
    : Similar to the above but the skipped existing dependent is the last/only
    : dependent in the cluster.
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  tiz: depends: tex(c)
      #       depends: libbar(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      $* tiz ?libfoo/0.1.0 --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured !0.1.0 available 1.0.0
        EOO

      $* --upgrade --recursive 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: skip configured tiz/1.0.0
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libfoo/0.1.0: update to libfoo/1.0.0
        %.*
        trace: pkg_build: refine package collection/plan execution
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tex/1.0.0 due to dependency libfoo/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: skip configured tiz/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tex/1.0.0 due to dependency libfoo/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): cfg-negotiate end {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_postponed (2): begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent tex/1.0.0 involves (being) negotiated configurations and results in {tex^ | libbar->{tex/1,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tex^ | libbar->{tex/1,1}} failed due to dependent tex, refining configuration
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): cfg-negotiate end {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_postponed (2): begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
        trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libfoo/1.0.0
        trace: collect_build_prerequisites: end libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (2): end {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (1): end {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          upgrade libfoo/1.0.0
            config.libfoo.extras=true (set by tex)
          reconfigure/update tex/1.0.0 (required by tiz)
            config.tex.extras=true (set by tiz)
            config.tex.libfoo_extras=true (set by tex)
          reconfigure/update tiz/1.0.0
            config.tiz.tex_extras=true (set by tiz)
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured !1.0.0
        EOO

      $pkg_drop tiz
    }

    : skip-existing-dependent-cluster
    :
    : Similar to skip-existing-dependent but skip the existing dependent
    : because it is already in a cluster as a dependency.
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  bac: depends: libbar(c)
      #       depends: libbaz(c)
      #       depends: libfoo(c)
      #
      #  bas: depends: libbar(c)
      #       depends: bus(c)
      #
      #  bus: depends: libbaz(c)
      #       depends: foo(c)
      #
      #  foo: depends: libfoo(c)
      #
      #  box: depends: {libbar libfoo} (c) | libbox
      #
      $* bac bas 2>!;

      $pkg_status -r >>EOO;
        !bac configured 1.0.0
          libbar configured 1.0.0
          libbaz configured 1.0.0
          libfoo configured 1.0.0
        !bas configured 1.0.0
          bus configured 1.0.0
            foo configured 1.0.0
              libfoo configured 1.0.0
            libbaz configured 1.0.0
          libbar configured 1.0.0
        EOO

      $* box 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: begin box/1.0.0
        trace: collect_build_prerequisites: alt-postpone dependent box/1.0.0 since max index is reached: 0
          info: dependency alternative: {libbar libfoo}
        {
          require
          {
            config.libbar.extras = true
            config.libfoo.extras = true
          }
        }
        trace: collect_build_prerequisites: postpone box/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (0): index 1 collect alt-postponed box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent box/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent box/1.0.0
        trace: postponed_configurations::add: create {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: postpone box/1.0.0
        trace: collect_build_postponed (1): begin {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bac/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bac/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval bas/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bas/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval foo/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval bac/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bac/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build: add bac/1.0.0
        trace: collect_build_prerequisites: reeval bac/1.0.0
        trace: postponed_configurations::add: add {bac^ 1,1: libbar} to {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bac/1.0.0 results in {bac^ box | libbar->{bac/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated bac/1.0.0
        trace: collect_build: add bas/1.0.0
        trace: collect_build_prerequisites: reeval bas/1.0.0
        trace: postponed_configurations::add: add {bas^ 1,1: libbar} to {bac^ box | libbar->{bac/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bas/1.0.0 results in {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated bas/1.0.0
        trace: collect_build: add foo/1.0.0
        trace: collect_build_prerequisites: reeval foo/1.0.0
        trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {bac^ bas^ box foo^ | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1 foo/1,1}}
        trace: collect_build_prerequisites: re-evaluated foo/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bac^ bas^ box foo^ | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1 foo/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bac/1.0.0
        trace: collect_build_prerequisites: resume bac/1.0.0
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bac/1.0.0
        trace: postponed_configurations::add: create {bac | libbaz->{bac/2,1}}
        trace: collect_build_prerequisites: postpone bac/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build: add bus/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build_prerequisites: end box/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/1.0.0
        trace: collect_build_prerequisites: resume foo/1.0.0
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bac^ bas^ box foo^ | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1 foo/1,1}}!
        trace: collect_build_postponed (2): begin {bac | libbaz->{bac/2,1}}
        trace: collect_build_prerequisites: pre-reeval bus/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bus/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bac of dependency libbaz
        trace: collect_build_postponed (2): skip existing dependent bus of dependency libbaz since dependent already in cluster {bas | bus->{bas/2,1}} (as a dependency)
        trace: collect_build_postponed (2): cfg-negotiate begin {bac | libbaz->{bac/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbaz/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bac/1.0.0
        trace: collect_build_prerequisites: resume bac/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bac/1.0.0
        trace: postponed_configurations::add: add {bac 3,1: libfoo} to {bac^ bas^ box foo^ | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1 foo/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bac/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent bac/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bac/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bac | libbaz->{bac/2,1}}!
        trace: collect_build_postponed (3): begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent bas of dependency bus
        trace: collect_build_postponed (3): cfg-negotiate begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bus/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: add {bus 1,1: libbaz} to {bac | libbaz->{bac/2,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bus/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbaz/1.0.0 of dependent bus/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: cannot cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (foo), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: begin box/1.0.0
        trace: collect_build_prerequisites: alt-postpone dependent box/1.0.0 since max index is reached: 0
          info: dependency alternative: {libbar libfoo}
        {
          require
          {
            config.libbar.extras = true
            config.libfoo.extras = true
          }
        }
        trace: collect_build_prerequisites: postpone box/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (0): index 1 collect alt-postponed box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent box/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent box/1.0.0
        trace: postponed_configurations::add: create {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: postpone box/1.0.0
        trace: collect_build_postponed (1): begin {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bac/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bac/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval bas/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bas/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval foo/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval bac/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bac/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent foo of dependency libfoo
        trace: collect_build: add foo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build: add bac/1.0.0
        trace: collect_build_prerequisites: reeval bac/1.0.0
        trace: postponed_configurations::add: add {bac^ 1,1: libbar} to {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bac/1.0.0 results in {bac^ box | libbar->{bac/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated bac/1.0.0
        trace: collect_build: add bas/1.0.0
        trace: collect_build_prerequisites: reeval bas/1.0.0
        trace: postponed_configurations::add: add {bas^ 1,1: libbar} to {bac^ box | libbar->{bac/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bas/1.0.0 results in {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated bas/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bac/1.0.0
        trace: collect_build_prerequisites: resume bac/1.0.0
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bac/1.0.0
        trace: postponed_configurations::add: create {bac | libbaz->{bac/2,1}}
        trace: collect_build_prerequisites: postpone bac/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build: add bus/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build_prerequisites: end box/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bac | libbaz->{bac/2,1}}
        trace: collect_build_prerequisites: pre-reeval bus/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bus/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bac of dependency libbaz
        trace: collect_build_postponed (2): skip existing dependent bus of dependency libbaz since dependent already in cluster {bas | bus->{bas/2,1}} (as a dependency)
        trace: collect_build_postponed (2): cfg-negotiate begin {bac | libbaz->{bac/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbaz/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bac/1.0.0
        trace: collect_build_prerequisites: resume bac/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bac/1.0.0
        trace: postponed_configurations::add: add {bac 3,1: libfoo} to {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{box/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bac/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent bac/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bac/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bac | libbaz->{bac/2,1}}!
        trace: collect_build_postponed (3): begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent bas of dependency bus
        trace: collect_build_postponed (3): cfg-negotiate begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bus/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: add {bus 1,1: libbaz} to {bac | libbaz->{bac/2,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bus/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbaz/1.0.0 of dependent bus/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: create {bus | foo->{bus/2,1}}
        trace: collect_build_prerequisites: postpone bus/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: end bas/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {bas | bus->{bas/2,1}}!
        trace: collect_build_postponed (4): begin {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent bus of dependency foo
        trace: collect_build_postponed (4): cfg-negotiate begin {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin foo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
        trace: postponed_configurations::add: add {foo 1,1: libfoo} to {bac^ bas^ box | libbar->{bac/1,1 bas/1,1 box/1,1} libfoo->{bac/3,1 box/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent foo/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent foo/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent bus/1.0.0
        trace: collect_build_prerequisites: resume bus/1.0.0
        trace: collect_build_prerequisites: end bus/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {bus | foo->{bus/2,1}}!
        trace: collect_build_postponed (4): end {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (3): end {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (2): end {bac | libbaz->{bac/2,1}}
        trace: collect_build_postponed (1): end {box | libbar->{box/1,1} libfoo->{box/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          new box/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_drop bac bas box
    }

    : replace-configured-dependency
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  diz: depends: dox(c)
      #       depends: libbox(c)
      #       depends: libbar(c)
      #
      #  dox: depends: dex(c)
      #
      #  dex: depends: bar(c)
      #       depends: libfoo(c)
      #
      #  bar: depends: libbar(c)
      #
      $* diz libbar/0.1.0 ?libbox/0.1.0 --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !libbar configured !0.1.0 available 1.0.0
        !diz configured 1.0.0
          dox configured 1.0.0
            dex configured 1.0.0
              bar configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              libfoo configured 1.0.0
          !libbar configured !0.1.0 available 1.0.0
          libbox configured !0.1.0 available 1.0.0
        EOO

      cat cfg/libbox-0.1.0/build/config.build >>~%EOO%;
        %.*
        config.libbox.extras = true
        EOO

      $* --upgrade --recursive 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: postponed_configurations::add: add {bar^ 1,1: libbar} to {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bar/1.0.0 results in {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluated bar/1.0.0
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/1.0.0
        trace: collect_build_prerequisites: resume bar/1.0.0
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: add libbox/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (bar), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: add libbox/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
        trace: collect_build_prerequisites: resume dox/1.0.0
        trace: collect_build_prerequisites: end dox/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
        trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent diz of dependency libbox
        trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/0.1.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: add {diz 3,1: libbar} to {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent diz/1.0.0 involves (being) negotiated configurations and results in {bar^ diz | libbar->{bar/1,1 diz/3,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {bar^ | libbar->{bar/1,1}} failed due to dependent diz, refining configuration
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: add libbox/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
        trace: collect_build_prerequisites: resume dox/1.0.0
        trace: collect_build_prerequisites: end dox/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
        trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent diz of dependency libbox
        trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/0.1.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: add {diz 3,1: libbar} to {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent diz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent diz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end diz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {diz | libbox->{diz/2,1}}!
        trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (5): skip being built existing dependent dex of dependency bar
        trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
        trace: postponed_configurations::add: add {bar 1,1: libbar} to {bar^ diz | libbar->{bar/1,1 diz/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
        trace: collect_build_prerequisites: resume dex/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
        trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (6): skip being built existing dependent dex of dependency libfoo
        trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
        trace: collect_build_prerequisites: resume dex/1.0.0
        trace: collect_build_prerequisites: end dex/1.0.0
        trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
        trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (4): end {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (3): end {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (2): end {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (1): end {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libbox/0.1.0: update to libbox/1.0.0
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbox/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: postponed_configurations::add: add {bar^ 1,1: libbar} to {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bar/1.0.0 results in {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluated bar/1.0.0
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/1.0.0
        trace: collect_build_prerequisites: resume bar/1.0.0
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbox/1.0.0 over libbox/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (bar), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbox/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbox/1.0.0 over libbox/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
        trace: collect_build_prerequisites: resume dox/1.0.0
        trace: collect_build_prerequisites: end dox/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
        trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent diz of dependency libbox
        trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbox/1.0.0
        trace: collect_build_prerequisites: end libbox/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: add {diz 3,1: libbar} to {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent diz/1.0.0 involves (being) negotiated configurations and results in {bar^ diz | libbar->{bar/1,1 diz/3,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {bar^ | libbar->{bar/1,1}} failed due to dependent diz, refining configuration
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbox/1.0.0 over libbox/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
        trace: collect_build_prerequisites: resume dox/1.0.0
        trace: collect_build_prerequisites: end dox/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
        trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent diz of dependency libbox
        trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbox/1.0.0
        trace: collect_build_prerequisites: end libbox/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: add {diz 3,1: libbar} to {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent diz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent diz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end diz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {diz | libbox->{diz/2,1}}!
        trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (5): skip being built existing dependent dex of dependency bar
        trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
        trace: postponed_configurations::add: add {bar 1,1: libbar} to {bar^ diz | libbar->{bar/1,1 diz/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
        trace: collect_build_prerequisites: resume dex/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
        trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (6): skip being built existing dependent dex of dependency libfoo
        trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
        trace: collect_build_prerequisites: resume dex/1.0.0
        trace: collect_build_prerequisites: end dex/1.0.0
        trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
        trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (4): end {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (3): end {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (2): end {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (1): end {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          upgrade libbar/1.0.0
            config.libbar.extras=true (set by diz)
          reconfigure/update bar/1.0.0 (required by dex)
            config.bar.extras=true (set by dex)
          reconfigure/update dex/1.0.0 (required by dox)
            config.dex.extras=true (set by dox)
          reconfigure/update dox/1.0.0 (required by diz)
            config.dox.extras=true (set by diz)
          upgrade libbox/1.0.0
            config.libbox.extras=true (set by diz)
          reconfigure/update diz/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      cat cfg/libbox-1.0.0/build2/config.build2 >>~%EOO%;
        %.*
        config.libbox.extras = true
        EOO

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
        !diz configured 1.0.0
          dox configured 1.0.0
            dex configured 1.0.0
              bar configured 1.0.0
                !libbar configured 1.0.0
              libfoo configured 1.0.0
          !libbar configured 1.0.0
          libbox configured !1.0.0
        EOO

      $pkg_drop diz libbar --drop-dependent
    }

    : multiple-dependency-postpones
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  diz: depends: dox(c)
      #       depends: libbox(c)
      #       depends: libbar(c)
      #
      #  dox: depends: dex(c)
      #
      #  dex: depends: bar(c)
      #       depends: libfoo(c)
      #
      #  bar: depends: libbar(c)
      #
      $* diz dex libbar/0.1.0 --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !libbar configured !0.1.0 available 1.0.0
        !dex configured 1.0.0
          bar configured 1.0.0
            !libbar configured !0.1.0 available 1.0.0
          libfoo configured 1.0.0
        !diz configured 1.0.0
          dox configured 1.0.0
            !dex configured 1.0.0
              bar configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              libfoo configured 1.0.0
          !libbar configured !0.1.0 available 1.0.0
          libbox configured 1.0.0
        EOO

      $* --upgrade --recursive 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: skip configured dex/1.0.0
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: postponed_configurations::add: add {bar^ 1,1: libbar} to {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bar/1.0.0 results in {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluated bar/1.0.0
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/1.0.0
        trace: collect_build_prerequisites: resume bar/1.0.0
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (dex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: pkg_build: dep-postpone user-specified dex
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: postponed_configurations::add: add {bar^ 1,1: libbar} to {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bar/1.0.0 results in {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: re-evaluated bar/1.0.0
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bar/1.0.0
        trace: collect_build_prerequisites: resume bar/1.0.0
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (bar), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add dex/1.0.0
        trace: collect_build: add diz/1.0.0
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent bar/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add bar/1.0.0
        trace: postponed_configurations::add: create {bar^ | libbar->{bar/1,1}}
        trace: collect_build: add dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dox/1.0.0 of existing dependent diz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {diz^ | dox->{diz/1,1}}
        trace: pkg_build: dep-postpone user-specified dex
        trace: collect_build_prerequisites: skip configured diz/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
        trace: collect_build_prerequisites: resume dox/1.0.0
        trace: collect_build_prerequisites: end dox/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
        trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent diz of dependency libbox
        trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: add {diz 3,1: libbar} to {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent diz/1.0.0 involves (being) negotiated configurations and results in {bar^ diz | libbar->{bar/1,1 diz/3,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {bar^ | libbar->{bar/1,1}} failed due to dependent diz, refining configuration
        trace: collect_build_postponed (1): begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: pre-reeval bar/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bar/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval diz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated diz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar of dependency libbar
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bar^ | libbar->{bar/1,1}}
        trace: collect_build_prerequisites: reeval diz/1.0.0
        trace: postponed_configurations::add: add {diz^ 1,1: dox} to {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent diz/1.0.0 results in {diz^ | dox->{diz/1,1}}
        trace: collect_build_prerequisites: re-evaluated diz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bar
        trace: collect_build_postponed (1): cfg-negotiate end {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_postponed (2): begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent diz of dependency dox
        trace: collect_build_postponed (2): cfg-negotiate begin {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency dex/1.0.0 of dependent dox/1.0.0
        trace: postponed_configurations::add: create {dox | dex->{dox/1,1}}
        trace: collect_build_prerequisites: postpone dox/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: create {diz | libbox->{diz/2,1}}
        trace: collect_build_prerequisites: postpone diz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {diz^ | dox->{diz/1,1}}!
        trace: collect_build_postponed (3): begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent dox of dependency dex
        trace: collect_build_postponed (3): cfg-negotiate begin {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin dex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bar/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | bar->{dex/1,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent dox/1.0.0
        trace: collect_build_prerequisites: resume dox/1.0.0
        trace: collect_build_prerequisites: end dox/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {dox | dex->{dox/1,1}}!
        trace: collect_build_postponed (4): begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent diz of dependency libbox
        trace: collect_build_postponed (4): cfg-negotiate begin {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent diz/1.0.0
        trace: collect_build_prerequisites: resume diz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent diz/1.0.0
        trace: postponed_configurations::add: add {diz 3,1: libbar} to {bar^ | libbar->{bar/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent diz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent diz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end diz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {diz | libbox->{diz/2,1}}!
        trace: collect_build_postponed (5): begin {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (5): skip being built existing dependent dex of dependency bar
        trace: collect_build_postponed (5): cfg-negotiate begin {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bar/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bar/1.0.0
        trace: postponed_configurations::add: add {bar 1,1: libbar} to {bar^ diz | libbar->{bar/1,1 diz/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bar/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bar/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bar/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent dex/1.0.0
        trace: collect_build_prerequisites: resume dex/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent dex/1.0.0
        trace: postponed_configurations::add: create {dex | libfoo->{dex/2,1}}
        trace: collect_build_prerequisites: postpone dex/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {dex | bar->{dex/1,1}}!
        trace: collect_build_postponed (6): begin {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (6): skip being built existing dependent dex of dependency libfoo
        trace: collect_build_postponed (6): cfg-negotiate begin {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (6): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (6): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (6): select cfg-negotiated dependency alternative for dependent dex/1.0.0
        trace: collect_build_prerequisites: resume dex/1.0.0
        trace: collect_build_prerequisites: end dex/1.0.0
        trace: collect_build_postponed (6): cfg-negotiate end {dex | libfoo->{dex/2,1}}!
        trace: collect_build_postponed (6): end {dex | libfoo->{dex/2,1}}
        trace: collect_build_postponed (5): end {dex | bar->{dex/1,1}}
        trace: collect_build_postponed (4): end {diz | libbox->{diz/2,1}}
        trace: collect_build_postponed (3): end {dox | dex->{dox/1,1}}
        trace: collect_build_postponed (2): end {diz^ | dox->{diz/1,1}}
        trace: collect_build_postponed (1): end {bar^ | libbar->{bar/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          upgrade libbar/1.0.0
            config.libbar.extras=true (set by diz)
          reconfigure/update bar/1.0.0 (required by dex)
            config.bar.extras=true (set by dex)
          reconfigure/update dex/1.0.0
            config.dex.extras=true (set by dox)
          reconfigure/update dox/1.0.0 (required by diz)
            config.dox.extras=true (set by diz)
          reconfigure/update diz/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
        !dex configured 1.0.0
          bar configured 1.0.0
            !libbar configured 1.0.0
          libfoo configured 1.0.0
        !diz configured 1.0.0
          dox configured 1.0.0
            !dex configured 1.0.0
              bar configured 1.0.0
                !libbar configured 1.0.0
              libfoo configured 1.0.0
          !libbar configured 1.0.0
          libbox configured 1.0.0
        EOO

      $pkg_drop diz dex libbar --drop-dependent
    }

    : collected-dependency-non-negotiated-cluster
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  tiz: depends: tex(c)
      #       depends: libbar(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      $* tiz libbar/0.1.0 --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !libbar configured !0.1.0 available 1.0.0
        !tiz configured 1.0.0
          !libbar configured !0.1.0 available 1.0.0
          tex configured 1.0.0
            !libbar configured !0.1.0 available 1.0.0
            libfoo configured 1.0.0
        EOO

      $* --upgrade --recursive 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of existing dependent tex/1.0.0 due to dependency libbar/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of existing dependent tiz/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: skip configured tiz/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip existing dependent tex of dependency libbar since dependent already in cluster {tiz^ | tex->{tiz/1,1}} (as a dependency)
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: add {tiz^ 1,1: tex} to {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): cfg-negotiate end {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_postponed (2): begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent tex/1.0.0 involves (being) negotiated configurations and results in {tex^ | libbar->{tex/1,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tex^ | libbar->{tex/1,1}} failed due to dependent tex, refining configuration
        trace: collect_build_postponed (1): begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip existing dependent tex of dependency libbar since dependent already in cluster {tiz^ | tex->{tiz/1,1}} (as a dependency)
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: add {tiz^ 1,1: tex} to {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex
        trace: collect_build_postponed (1): cfg-negotiate end {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_postponed (2): begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex^ | libbar->{tex/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
        trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (2): end {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (1): end {tex^ | libbar->{tex/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          upgrade libbar/1.0.0
            config.libbar.extras=true (set by tex)
          reconfigure/update tex/1.0.0 (required by tiz)
            config.tex.extras=true (set by tiz)
            config.tex.libfoo_extras=true (set by tex)
          reconfigure/update tiz/1.0.0
            config.tiz.tex_extras=true (set by tiz)
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
        !tiz configured 1.0.0
          !libbar configured 1.0.0
          tex configured 1.0.0
            !libbar configured 1.0.0
            libfoo configured 1.0.0
        EOO

      $pkg_drop tiz libbar --drop-dependent
    }

    : from-scratch-refinement-drop
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  tiz: depends: tex(c)
      #       depends: libbar(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      #  toz: depends: libbaz(c)
      #       depends: libfoo(c)
      #       depends: libbar(c)
      #
      #  tez: depends: libbox(c)
      #       depends: toz == 0.1.0 (c)
      #       depends: libbar (c)
      #
      #  toz/0.1.0:
      #
      $* tiz toz --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        !toz configured 1.0.0
          libbar configured 1.0.0
          libbaz configured 1.0.0
          libfoo configured 1.0.0
        EOO

      $* tez 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbox/1.0.0
        trace: collect_build_prerequisites: end libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (3): begin {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (3): re-evaluate existing dependents for {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ tez | libbar->{tex/1,1 tez/3,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbox/1.0.0
        trace: collect_build_prerequisites: end libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (3): begin {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (3): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (3): re-evaluate existing dependents for {tez | libbar->{tez/3,1}}
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {tez | libbar->{tez/3,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build_prerequisites: end tez/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tez | libbar->{tez/3,1}}!
        trace: collect_build_postponed (4): begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (4): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (4): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tez | libbar->{tez/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex tez | libbar->{tex/1,1 tez/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
        trace: collect_build_postponed (5): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (5): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (5): skip being built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (5): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (5): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (4): end {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (3): end {tez | libbar->{tez/3,1}}
        trace: collect_build_postponed (2): end {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (1): end {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libbaz/1.0.0: unused
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_drop: add libbaz
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbox/1.0.0
        trace: collect_build_prerequisites: end libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (3): begin {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (3): re-evaluate existing dependents for {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ tez | libbar->{tex/1,1 tez/3,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_drop: add libbaz
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbox/1.0.0
        trace: collect_build_prerequisites: end libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (3): begin {tez | libbar->{tez/3,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (3): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (3): re-evaluate existing dependents for {tez | libbar->{tez/3,1}}
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {tez | libbar->{tez/3,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build_prerequisites: end tez/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tez | libbar->{tez/3,1}}!
        trace: collect_build_postponed (4): begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (4): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (4): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tez | libbar->{tez/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex tez | libbar->{tex/1,1 tez/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
        trace: collect_build_postponed (5): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (5): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (5): skip being built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (5): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (5): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (4): end {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_postponed (3): end {tez | libbar->{tez/3,1}}
        trace: collect_build_postponed (2): end {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (1): end {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          new libbox/1.0.0 (required by tez)
            config.libbox.extras=true (set by tez)
          drop libbaz/1.0.0 (unused)
          downgrade toz/0.1.0 (required by tez)
            config.toz.extras=true (set by tez)
          new tez/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        !toz configured 0.1.0 available 1.0.0 0.2.0
        !tez configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          !toz configured 0.1.0 available 1.0.0 0.2.0
        EOO

      $pkg_drop tiz toz tez
    }

    : from-scratch-refinement-upgrade
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  tiz: depends: tex(c)
      #       depends: libbar(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      #  tez: depends: libbox(c)
      #       depends: toz == 0.1.0 (c)
      #
      #  toz/0.1.0:
      #
      #  tuz: depends: toz (c)
      #
      #  tix: depends: libbar(c)
      #       depends: tex(c)
      #
      #  toz/1.0.0: depends: libbaz(c)
      #             depends: libfoo(c)
      #             depends: libbar(c)
      #
      $* tiz tez/0.1.0 tuz --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        !tez configured !0.1.0 available 1.0.0
          libbox configured 1.0.0
          toz configured 0.1.0 available 1.0.0 0.2.0
        !tuz configured 1.0.0
          toz configured 0.1.0 available 1.0.0 0.2.0
        EOO

      $* tix ?tez ?toz 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: begin tix/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ tix | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: begin tix/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: add {tix 2,1: tex} to {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
        trace: collect_build_postponed (2): begin {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix | libbar->{tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: end tix/1.0.0
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex tix | libbar->{tex/1,1 tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tix tiz^ | tex->{tix/2,1 tiz/1,1}}!
        trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (2): end {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (1): end {tix | libbar->{tix/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: tez/0.1.0: unused
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: begin tix/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_drop: overwrite tez
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ tix | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: begin tix/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_drop: overwrite tez
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: add {tix 2,1: tex} to {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
        trace: collect_build_postponed (2): begin {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (2): cfg-negotiate begin {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix | libbar->{tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: end tix/1.0.0
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex tix | libbar->{tex/1,1 tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tix tiz^ | tex->{tix/2,1 tiz/1,1}}!
        trace: collect_build_postponed (3): begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (3): cfg-negotiate begin {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tex | libfoo->{tex/2,1}}!
        trace: collect_build_postponed (3): end {tex | libfoo->{tex/2,1}}
        trace: collect_build_postponed (2): end {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (1): end {tix | libbar->{tix/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libbox/1.0.0: unused
        %.*
        trace: evaluate_dependency: toz/0.1.0: update to toz/1.0.0
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: begin tix/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_drop: overwrite tez
        trace: collect_drop: add libbox
        trace: collect_build_prerequisites: skip being dropped existing dependent tez of dependency toz
        trace: collect_build_prerequisites: pre-reeval tuz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tuz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency toz/1.0.0 of existing dependent tuz/1.0.0 due to dependency toz/1.0.0
        trace: collect_build: add tuz/1.0.0
        trace: postponed_configurations::add: create {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ tix | libbar->{tex/1,1 tix/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tix/1.0.0
        trace: collect_build_prerequisites: begin tix/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: create {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_drop: overwrite tez
        trace: collect_drop: add libbox
        trace: collect_build_prerequisites: skip being dropped existing dependent tez of dependency toz
        trace: collect_build_prerequisites: pre-reeval tuz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tuz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postpone dependency toz/1.0.0 of existing dependent tuz/1.0.0 due to dependency toz/1.0.0
        trace: collect_build: add tuz/1.0.0
        trace: postponed_configurations::add: create {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tix | libbar->{tix/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent tex of dependency libbar
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tix | libbar->{tix/1,1}}
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_prerequisites: reeval tiz/1.0.0
        trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tix | libbar->{tix/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tix/1.0.0
        trace: postponed_configurations::add: add {tix 2,1: tex} to {tiz^ | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tix/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tix | libbar->{tix/1,1}}!
        trace: collect_build_postponed (2): begin {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_postponed (2): skip being dropped existing dependent tez of dependency toz
        trace: collect_build_prerequisites: pre-reeval tuz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tuz/1.0.0: 1,1
        trace: collect_build_postponed (2): re-evaluate existing dependents for {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_prerequisites: reeval tuz/1.0.0
        trace: collect_build: pick toz/1.0.0 over toz/0.1.0
        trace: postponed_configurations::add: add {tuz^ 1,1: toz} to {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tuz/1.0.0 results in {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_prerequisites: re-evaluated tuz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/1.0.0
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent toz/1.0.0
        trace: postponed_configurations::add: create {toz | libbaz->{toz/1,1}}
        trace: collect_build_prerequisites: postpone toz/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tuz/1.0.0
        trace: collect_build_prerequisites: resume tuz/1.0.0
        trace: collect_build_prerequisites: end tuz/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tuz^ | toz->{tuz/1,1}}!
        trace: collect_build_postponed (3): begin {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (3): cfg-negotiate begin {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tix | libbar->{tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tix/1.0.0
        trace: collect_build_prerequisites: resume tix/1.0.0
        trace: collect_build_prerequisites: end tix/1.0.0
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {tex tix | libbar->{tex/1,1 tix/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tix tiz^ | tex->{tix/2,1 tiz/1,1}}!
        trace: collect_build_postponed (4): begin {toz | libbaz->{toz/1,1}}
        trace: collect_build_postponed (4): cfg-negotiate begin {toz | libbaz->{toz/1,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin libbaz/1.0.0
        trace: collect_build_prerequisites: end libbaz/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent toz/1.0.0
        trace: collect_build_prerequisites: resume toz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/1.0.0
        trace: postponed_configurations::add: add {toz 2,1: libfoo} to {tex | libfoo->{tex/2,1}}
        trace: collect_build_prerequisites: postpone toz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {toz | libbaz->{toz/1,1}}!
        trace: collect_build_postponed (5): begin {tex toz | libfoo->{tex/2,1 toz/2,1}}
        trace: collect_build_postponed (5): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (5): cfg-negotiate begin {tex toz | libfoo->{tex/2,1 toz/2,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent toz/1.0.0
        trace: collect_build_prerequisites: resume toz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/1.0.0
        trace: postponed_configurations::add: add {toz 3,1: libbar} to {tex tix tiz | libbar->{tex/1,1 tix/1,1 tiz/2,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent toz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent toz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end toz/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {tex toz | libfoo->{tex/2,1 toz/2,1}}!
        trace: collect_build_postponed (5): end {tex toz | libfoo->{tex/2,1 toz/2,1}}
        trace: collect_build_postponed (4): end {toz | libbaz->{toz/1,1}}
        trace: collect_build_postponed (3): end {tix tiz^ | tex->{tix/2,1 tiz/1,1}}
        trace: collect_build_postponed (2): end {tuz^ | toz->{tuz/1,1}}
        trace: collect_build_postponed (1): end {tix | libbar->{tix/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          drop libbox/1.0.0 (unused)
          new libbaz/1.0.0 (required by toz)
            config.libbaz.extras=true (set by toz)
          new tix/1.0.0
          upgrade toz/1.0.0
            config.toz.extras=true (set by tuz)
          drop tez/0.1.0 (unused)
          reconfigure tuz/1.0.0 (dependent of toz)
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        !tuz configured 1.0.0
          toz configured 1.0.0
            libbar configured 1.0.0
            libbaz configured 1.0.0
            libfoo configured 1.0.0
        !tix configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        EOO

      $pkg_drop tiz tuz tix
    }

    : reeval-cycle-resolution
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  bax: depends: libfoo(c)
      #       depends: {libbox libbar} (c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      #  box/0.1.0: depends: libbox(c)
      #
      $* bax tex --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !tex configured 1.0.0
          libbar configured 1.0.0
          libfoo configured 1.0.0
        EOO

      $* box/0.2.0 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: add box/0.2.0
        trace: collect_build_prerequisites: begin box/0.2.0
        %.*
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent box/0.2.0
        trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: postpone box/0.2.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        %.*
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        %.*
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        %.*
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        %.*
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        %.*
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        %.*
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: postponed_configurations::add: merge {tex^ | libbar->{tex/1,1}} into {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box tex^ | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box tex^ | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        %.*
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        %.*
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        %.*
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 involves negotiated configurations and results in {box tex^ | libbox->{box/1,1} libbar->{tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {box tex^ | libbox->{box/1,1} libbar->{tex/1,1}}!
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        %.*
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        %.*
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        %.*
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: merge configuration cycle detected for being re-evaluated dependent tex/1.0.0 since {box tex^ | libbox->{box/1,1} libbar->{tex/1,1}}! is a shadow of itself, throwing merge_configuration_cycle
        trace: collect_build_postponed (2): re-evaluation of existing dependent tex/1.0.0 failed due to merge configuration cycle for {bax^ | libfoo->{bax/1,1}}, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tex/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        %.*
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        %.*
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        %.*
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        %.*
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: postponed_configurations::add: merge {tex | libbar->{tex/1,1}} into {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box tex | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box tex | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        %.*
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        %.*
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        %.*
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        %.*
        trace: collect_build_prerequisites: cfg-postponing dependent tex/1.0.0 involves (being) negotiated configurations and results in {box tex | libbox->{box/1,1} libbar->{tex/1,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to dependent tex, refining configuration
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        %.*
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        %.*
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        %.*
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        %.*
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        %.*
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is shadow-negotiated
        trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        %.*
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 2,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): begin {bax^ tex | libfoo->{bax/1,1 tex/2,1}}
        %.*
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ tex | libfoo->{bax/1,1 tex/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        %.*
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box tex | libbox->{box/1,1} libbar->{tex/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tex/1.0.0
        trace: collect_build_prerequisites: resume tex/1.0.0
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bax^ tex | libfoo->{bax/1,1 tex/2,1}}!
        trace: collect_build_postponed (2): end {bax^ tex | libfoo->{bax/1,1 tex/2,1}}
        trace: collect_build_postponed (1): end {box | libbox->{box/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          new box/0.2.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !tex configured 1.0.0
          libbar configured 1.0.0
          libfoo configured 1.0.0
        !box configured !0.2.0 available 1.0.0
          libbox configured 1.0.0
        EOO

      $pkg_drop bax tex box
    }

    : up-negotiate-not-collected-existing-dependents
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  bax: depends: libfoo(c)
      #       depends: {libbox libbar} (c)
      #
      #  tiz: depends: tex(c)
      #       depends: libbar(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      #  box/0.1.0: depends: libbox(c)
      #
      $* bax tiz --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        EOO

      $* box/0.2.0 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add box/0.2.0
        trace: collect_build_prerequisites: begin box/0.2.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent box/0.2.0
        trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: postpone box/0.2.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: postponed_configurations::add: merge {tex^ | libbar->{tex/1,1}} into {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box tex^ | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box tex^ | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 involves negotiated configurations and results in {box tex^ | libbox->{box/1,1} libbar->{tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {box tex^ | libbox->{box/1,1} libbar->{tex/1,1}}!
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: merge configuration cycle detected for being re-evaluated dependent tex/1.0.0 since {box tex^ | libbox->{box/1,1} libbar->{tex/1,1}}! is a shadow of itself, throwing merge_configuration_cycle
        trace: collect_build_postponed (2): re-evaluation of existing dependent tex/1.0.0 failed due to merge configuration cycle for {bax^ | libfoo->{bax/1,1}}, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tex/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: postponed_configurations::add: merge {tex | libbar->{tex/1,1}} into {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box tex | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box tex | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {box | libbox->{box/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postponing dependent tex/1.0.0 adds not (being) collected dependencies libbar/1.0.0 with not (being) collected existing dependents to (being) negotiated cluster and results in {box tex | libbox->{box/1,1} libbar->{tex/1,1}}!, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tiz/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_prerequisites: begin tiz/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add box/0.2.0
        trace: collect_build_prerequisites: begin box/0.2.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent box/0.2.0
        trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: postpone box/0.2.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip dep-postponed existing dependent tex of dependency libfoo
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 adds not (being) collected dependencies libbar/1.0.0 with not (being) collected existing dependents to (being) negotiated cluster and results in {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tex/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tiz/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_prerequisites: begin tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: create {tiz | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tiz/1.0.0
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent tiz of dependency libbar
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {box | libbox->{box/1,1}} failed due to dependent bax, refining configuration
        trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {box | libbox->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.2.0
        trace: collect_build_prerequisites: resume box/0.2.0
        trace: collect_build_prerequisites: end box/0.2.0
        trace: collect_build_postponed (1): cfg-negotiate end {box | libbox->{box/1,1}}!
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_prerequisites: begin tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: create {tiz | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tiz/1.0.0
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent tiz of dependency libbar
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bax^ | libfoo->{bax/1,1}}!
        trace: collect_build_postponed (2): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (3): begin {tiz | tex->{tiz/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (3): cfg-negotiate begin {tiz | tex->{tiz/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 2,1: libfoo} to {bax^ | libfoo->{bax/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {bax box tex | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tiz | tex->{tiz/1,1}}!
        trace: collect_build_postponed (3): end {tiz | tex->{tiz/1,1}}
        trace: collect_build_postponed (2): end {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (1): end {box | libbox->{box/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          new box/0.2.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        !box configured !0.2.0 available 1.0.0
          libbox configured 1.0.0
        EOO

      $pkg_drop bax tiz box
    }

    : up-negotiate-not-collected-existing-dependents2
    :
    : Similar to the above but more complicated.
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  bax: depends: libfoo(c)
      #       depends: {libbox libbar} (c)
      #
      #  tiz: depends: tex(c)
      #       depends: libbar(c)
      #
      #  tex: depends: libbar(c)
      #       depends: libfoo(c)
      #
      #  tez: depends: libbox(c)
      #       depends: toz == 0.1.0 (c)
      #       depends: libbar(c)
      #
      #  tvz: depends: toz == 0.2.0 (c)
      #
      #  toz/0.1.0:
      #
      $* bax tiz --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        EOO

      $* tez 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: re-evaluated tex/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: postponed_configurations::add: merge {tex^ | libbar->{tex/1,1}} into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax tex^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax tex^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tez | libbox->{tez/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 involves negotiated configurations and results in {tex^ tez | libbox->{tez/1,1} libbar->{tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {tex^ tez | libbox->{tez/1,1} libbar->{tex/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add tex/1.0.0
        trace: collect_build_prerequisites: reeval tex/1.0.0
        trace: postponed_configurations::add: add {tex^ 1,1: libbar} to {tez | libbox->{tez/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: merge configuration cycle detected for being re-evaluated dependent tex/1.0.0 since {tex^ tez | libbox->{tez/1,1} libbar->{tex/1,1}}! is a shadow of itself, throwing merge_configuration_cycle
        trace: collect_build_postponed (2): re-evaluation of existing dependent tex/1.0.0 failed due to merge configuration cycle for {bax^ | libfoo->{bax/1,1}}, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tex/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: postponed_configurations::add: merge {tex | libbar->{tex/1,1}} into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax tex tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax tex tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {tez | libbox->{tez/1,1}}! (shadow cluster-based)
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postponing dependent tex/1.0.0 adds not (being) collected dependencies libbar/1.0.0 with not (being) collected existing dependents to (being) negotiated cluster and results in {tex tez | libbox->{tez/1,1} libbar->{tex/1,1}}!, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tiz/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: create {tex | libbar->{tex/1,1}}
        trace: collect_build_prerequisites: postpone tex/1.0.0
        trace: collect_build_prerequisites: begin tiz/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip dep-postponed existing dependent tex of dependency libfoo
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: collect_build_prerequisites: pre-reeval tex/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 adds not (being) collected dependencies libbar/1.0.0 with not (being) collected existing dependents to (being) negotiated cluster and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!, throwing recollect_existing_dependents
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to some existing dependents related problem, scheduling their re-collection
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tex/1.0.0
        trace: collect_build: add tex/1.0.0
        trace: collect_build_postponed (0): schedule re-collection of existing dependent tiz/1.0.0
        trace: collect_build: add tiz/1.0.0
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_prerequisites: begin tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: create {tiz | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tiz/1.0.0
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent tiz of dependency libbar
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!, throwing retry_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to dependent bax, refining configuration
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_prerequisites: begin tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency tex/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: create {tiz | tex->{tiz/1,1}}
        trace: collect_build_prerequisites: postpone tiz/1.0.0
        trace: collect_build_postponed (1): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): skip being built existing dependent tex of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent tex of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: skip being built existing dependent tiz of dependency libbar
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: collecting cfg-postponed dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bax^ | libfoo->{bax/1,1}}!
        trace: collect_build_postponed (2): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (3): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (3): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: add {tez 3,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tez/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (3): skip re-collection of dep-postponed package tex
        trace: collect_build_postponed (4): begin {tiz | tex->{tiz/1,1}}
        trace: collect_build_postponed (4): skip being built existing dependent tiz of dependency tex
        trace: collect_build_postponed (4): cfg-negotiate begin {tiz | tex->{tiz/1,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin tex/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 1,1: libbar} to {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
        trace: postponed_configurations::add: add {tex 2,1: libfoo} to {bax^ | libfoo->{bax/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tex/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
        trace: collect_build_prerequisites: resume tiz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
        trace: postponed_configurations::add: add {tiz 2,1: libbar} to {bax tex tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1 tez/3,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tiz/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {tiz | tex->{tiz/1,1}}!
        trace: collect_build_postponed (4): end {tiz | tex->{tiz/1,1}}
        trace: collect_build_postponed (3): end {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): end {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (1): end {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          new toz/0.1.0 (required by tez)
            config.toz.extras=true (set by tez)
          new tez/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !tiz configured 1.0.0
          libbar configured 1.0.0
          tex configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
        !tez configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          toz configured 0.1.0 available 1.0.0 0.2.0
        EOO

     # While at it make sure that we won't be able to build tvz since it
     # requires toz of the 0.2.0 version, which initially can't be
     # satisfied. But this get automatically resolved by the unsatisfied
     # constraints resolution machinery.
     #
     $* tvz 2>&1 != 0 | $filter 2>>~%EOE%;
       %.*
       trace: pkg_build: refine package collection/plan execution from scratch
       trace: collect_build: add tvz/1.0.0
       trace: collect_build_prerequisites: begin tvz/1.0.0
       trace: collect_build: add toz/0.2.0
       info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
       trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/1.0.0
       trace: collect_build_postponed (0): begin
       trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): skip unsatisfied existing dependent tez of dependency toz/0.2.0 due to constraint (toz == 0.1.0)
       trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin toz/0.2.0
       trace: collect_build: add libfoo/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
       trace: collect_build_prerequisites: resume tvz/1.0.0
       trace: collect_build_prerequisites: end tvz/1.0.0
       trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
       trace: collect_build_postponed (2): begin {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval bax/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
       trace: collect_build: add libbar/1.0.0
       trace: collect_build_postponed (2): re-evaluate existing dependents for {toz | libfoo->{toz/1,1}}
       trace: collect_build: add bax/1.0.0
       trace: collect_build_prerequisites: reeval bax/1.0.0
       trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_prerequisites: re-evaluated bax/1.0.0
       trace: collect_build: add tex/1.0.0
       trace: collect_build_prerequisites: reeval tex/1.0.0
       trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: re-evaluated tex/1.0.0
       trace: collect_build_postponed (2): cfg-negotiate begin {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libfoo/1.0.0
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build: add libbox/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
       trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: postpone bax/1.0.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tex^ | libbar->{bax/2,1 tex/1,1} libbox->{bax/2,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (2): cfg-negotiate end {bax^ toz | libfoo->{bax/1,1 toz/1,1}}!
       trace: collect_build_postponed (3): begin {bax tex^ toz | libbar->{bax/2,1 tex/1,1 toz/2,1} libbox->{bax/2,1}}
       trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libbar
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbar
       trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval tez/1.0.0
       trace: collect_build_prerequisites: re-evaluation of dependent tez/1.0.0 deviated for depends clause 2: now cannot select alternative, previously 1 was selected
       trace: collect_build_postponed (3): schedule re-collection of deviated existing dependent tez/1.0.0
       trace: collect_build: add tez/1.0.0
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbox
       trace: collect_build_postponed (3): skip being built existing dependent tez of dependency libbox
       trace: collect_build_postponed (3): re-evaluate existing dependents for {bax tex^ toz | libbar->{bax/2,1 tex/1,1 toz/2,1} libbox->{bax/2,1}}
       trace: collect_build: add tiz/1.0.0
       trace: collect_build_prerequisites: reeval tiz/1.0.0
       trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
       trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
       trace: pkg_build: refine package collection/plan execution from scratch
       trace: collect_build: add tvz/1.0.0
       trace: collect_build_prerequisites: begin tvz/1.0.0
       trace: collect_build: add toz/0.2.0
       info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
       trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/1.0.0
       trace: collect_build_postponed (0): begin
       trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): skip unsatisfied existing dependent tez of dependency toz/0.2.0 due to constraint (toz == 0.1.0)
       trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin toz/0.2.0
       trace: collect_build: add libfoo/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
       trace: collect_build_prerequisites: resume tvz/1.0.0
       trace: collect_build_prerequisites: end tvz/1.0.0
       trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
       trace: collect_build_postponed (2): begin {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval bax/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
       trace: collect_build_postponed (2): skip dep-postponed existing dependent tex of dependency libfoo
       trace: collect_build: add tex/1.0.0
       trace: collect_build_postponed (2): re-evaluate existing dependents for {toz | libfoo->{toz/1,1}}
       trace: collect_build: add bax/1.0.0
       trace: collect_build_prerequisites: reeval bax/1.0.0
       trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_prerequisites: re-evaluated bax/1.0.0
       trace: collect_build_postponed (2): cfg-negotiate begin {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libfoo/1.0.0
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build: add libbox/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
       trace: collect_build: add libbar/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
       trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
       trace: collect_build_prerequisites: postpone bax/1.0.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (2): cfg-negotiate end {bax^ toz | libfoo->{bax/1,1 toz/1,1}}!
       trace: collect_build_postponed (3): begin {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbox
       trace: collect_build_prerequisites: pre-reeval tez/1.0.0
       trace: collect_build_prerequisites: re-evaluation of dependent tez/1.0.0 deviated for depends clause 2: now cannot select alternative, previously 1 was selected
       trace: collect_build_postponed (3): schedule re-collection of deviated existing dependent tez/1.0.0
       trace: collect_build: add tez/1.0.0
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbar
       trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
       trace: collect_build_postponed (3): skip being built existing dependent tez of dependency libbar
       trace: collect_build_postponed (3): skip dep-postponed existing dependent tex of dependency libbar
       trace: collect_build_postponed (3): re-evaluate existing dependents for {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build: add tiz/1.0.0
       trace: collect_build_prerequisites: reeval tiz/1.0.0
       trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
       trace: collect_build_postponed (3): cfg-negotiate begin {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libbox/1.0.0
       trace: collect_build_prerequisites: skip configured libbar/1.0.0
       trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build_prerequisites: end bax/1.0.0
       trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: end toz/0.2.0
       trace: collect_build_postponed (3): cfg-negotiate end {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: begin tez/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 1,1: libbox} to {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
       trace: collect_build: pick toz/0.2.0 over toz/0.1.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 3,1: libbar} to {bax tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tez/1.0.0
       trace: collect_build_postponed (4): begin {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (4): skip being built existing dependent tiz of dependency tex
       trace: collect_build_postponed (4): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin tex/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
       trace: postponed_configurations::add: add {tex 1,1: libbar} to {bax tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
       trace: postponed_configurations::add: add {tex 2,1: libfoo} to {bax^ toz | libfoo->{bax/1,1 toz/1,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tex/1.0.0
       trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
       trace: collect_build_prerequisites: resume tiz/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
       trace: postponed_configurations::add: add {tiz 2,1: libbar} to {bax tex tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1 tez/3,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tiz/1.0.0
       trace: collect_build_postponed (4): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
       trace: collect_build_postponed (4): end {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (3): end {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (2): end {toz | libfoo->{toz/1,1}}
       trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (0): end
       trace: execute_plan: simulate: yes
       %.*
       trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
       trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
       trace: try_replace_dependent: try to replace conflicting dependent tvz/1.0.0 of dependency toz/0.2.0 with some other version
       trace: try_replace_dependency: replace conflicting dependent version tvz/1.0.0 with 0.1.0 by adding constraint 'tvz' -> 'tvz == 0.1.0' on command line
       trace: pkg_build: refine package collection/plan execution from scratch
       trace: collect_build: add tvz/0.1.0
       trace: collect_build_prerequisites: begin tvz/0.1.0
       trace: collect_build: add toz/0.2.0
       info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
       trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/0.1.0
       trace: collect_build_postponed (0): begin
       trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): skip unsatisfied existing dependent tez of dependency toz/0.2.0 due to constraint (toz == 0.1.0)
       trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin toz/0.2.0
       trace: collect_build: add libfoo/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
       trace: collect_build_prerequisites: resume tvz/0.1.0
       trace: collect_build: add bax/1.0.0
       trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
       trace: collect_build_prerequisites: skip configured bax/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
       trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/0.1.0
       trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
       trace: collect_build_postponed (2): begin {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval bax/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
       trace: collect_build: add libbar/1.0.0
       trace: collect_build_postponed (2): re-evaluate existing dependents for {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: reeval bax/1.0.0
       trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: re-evaluated bax/1.0.0
       trace: collect_build: add tex/1.0.0
       trace: collect_build_prerequisites: reeval tex/1.0.0
       trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: re-evaluated tex/1.0.0
       trace: collect_build_postponed (2): cfg-negotiate begin {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libfoo/1.0.0
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build: add libbox/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
       trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: postpone bax/1.0.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tex^ | libbar->{bax/2,1 tex/1,1} libbox->{bax/2,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
       trace: collect_build_prerequisites: resume tvz/0.1.0
       trace: collect_build_prerequisites: end tvz/0.1.0
       trace: collect_build_postponed (2): cfg-negotiate end {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
       trace: collect_build_postponed (3): begin {bax tex^ toz | libbar->{bax/2,1 tex/1,1 toz/2,1} libbox->{bax/2,1}}
       trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libbar
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbar
       trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval tez/1.0.0
       trace: collect_build_prerequisites: re-evaluation of dependent tez/1.0.0 deviated for depends clause 2: now cannot select alternative, previously 1 was selected
       trace: collect_build_postponed (3): schedule re-collection of deviated existing dependent tez/1.0.0
       trace: collect_build: add tez/1.0.0
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbox
       trace: collect_build_postponed (3): skip being built existing dependent tez of dependency libbox
       trace: collect_build_postponed (3): re-evaluate existing dependents for {bax tex^ toz | libbar->{bax/2,1 tex/1,1 toz/2,1} libbox->{bax/2,1}}
       trace: collect_build: add tiz/1.0.0
       trace: collect_build_prerequisites: reeval tiz/1.0.0
       trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
       trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
       trace: pkg_build: refine package collection/plan execution from scratch
       trace: collect_build: add tvz/0.1.0
       trace: collect_build_prerequisites: begin tvz/0.1.0
       trace: collect_build: add toz/0.2.0
       info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/0.1.0
       trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/0.1.0
       trace: collect_build_postponed (0): begin
       trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): skip unsatisfied existing dependent tez of dependency toz/0.2.0 due to constraint (toz == 0.1.0)
       trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin toz/0.2.0
       trace: collect_build: add libfoo/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
       trace: collect_build_prerequisites: resume tvz/0.1.0
       trace: collect_build: add bax/1.0.0
       trace: collect_build_prerequisites: no cfg-clause for dependency bax/1.0.0 of dependent tvz/0.1.0
       trace: collect_build_prerequisites: skip configured bax/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tvz/0.1.0
       trace: postponed_configurations::add: add {tvz 3,1: libfoo} to {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/0.1.0
       trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
       trace: collect_build_postponed (2): begin {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval bax/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
       trace: collect_build_postponed (2): skip dep-postponed existing dependent tex of dependency libfoo
       trace: collect_build: add tex/1.0.0
       trace: collect_build_postponed (2): re-evaluate existing dependents for {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: reeval bax/1.0.0
       trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
       trace: collect_build_prerequisites: re-evaluated bax/1.0.0
       trace: collect_build_postponed (2): cfg-negotiate begin {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libfoo/1.0.0
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build: add libbox/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
       trace: collect_build: add libbar/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
       trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
       trace: collect_build_prerequisites: postpone bax/1.0.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tvz/0.1.0
       trace: collect_build_prerequisites: resume tvz/0.1.0
       trace: collect_build_prerequisites: end tvz/0.1.0
       trace: collect_build_postponed (2): cfg-negotiate end {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
       trace: collect_build_postponed (3): begin {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbox
       trace: collect_build_prerequisites: pre-reeval tez/1.0.0
       trace: collect_build_prerequisites: re-evaluation of dependent tez/1.0.0 deviated for depends clause 2: now cannot select alternative, previously 1 was selected
       trace: collect_build_postponed (3): schedule re-collection of deviated existing dependent tez/1.0.0
       trace: collect_build: add tez/1.0.0
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbar
       trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
       trace: collect_build_postponed (3): skip being built existing dependent tez of dependency libbar
       trace: collect_build_postponed (3): skip dep-postponed existing dependent tex of dependency libbar
       trace: collect_build_postponed (3): re-evaluate existing dependents for {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build: add tiz/1.0.0
       trace: collect_build_prerequisites: reeval tiz/1.0.0
       trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
       trace: collect_build_postponed (3): cfg-negotiate begin {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libbox/1.0.0
       trace: collect_build_prerequisites: skip configured libbar/1.0.0
       trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build_prerequisites: end bax/1.0.0
       trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: end toz/0.2.0
       trace: collect_build_postponed (3): cfg-negotiate end {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: begin tez/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 1,1: libbox} to {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
       trace: collect_build: pick toz/0.2.0 over toz/0.1.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 3,1: libbar} to {bax tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tez/1.0.0
       trace: collect_build_postponed (4): begin {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (4): skip being built existing dependent tiz of dependency tex
       trace: collect_build_postponed (4): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin tex/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
       trace: postponed_configurations::add: add {tex 1,1: libbar} to {bax tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
       trace: postponed_configurations::add: add {tex 2,1: libfoo} to {bax^ toz tvz | libfoo->{bax/1,1 toz/1,1 tvz/3,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tex/1.0.0
       trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
       trace: collect_build_prerequisites: resume tiz/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
       trace: postponed_configurations::add: add {tiz 2,1: libbar} to {bax tex tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1 tez/3,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tiz/1.0.0
       trace: collect_build_postponed (4): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
       trace: collect_build_postponed (4): end {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (3): end {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (2): end {toz tvz | libfoo->{toz/1,1 tvz/3,1}}
       trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (0): end
       trace: execute_plan: simulate: yes
       %.*
       trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
       trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
       trace: try_replace_dependent: try to replace conflicting dependent tvz/0.1.0 of dependency toz/0.2.0 with some other version
       trace: try_replace_dependency: replacement of conflicting dependent version tvz/0.1.0 is denied since it is specified on command line as 'tvz == 0.1.0'
       trace: pkg_build: cannot replace any package, rolling back latest command line adjustment ('tvz' -> 'tvz == 0.1.0')
       trace: pkg_build: refine package collection/plan execution from scratch
       trace: collect_build: add tvz/1.0.0
       trace: collect_build_prerequisites: begin tvz/1.0.0
       trace: collect_build: add toz/0.2.0
       info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
       trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/1.0.0
       trace: collect_build_postponed (0): begin
       trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): skip unsatisfied existing dependent tez of dependency toz/0.2.0 due to constraint (toz == 0.1.0)
       trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin toz/0.2.0
       trace: collect_build: add libfoo/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
       trace: collect_build_prerequisites: resume tvz/1.0.0
       trace: collect_build_prerequisites: end tvz/1.0.0
       trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
       trace: collect_build_postponed (2): begin {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval bax/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
       trace: collect_build: add libbar/1.0.0
       trace: collect_build_postponed (2): re-evaluate existing dependents for {toz | libfoo->{toz/1,1}}
       trace: collect_build: add bax/1.0.0
       trace: collect_build_prerequisites: reeval bax/1.0.0
       trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_prerequisites: re-evaluated bax/1.0.0
       trace: collect_build: add tex/1.0.0
       trace: collect_build_prerequisites: reeval tex/1.0.0
       trace: postponed_configurations::add: create {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent tex/1.0.0 results in {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: re-evaluated tex/1.0.0
       trace: collect_build_postponed (2): cfg-negotiate begin {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libfoo/1.0.0
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build: add libbox/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
       trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tex^ | libbar->{tex/1,1}}
       trace: collect_build_prerequisites: postpone bax/1.0.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax tex^ | libbar->{bax/2,1 tex/1,1} libbox->{bax/2,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (2): cfg-negotiate end {bax^ toz | libfoo->{bax/1,1 toz/1,1}}!
       trace: collect_build_postponed (3): begin {bax tex^ toz | libbar->{bax/2,1 tex/1,1 toz/2,1} libbox->{bax/2,1}}
       trace: collect_build_postponed (3): skip being built existing dependent tex of dependency libbar
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbar
       trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval tez/1.0.0
       trace: collect_build_prerequisites: re-evaluation of dependent tez/1.0.0 deviated for depends clause 2: now cannot select alternative, previously 1 was selected
       trace: collect_build_postponed (3): schedule re-collection of deviated existing dependent tez/1.0.0
       trace: collect_build: add tez/1.0.0
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbox
       trace: collect_build_postponed (3): skip being built existing dependent tez of dependency libbox
       trace: collect_build_postponed (3): re-evaluate existing dependents for {bax tex^ toz | libbar->{bax/2,1 tex/1,1 toz/2,1} libbox->{bax/2,1}}
       trace: collect_build: add tiz/1.0.0
       trace: collect_build_prerequisites: reeval tiz/1.0.0
       trace: collect_build_prerequisites: cannot re-evaluate existing dependent tiz/1.0.0 due to dependency tex/1.0.0 (collected prematurely), throwing postpone_dependency
       trace: pkg_build: collection failed due to prematurely collected dependency (tex), retry from scratch
       trace: pkg_build: refine package collection/plan execution from scratch
       trace: collect_build: add tvz/1.0.0
       trace: collect_build_prerequisites: begin tvz/1.0.0
       trace: collect_build: add toz/0.2.0
       info: package tvz dependency on (toz == 0.2.0) is forcing upgrade of toz/0.1.0 to 0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tvz/1.0.0
       trace: postponed_configurations::add: create {tvz | toz->{tvz/1,1}}
       trace: collect_build_prerequisites: postpone tvz/1.0.0
       trace: collect_build_postponed (0): begin
       trace: collect_build_postponed (1): begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): skip unsatisfied existing dependent tez of dependency toz/0.2.0 due to constraint (toz == 0.1.0)
       trace: collect_build_postponed (1): cfg-negotiate begin {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin toz/0.2.0
       trace: collect_build: add libfoo/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: create {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tvz/1.0.0
       trace: collect_build_prerequisites: resume tvz/1.0.0
       trace: collect_build_prerequisites: end tvz/1.0.0
       trace: collect_build_postponed (1): cfg-negotiate end {tvz | toz->{tvz/1,1}}!
       trace: collect_build_postponed (2): begin {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_prerequisites: pre-reeval bax/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
       trace: collect_build_postponed (2): skip dep-postponed existing dependent tex of dependency libfoo
       trace: collect_build: add tex/1.0.0
       trace: collect_build_postponed (2): re-evaluate existing dependents for {toz | libfoo->{toz/1,1}}
       trace: collect_build: add bax/1.0.0
       trace: collect_build_prerequisites: reeval bax/1.0.0
       trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {toz | libfoo->{toz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_prerequisites: re-evaluated bax/1.0.0
       trace: collect_build_postponed (2): cfg-negotiate begin {bax^ toz | libfoo->{bax/1,1 toz/1,1}}
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libfoo/1.0.0
       trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build: add libbox/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
       trace: collect_build: add libbar/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
       trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
       trace: collect_build_prerequisites: postpone bax/1.0.0
       trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent toz/0.2.0
       trace: postponed_configurations::add: add {toz 2,1: libbar} to {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
       trace: collect_build_prerequisites: postpone toz/0.2.0
       trace: collect_build_postponed (2): cfg-negotiate end {bax^ toz | libfoo->{bax/1,1 toz/1,1}}!
       trace: collect_build_postponed (3): begin {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbox
       trace: collect_build_prerequisites: pre-reeval tez/1.0.0
       trace: collect_build_prerequisites: re-evaluation of dependent tez/1.0.0 deviated for depends clause 2: now cannot select alternative, previously 1 was selected
       trace: collect_build_postponed (3): schedule re-collection of deviated existing dependent tez/1.0.0
       trace: collect_build: add tez/1.0.0
       trace: collect_build_prerequisites: pre-reeval tex/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tex/1.0.0: 1,1
       trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libbar
       trace: collect_build_prerequisites: pre-reeval tiz/1.0.0
       trace: collect_build_prerequisites: pre-reevaluated tiz/1.0.0: 1,1
       trace: collect_build_postponed (3): skip being built existing dependent tez of dependency libbar
       trace: collect_build_postponed (3): skip dep-postponed existing dependent tex of dependency libbar
       trace: collect_build_postponed (3): re-evaluate existing dependents for {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build: add tiz/1.0.0
       trace: collect_build_prerequisites: reeval tiz/1.0.0
       trace: postponed_configurations::add: create {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_prerequisites: re-evaluating dependent tiz/1.0.0 results in {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_prerequisites: re-evaluated tiz/1.0.0
       trace: collect_build_postponed (3): cfg-negotiate begin {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: skip configured libbox/1.0.0
       trace: collect_build_prerequisites: skip configured libbar/1.0.0
       trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
       trace: collect_build_prerequisites: resume bax/1.0.0
       trace: collect_build_prerequisites: end bax/1.0.0
       trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent toz/0.2.0
       trace: collect_build_prerequisites: resume toz/0.2.0
       trace: collect_build_prerequisites: end toz/0.2.0
       trace: collect_build_postponed (3): cfg-negotiate end {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: begin tez/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 1,1: libbox} to {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build: postpone failure for dependent tez unsatisfied with dependency toz/0.2.0 (== 0.1.0)
       trace: collect_build: pick toz/0.2.0 over toz/0.1.0
       trace: collect_build_prerequisites: cfg-postpone dependency toz/0.2.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 2,1: toz} to {tvz | toz->{tvz/1,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency toz/0.2.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
       trace: postponed_configurations::add: add {tez 3,1: libbar} to {bax tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tez/1.0.0
       trace: collect_build_postponed (4): begin {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (4): skip being built existing dependent tiz of dependency tex
       trace: collect_build_postponed (4): cfg-negotiate begin {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
       trace: collect_build_prerequisites: begin tex/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tex/1.0.0
       trace: postponed_configurations::add: add {tex 1,1: libbar} to {bax tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tez/3,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent tex/1.0.0
       trace: postponed_configurations::add: add {tex 2,1: libfoo} to {bax^ toz | libfoo->{bax/1,1 toz/1,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tex/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent tex/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tex/1.0.0
       trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
       trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent tiz/1.0.0
       trace: collect_build_prerequisites: resume tiz/1.0.0
       trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tiz/1.0.0
       trace: postponed_configurations::add: add {tiz 2,1: libbar} to {bax tex tez toz | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 tex/1,1 tez/3,1 toz/2,1}}!
       trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tiz/1.0.0 is negotiated
       trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tiz/1.0.0 is already (being) recursively collected, skipping
       trace: collect_build_prerequisites: end tiz/1.0.0
       trace: collect_build_postponed (4): cfg-negotiate end {tiz^ | tex->{tiz/1,1}}!
       trace: collect_build_postponed (4): end {tiz^ | tex->{tiz/1,1}}
       trace: collect_build_postponed (3): end {bax toz | libbox->{bax/2,1} libbar->{bax/2,1 toz/2,1}}
       trace: collect_build_postponed (2): end {toz | libfoo->{toz/1,1}}
       trace: collect_build_postponed (1): end {tvz | toz->{tvz/1,1}}
       trace: collect_build_postponed (0): end
       trace: execute_plan: simulate: yes
       %.*
       trace: pkg_build: try to replace unsatisfactory dependency toz/0.2.0 with some other version
       trace: try_replace_dependent: try to replace unsatisfied dependent tez/1.0.0 of dependency toz/0.2.0 with some other version
       trace: try_replace_dependent: try to replace conflicting dependent tvz/1.0.0 of dependency toz/0.2.0 with some other version
       trace: try_replace_dependency: replacement tvz/0.1.0 tried earlier for same command line, skipping
       error: unable to satisfy constraints on package toz
         info: tvz/1.0.0 depends on (toz == 0.2.0)
         info: tez/1.0.0 depends on (toz == 0.1.0)
         info: available toz/0.2.0
         info: available toz/0.1.0
         info: while satisfying tez/1.0.0
         info: explicitly specify toz version to manually satisfy both constraints
       %.*
       EOE

      $pkg_drop bax tiz tez
    }

    : merge-config-version-replacement
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  box: depends: {libbar libfoo} (c) | libbox
      #
      #  bax: depends: libfoo(c)
      #       depends: {libbox libbar} (c)
      #
      #  toz: depends: libbaz(c)
      #       depends: libfoo(c)
      #       depends: libbar(c)
      #
      #  tez: depends: libbox(c)
      #       depends: toz == 0.1.0 (c)
      #       depends: libbar(c)
      #
      #  toz/0.1.0:
      #
      $* box bax toz --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !box configured 1.0.0
          libbar configured 1.0.0
          libfoo configured 1.0.0
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !toz configured 1.0.0
          libbar configured 1.0.0
          libbaz configured 1.0.0
          libfoo configured 1.0.0
        EOO

      $* tez 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build_postponed (2): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: postponed_configurations::add: merge {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {tez | libbox->{tez/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_prerequisites: pre-reeval toz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated toz/1.0.0: 1,1
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build: add toz/1.0.0
        trace: collect_build_prerequisites: reeval toz/1.0.0
        trace: postponed_configurations::add: create {toz^ | libbaz->{toz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent toz/1.0.0 results in {toz^ | libbaz->{toz/1,1}}
        trace: collect_build_prerequisites: re-evaluated toz/1.0.0
        trace: collect_build_postponed (1): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (1): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (1): cfg-negotiate begin {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? (shadow cluster-based)
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build_prerequisites: end box/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: pick toz/0.1.0 over toz/1.0.0
        trace: collect_build: toz/1.0.0 package version needs to be replaced with toz/0.1.0
        trace: pkg_build: collection failed due to package version replacement, retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: apply version replacement for toz/0.1.0
        trace: collect_build: replacement: toz/0.1.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build_postponed (2): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: postponed_configurations::add: merge {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {tez | libbox->{tez/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (1): skip expected to be built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build_postponed (1): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (1): skip expected to be built existing dependent toz of dependency libbar
        trace: collect_build_postponed (1): cfg-negotiate begin {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? (shadow cluster-based)
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build_prerequisites: end box/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: apply version replacement for toz/0.1.0
        trace: collect_build: replacement: toz/0.1.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bax^ box^ tez | libbox->{bax/2,1 tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{bax/2,1 box/1,1}}!
        trace: collect_build_postponed (2): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: add {tez 3,1: libbar} to {bax^ box^ tez | libbox->{bax/2,1 tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{bax/2,1 box/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tez/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (2): end {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (1): end {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libbaz/1.0.0: unused
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_drop: add libbaz
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build_postponed (2): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: postponed_configurations::add: merge {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {tez | libbox->{tez/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_prerequisites: pre-reeval toz/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated toz/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build: add toz/1.0.0
        trace: collect_build_prerequisites: reeval toz/1.0.0
        trace: postponed_configurations::add: create {toz^ | libbaz->{toz/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent toz/1.0.0 results in {toz^ | libbaz->{toz/1,1}}
        trace: collect_build_prerequisites: re-evaluated toz/1.0.0
        trace: collect_build_postponed (1): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (1): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (1): cfg-negotiate begin {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? (shadow cluster-based)
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build_prerequisites: end box/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: pick toz/0.1.0 over toz/1.0.0
        trace: collect_build: toz/1.0.0 package version needs to be replaced with toz/0.1.0
        trace: pkg_build: collection failed due to package version replacement, retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add tez/1.0.0
        trace: collect_build_prerequisites: begin tez/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_drop: add libbaz
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: apply version replacement for toz/0.1.0
        trace: collect_build: replacement: toz/0.1.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {tez | libbox->{tez/1,1}}!
        trace: collect_build_postponed (2): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build_postponed (2): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (2): skip being built existing dependent toz of dependency libbar
        trace: collect_build_postponed (2): cfg-negotiate begin {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {tez | libbox->{tez/1,1}}!
        trace: postponed_configurations::add: merge {bax^ box^ | libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? into {bax tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1}}!
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 merges non-negotiated and/or being negotiated configurations in and results in {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!, throwing merge_configuration
        trace: collect_build_postponed (0): cfg-negotiation of {tez | libbox->{tez/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax box^ tez | libbox->{bax/2,1 tez/1,1} libbar->{bax/2,1 box/1,1} libfoo->{bax/1,1 box/1,1}}!
        trace: collect_build_postponed (1): begin {tez | libbox->{tez/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (1): re-evaluate existing dependents for {tez | libbox->{tez/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {tez | libbox->{tez/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_prerequisites: pre-reeval box/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated box/1.0.0: 1,1
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (1): skip expected to be built existing dependent toz of dependency libfoo
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}}
        trace: collect_build: add box/1.0.0
        trace: collect_build_prerequisites: reeval box/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: postponed_configurations::add: add {box^ 1,1: libbar libfoo} to {bax^ tez | libbox->{tez/1,1} libfoo->{bax/1,1}} (shadow cluster-based)
        trace: collect_build_prerequisites: re-evaluating dependent box/1.0.0 results in {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_prerequisites: re-evaluated box/1.0.0
        trace: collect_build_postponed (1): skip being built existing dependent box of dependency libbar
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (1): skip expected to be built existing dependent toz of dependency libbar
        trace: collect_build_postponed (1): cfg-negotiate begin {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ box^ tez | libbox->{tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{box/1,1}}? (shadow cluster-based)
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is shadow-negotiated
        trace: collect_build_prerequisites: dependency libbox/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/1.0.0
        trace: collect_build_prerequisites: resume box/1.0.0
        trace: collect_build_prerequisites: end box/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build: apply version replacement for toz/0.1.0
        trace: collect_build: replacement: toz/0.1.0
        trace: collect_build: add toz/0.1.0
        warning: package tez dependency on (toz == 0.1.0) is forcing downgrade of toz/1.0.0 to 0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency toz/0.1.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: create {tez | toz->{tez/2,1}}
        trace: collect_build_prerequisites: postpone tez/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bax^ box^ tez | libbox->{bax/2,1 tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{bax/2,1 box/1,1}}!
        trace: collect_build_postponed (2): begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): cfg-negotiate begin {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin toz/0.1.0
        trace: collect_build_prerequisites: end toz/0.1.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tez/1.0.0
        trace: collect_build_prerequisites: resume tez/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent tez/1.0.0
        trace: postponed_configurations::add: add {tez 3,1: libbar} to {bax^ box^ tez | libbox->{bax/2,1 tez/1,1} libfoo->{bax/1,1 box/1,1} libbar->{bax/2,1 box/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent tez/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent tez/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end tez/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {tez | toz->{tez/2,1}}!
        trace: collect_build_postponed (2): end {tez | toz->{tez/2,1}}
        trace: collect_build_postponed (1): end {tez | libbox->{tez/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          drop libbaz/1.0.0 (unused)
          downgrade toz/0.1.0 (required by tez)
            config.toz.extras=true (set by tez)
          new tez/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !box configured 1.0.0
          libbar configured 1.0.0
          libfoo configured 1.0.0
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !toz configured 0.1.0 available 1.0.0 0.2.0
        !tez configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          !toz configured 0.1.0 available 1.0.0 0.2.0
        EOO

      $pkg_drop box bax toz tez
    }

    : recollect-dependent-bogus-dependency-postponement
    :
    {
      $clone_cfg;

      #  Dependencies:
      #
      #  bax: depends: libfoo(c)
      #       depends: {libbox libbar} (c)
      #
      #  bas: depends: libbar(c)
      #       depends: bus(c)
      #
      #  bus: depends: libbaz(c)
      #       depends: foo(c)
      #
      #  foo: depends: libfoo(c)
      #
      #  bat: depends: libbaz(c)
      #
      $* bax bas --verbose 1 2>!;

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !bas configured 1.0.0
          bus configured 1.0.0
            foo configured 1.0.0
              libfoo configured 1.0.0
            libbaz configured 1.0.0
          libbar configured 1.0.0
        EOO

      $* bat 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add bat/1.0.0
        trace: collect_build_prerequisites: begin bat/1.0.0
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
        trace: postponed_configurations::add: create {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: postpone bat/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: pre-reeval bus/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bus/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bat | libbaz->{bat/1,1}}
        trace: collect_build: add bus/1.0.0
        trace: collect_build_prerequisites: reeval bus/1.0.0
        trace: postponed_configurations::add: add {bus^ 1,1: libbaz} to {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bus/1.0.0 results in {bat bus^ | libbaz->{bat/1,1 bus/1,1}}
        trace: collect_build_prerequisites: re-evaluated bus/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bat bus^ | libbaz->{bat/1,1 bus/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbaz/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bat/1.0.0
        trace: collect_build_prerequisites: resume bat/1.0.0
        trace: collect_build_prerequisites: end bat/1.0.0
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bus/1.0.0
        trace: collect_build_prerequisites: resume bus/1.0.0
        trace: collect_build: add foo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: create {bus | foo->{bus/2,1}}
        trace: collect_build_prerequisites: postpone bus/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bat bus^ | libbaz->{bat/1,1 bus/1,1}}!
        trace: collect_build_postponed (2): begin {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (2): skip being built existing dependent bus of dependency foo
        trace: collect_build_postponed (2): cfg-negotiate begin {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin foo/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
        trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
        trace: collect_build_prerequisites: postpone foo/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bus/1.0.0
        trace: collect_build_prerequisites: resume bus/1.0.0
        trace: collect_build_prerequisites: end bus/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bus | foo->{bus/2,1}}!
        trace: collect_build_postponed (3): begin {foo | libfoo->{foo/1,1}}
        trace: collect_build_postponed (3): skip being built existing dependent foo of dependency libfoo
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (3): re-evaluate existing dependents for {foo | libfoo->{foo/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {foo | libfoo->{foo/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ foo | libfoo->{bax/1,1 foo/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {bax^ foo | libfoo->{bax/1,1 foo/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_prerequisites: postpone bax/1.0.0
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent foo/1.0.0
        trace: collect_build_prerequisites: resume foo/1.0.0
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {bax^ foo | libfoo->{bax/1,1 foo/1,1}}!
        trace: collect_build_postponed (4): begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent bax of dependency libbox
        trace: collect_build_postponed (4): skip being built existing dependent bax of dependency libbar
        trace: collect_build_prerequisites: pre-reeval bas/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bas/1.0.0: 1,1
        trace: collect_build_postponed (4): re-evaluate existing dependents for {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build: add bas/1.0.0
        trace: collect_build_prerequisites: reeval bas/1.0.0
        trace: postponed_configurations::add: add {bas^ 1,1: libbar} to {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bas/1.0.0 results in {bas^ bax | libbox->{bax/2,1} libbar->{bas/1,1 bax/2,1}}
        trace: collect_build_prerequisites: re-evaluated bas/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate begin {bas^ bax | libbox->{bax/2,1} libbar->{bas/1,1 bax/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (bus), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add bat/1.0.0
        trace: collect_build_prerequisites: begin bat/1.0.0
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
        trace: postponed_configurations::add: create {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: postpone bat/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: pre-reeval bus/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bus/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bus of dependency libbaz
        trace: collect_build: add bus/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bat | libbaz->{bat/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbaz/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bat/1.0.0
        trace: collect_build_prerequisites: resume bat/1.0.0
        trace: collect_build_prerequisites: end bat/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bat | libbaz->{bat/1,1}}!
        trace: collect_build_prerequisites: pre-reeval bas/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bas/1.0.0: 1,1
        trace: collect_build_postponed (1): schedule re-collection of existing dependent bas/1.0.0 due to bogus postponement of dependency bus
        trace: collect_build: add bas/1.0.0
        trace: collect_build_prerequisites: begin bas/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | libbar->{bas/1,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (2): begin {bas | libbar->{bas/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bas of dependency libbar
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bas | libbar->{bas/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bas | libbar->{bas/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bas | libbar->{bas/1,1}}!
        trace: collect_build_postponed (3): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval foo/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (3): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add foo/1.0.0
        trace: collect_build_prerequisites: reeval foo/1.0.0
        trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {bax^ foo^ | libfoo->{bax/1,1 foo/1,1}}
        trace: collect_build_prerequisites: re-evaluated foo/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {bax^ foo^ | libfoo->{bax/1,1 foo/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bas | libbar->{bas/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bas bax | libbar->{bas/1,1 bax/2,1} libbox->{bax/2,1}}!, throwing retry_configuration
        trace: collect_build_postponed (1): cfg-negotiation of {bas | libbar->{bas/1,1}} failed due to dependent bax, refining configuration
        trace: collect_build_postponed (2): begin {bas | libbar->{bas/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bas of dependency libbar
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bas | libbar->{bas/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bas | libbar->{bas/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bas | libbar->{bas/1,1}}!
        trace: collect_build_postponed (3): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval foo/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (3): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build: add foo/1.0.0
        trace: collect_build_prerequisites: reeval foo/1.0.0
        trace: postponed_configurations::add: add {foo^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent foo/1.0.0 results in {bax^ foo^ | libfoo->{bax/1,1 foo/1,1}}
        trace: collect_build_prerequisites: re-evaluated foo/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {bax^ foo^ | libfoo->{bax/1,1 foo/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bas | libbar->{bas/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
        trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent foo/1.0.0
        trace: collect_build_prerequisites: resume foo/1.0.0
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {bax^ foo^ | libfoo->{bax/1,1 foo/1,1}}!
        trace: collect_build_postponed (4): begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent bas of dependency bus
        trace: collect_build_postponed (4): cfg-negotiate begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bus/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: add {bus 1,1: libbaz} to {bat | libbaz->{bat/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bus/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbaz/1.0.0 of dependent bus/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: cannot cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (foo), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add bat/1.0.0
        trace: collect_build_prerequisites: begin bat/1.0.0
        trace: collect_build: add libbaz/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bat/1.0.0
        trace: postponed_configurations::add: create {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: postpone bat/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bat | libbaz->{bat/1,1}}
        trace: collect_build_prerequisites: pre-reeval bus/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bus/1.0.0: 1,1
        trace: collect_build_postponed (1): skip dep-postponed existing dependent bus of dependency libbaz
        trace: collect_build: add bus/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bat | libbaz->{bat/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbaz/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bat/1.0.0
        trace: collect_build_prerequisites: resume bat/1.0.0
        trace: collect_build_prerequisites: end bat/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bat | libbaz->{bat/1,1}}!
        trace: collect_build_prerequisites: pre-reeval bas/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bas/1.0.0: 1,1
        trace: collect_build_postponed (1): schedule re-collection of existing dependent bas/1.0.0 due to bogus postponement of dependency bus
        trace: collect_build: add bas/1.0.0
        trace: collect_build_prerequisites: begin bas/1.0.0
        trace: collect_build: add libbar/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | libbar->{bas/1,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (2): begin {bas | libbar->{bas/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bas of dependency libbar
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bas | libbar->{bas/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bas | libbar->{bas/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bas | libbar->{bas/1,1}}!
        trace: collect_build_postponed (3): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval foo/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (3): skip dep-postponed existing dependent foo of dependency libfoo
        trace: collect_build: add foo/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bas | libbar->{bas/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
        trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves (being) negotiated configurations and results in {bas bax | libbar->{bas/1,1 bax/2,1} libbox->{bax/2,1}}!, throwing retry_configuration
        trace: collect_build_postponed (1): cfg-negotiation of {bas | libbar->{bas/1,1}} failed due to dependent bax, refining configuration
        trace: collect_build_postponed (2): begin {bas | libbar->{bas/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (2): skip being built existing dependent bas of dependency libbar
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_postponed (2): re-evaluate existing dependents for {bas | libbar->{bas/1,1}}
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate begin {bas | libbar->{bas/1,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency bus/1.0.0 of dependent bas/1.0.0
        trace: postponed_configurations::add: create {bas | bus->{bas/2,1}}
        trace: collect_build_prerequisites: postpone bas/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bas | libbar->{bas/1,1}}!
        trace: collect_build_postponed (3): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval foo/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated foo/1.0.0: 1,1
        trace: collect_build_postponed (3): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (3): skip dep-postponed existing dependent foo of dependency libfoo
        trace: collect_build: add foo/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (3): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (3): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bas | libbar->{bas/1,1}}!
        trace: collect_build_prerequisites: skip being built existing dependent bax of dependency libbox
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
        trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (3): cfg-negotiate end {bax^ | libfoo->{bax/1,1}}!
        trace: collect_build_postponed (4): begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (4): skip being built existing dependent bas of dependency bus
        trace: collect_build_postponed (4): cfg-negotiate begin {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin bus/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbaz/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: add {bus 1,1: libbaz} to {bat | libbaz->{bat/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bus/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libbaz/1.0.0 of dependent bus/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: cfg-postpone dependency foo/1.0.0 of dependent bus/1.0.0
        trace: postponed_configurations::add: create {bus | foo->{bus/2,1}}
        trace: collect_build_prerequisites: postpone bus/1.0.0
        trace: collect_build_postponed (4): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (4): select cfg-negotiated dependency alternative for dependent bas/1.0.0
        trace: collect_build_prerequisites: resume bas/1.0.0
        trace: collect_build_prerequisites: end bas/1.0.0
        trace: collect_build_postponed (4): cfg-negotiate end {bas | bus->{bas/2,1}}!
        trace: collect_build_postponed (5): begin {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (5): skip being built existing dependent bus of dependency foo
        trace: collect_build_postponed (5): cfg-negotiate begin {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: begin foo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/1.0.0
        trace: postponed_configurations::add: add {foo 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}!
        trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent foo/1.0.0 is negotiated
        trace: collect_build_prerequisites: dependency libfoo/1.0.0 of dependent foo/1.0.0 is already (being) recursively collected, skipping
        trace: collect_build_prerequisites: end foo/1.0.0
        trace: collect_build_postponed (5): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (5): select cfg-negotiated dependency alternative for dependent bus/1.0.0
        trace: collect_build_prerequisites: resume bus/1.0.0
        trace: collect_build_prerequisites: end bus/1.0.0
        trace: collect_build_postponed (5): cfg-negotiate end {bus | foo->{bus/2,1}}!
        trace: collect_build_postponed (5): end {bus | foo->{bus/2,1}}
        trace: collect_build_postponed (4): end {bas | bus->{bas/2,1}}
        trace: collect_build_postponed (3): end {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (2): end {bas | libbar->{bas/1,1}}
        trace: collect_build_postponed (1): end {bat | libbaz->{bat/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          new bat/1.0.0
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !bax configured 1.0.0
          libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        !bas configured 1.0.0
          bus configured 1.0.0
            foo configured 1.0.0
              libfoo configured 1.0.0
            libbaz configured 1.0.0
          libbar configured 1.0.0
        !bat configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $pkg_drop bax bas bat
    }

    : recollect-pruned-collection
    :
    {
      $clone_cfg;

      $* libbar/0.1.0 libbiz/0.1.0 bax 2>!;

      $pkg_status -r >>EOO;
        !libbar configured !0.1.0 available 1.0.0
        !libbiz configured !0.1.0 available 1.0.0
        !bax configured 1.0.0
          !libbar configured !0.1.0 available 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        EOO

      $* --upgrade --immediate 2>&1 | $filter 2>>~%EOE%;
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add libbiz/1.0.0
        trace: collect_build: add bax/1.0.0
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0 due to dependency libbar/1.0.0
        trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: begin libbiz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: no cfg-clause for dependency libbar/1.0.0 of dependent libbiz/1.0.0
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_prerequisites: end libbiz/1.0.0
        trace: collect_build_prerequisites: skip configured bax/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: reeval bax/1.0.0
        trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: re-evaluated bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cannot cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0 (collected prematurely), throwing postpone_dependency
        trace: pkg_build: collection failed due to prematurely collected dependency (libbar), retry from scratch
        trace: pkg_build: refine package collection/plan execution from scratch
        trace: collect_build: add libbar/1.0.0
        trace: collect_build: add libbiz/1.0.0
        trace: collect_build: add bax/1.0.0
        trace: pkg_build: dep-postpone user-specified libbar
        trace: collect_build_prerequisites: begin libbiz/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: dep-postpone dependency libbar/1.0.0 of dependent libbiz/1.0.0
        trace: collect_build_prerequisites: end libbiz/1.0.0
        trace: collect_build_prerequisites: skip configured bax/1.0.0
        trace: collect_build_postponed (0): begin
        trace: collect_build_prerequisites: pre-reeval bax/1.0.0
        trace: collect_build_prerequisites: pre-reevaluated bax/1.0.0: 1,1
        trace: collect_build_postponed (0): schedule re-collection of existing dependent bax/1.0.0 due to bogus postponement of dependency libbar
        trace: collect_build_prerequisites: begin bax/1.0.0
        trace: collect_build: add libfoo/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: create {bax | libfoo->{bax/1,1}}
        trace: collect_build_prerequisites: postpone bax/1.0.0
        trace: collect_build_postponed (1): begin {bax | libfoo->{bax/1,1}}
        trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libfoo
        trace: collect_build_postponed (1): cfg-negotiate begin {bax | libfoo->{bax/1,1}}
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libfoo/1.0.0
        trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build: add libbox/1.0.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbox/1.0.0 of dependent bax/1.0.0
        trace: collect_build: pick libbar/1.0.0 over libbar/0.1.0
        trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
        trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_prerequisites: postpone bax/1.0.0
        trace: collect_build_postponed (1): cfg-negotiate end {bax | libfoo->{bax/1,1}}!
        trace: collect_build_postponed (2): begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbox
        trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
        trace: collect_build_postponed (2): cfg-negotiate begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
        trace: collect_build_prerequisites: skip configured libbox/1.0.0
        trace: collect_build_prerequisites: begin libbar/1.0.0
        trace: collect_build_prerequisites: end libbar/1.0.0
        trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
        trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
        trace: collect_build_prerequisites: resume bax/1.0.0
        trace: collect_build_prerequisites: end bax/1.0.0
        trace: collect_build_postponed (2): cfg-negotiate end {bax | libbox->{bax/2,1} libbar->{bax/2,1}}!
        trace: collect_build_postponed (2): end {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
        trace: collect_build_postponed (1): end {bax | libfoo->{bax/1,1}}
        trace: collect_build_postponed (0): end
        trace: execute_plan: simulate: yes
        %.*
        build plan:
          upgrade libbar/1.0.0
            config.libbar.extras=true (set by bax)
          upgrade libbiz/1.0.0
          reconfigure/update bax/1.0.0
            config.bax.libfoo_extras=true (set by bax)
        trace: execute_plan: simulate: no
        %.*
        EOE

      $pkg_status -r >>EOO;
        !libbar configured 1.0.0
        !libbiz configured 1.0.0
          !libbar configured 1.0.0
        !bax configured 1.0.0
          !libbar configured 1.0.0
          libbox configured 1.0.0
          libfoo configured 1.0.0
        EOO

      $pkg_drop libbar libbiz bax
    }

    : optimization
    :
    {
      +$clone_cfg

      : dependency-after-config-clause
      :
      {
        $clone_cfg;

        $* tax ?libfoo/0.1.0 2>!;

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libbar configured 1.0.0
            libfoo configured !0.1.0 available 1.0.0
          EOO

        $* ?libfoo 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libfoo/0.1.0: update to libfoo/1.0.0
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval tax/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated tax/1.0.0: 1,1 re-evaluation is optional
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            upgrade libfoo/1.0.0
            reconfigure tax (dependent of libfoo)
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop tax
      }

      : dependency-before-config-clause
      :
      {
        $clone_cfg;

        $* tex/0.2.0 ?libbar/0.1.0 2>!;

        $pkg_status -r >>EOO;
          !tex configured !0.2.0 available 1.0.0 0.3.0
            libbar configured !0.1.0 available 1.0.0
            libfoo configured 1.0.0
          EOO

        $* ?libbar 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: execute_plan: simulate: yes
          trace: evaluate_dependency: libbar/0.1.0: update to libbar/1.0.0
          trace: pkg_build: refine package collection/plan execution
          trace: collect_build_prerequisites: pre-reeval tex/0.2.0
          trace: collect_build_prerequisites: pre-reevaluated tex/0.2.0: 2,1 re-evaluation is optional
          trace: collect_build_prerequisites: begin libbar/1.0.0
          trace: collect_build_prerequisites: end libbar/1.0.0
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            upgrade libbar/1.0.0
            reconfigure tex (dependent of libbar)
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !tex configured !0.2.0 available 1.0.0 0.3.0
            libbar configured 1.0.0
            libfoo configured 1.0.0
          EOO

        $pkg_drop tex
      }

      : other-config-clause
      :
      {
        $clone_cfg;

        $* tax ?libfoo/0.1.0 2>!;

        $pkg_status -r >>EOO;
          !tax configured 1.0.0
            libbar configured 1.0.0
            libfoo configured !0.1.0 available 1.0.0
          EOO

        $* libfoo foo/0.1.0 2>&1 | $filter 2>>~%EOE%;
          %.*
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build: add foo/0.1.0
          trace: collect_build_prerequisites: pre-reeval tax/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated tax/1.0.0: 1,1 re-evaluation is optional
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_prerequisites: begin foo/0.1.0
          trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
          trace: collect_build_prerequisites: cannot cfg-postpone dependency libfoo/1.0.0 of dependent foo/0.1.0 (collected prematurely), throwing postpone_dependency
          trace: pkg_build: collection failed due to prematurely collected dependency (libfoo), retry from scratch
          trace: pkg_build: refine package collection/plan execution from scratch
          trace: collect_build: add libfoo/1.0.0
          trace: collect_build: add foo/0.1.0
          trace: pkg_build: dep-postpone user-specified libfoo
          trace: collect_build_prerequisites: begin foo/0.1.0
          trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
          trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of dependent foo/0.1.0
          trace: postponed_configurations::add: create {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: postpone foo/0.1.0
          trace: collect_build_postponed (0): begin
          trace: collect_build_postponed (1): begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_prerequisites: pre-reeval tax/1.0.0
          trace: collect_build_prerequisites: pre-reevaluated tax/1.0.0: 1,1 re-evaluation is optional
          trace: collect_build: add libbar/1.0.0
          trace: collect_build_postponed (1): re-evaluate existing dependents for {foo | libfoo->{foo/1,1}}
          trace: collect_build: add tax/1.0.0
          trace: collect_build_prerequisites: reeval tax/1.0.0
          trace: postponed_configurations::add: create {tax^ | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: re-evaluating dependent tax/1.0.0 results in {tax^ | libbar->{tax/1,1}}
          trace: collect_build_prerequisites: re-evaluated tax/1.0.0
          trace: collect_build_postponed (1): cfg-negotiate begin {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: begin libfoo/1.0.0
          trace: collect_build_prerequisites: end libfoo/1.0.0
          trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent foo/0.1.0
          trace: collect_build_prerequisites: resume foo/0.1.0
          trace: collect_build_prerequisites: end foo/0.1.0
          trace: collect_build_postponed (1): cfg-negotiate end {foo | libfoo->{foo/1,1}}!
          trace: collect_build_postponed (2): begin {tax^ | libbar->{tax/1,1}}
          trace: collect_build_postponed (2): skip being built existing dependent tax of dependency libbar
          trace: collect_build_postponed (2): cfg-negotiate begin {tax^ | libbar->{tax/1,1}}
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
          trace: collect_build_prerequisites: skip configured libbar/1.0.0
          trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
          trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent tax/1.0.0
          trace: collect_build_prerequisites: resume tax/1.0.0
          trace: collect_build: pick libfoo/1.0.0 over libfoo/0.1.0
          trace: collect_build_prerequisites: dep-postpone dependency libfoo/1.0.0 of dependent tax/1.0.0
          trace: collect_build_prerequisites: end tax/1.0.0
          trace: collect_build_postponed (2): cfg-negotiate end {tax^ | libbar->{tax/1,1}}!
          trace: collect_build_postponed (2): end {tax^ | libbar->{tax/1,1}}
          trace: collect_build_postponed (1): end {foo | libfoo->{foo/1,1}}
          trace: collect_build_postponed (0): end
          trace: execute_plan: simulate: yes
          %.*
          build plan:
            upgrade libfoo/1.0.0
              config.libfoo.extras=true (set by foo)
            reconfigure tax/1.0.0 (dependent of libfoo)
            new foo/0.1.0
          trace: execute_plan: simulate: no
          %.*
          EOE

        $pkg_status -r >>EOO;
          !libfoo configured 1.0.0
          !tax configured 1.0.0
            libbar configured 1.0.0
            !libfoo configured 1.0.0
          !foo configured !0.1.0 available 1.0.0 0.2.0
            !libfoo configured 1.0.0
          EOO

        $pkg_drop tax foo libfoo
      }
    }

    : repo-packages
    :
    : Don't match the tracing but just make sure that pkg-build doesn't crash
    : or hang and ends up with an expected packages setup.
    :
    {
      +$clone_cfg

      # Note that we don't mach the configuration negotiation flows in the
      # tests of this scope.
      #
      test.arguments += --verbose 1

      # Convert specific warnings to infos since we expect them to
      # appear. This, in particular, prevents bbot workers to set task result
      # status to warning.
      #
      warn_to_info = [cmdline] sed -e 's/warning: (package .* is forcing .*)/info: \1/' >&2

      : new-all
      :
      {
        $clone_cfg;

        $* libfoo libbar ?libbaz/0.1.0 ?libbox/0.1.0 libbiz \
           foo fox fux fix fex bar baz bac bat bas bus \
           box bax bux bix bex boo biz buz buc tax tex \
           tix tiz toz tez tuz tux dex dix diz dox 2>!;

        $pkg_status -r >>EOO;
          !libfoo configured 1.0.0
          !libbar configured 1.0.0
          !bat configured 1.0.0
            libbaz configured !0.1.0 available 1.0.0
          !tix configured 0.1.0 available 1.0.0
          !toz configured 0.1.0 available 1.0.0 0.2.0
          !tuz configured 1.0.0
            !toz configured 0.1.0 available 1.0.0 0.2.0
          !tux configured 1.0.0
            libbox configured !0.1.0 available 1.0.0
            !tix configured 0.1.0 available 1.0.0
          !libbiz configured 1.0.0
            !libbar configured 1.0.0
          !bar configured 1.0.0
            !libbar configured 1.0.0
          !bux configured 1.0.0
            !libbar configured 1.0.0
          !bex configured 1.0.0
            !libbar configured 1.0.0
          !boo configured 1.0.0
            !libbar configured 1.0.0
          !biz configured 1.0.0
            !boo configured 1.0.0
              !libbar configured 1.0.0
          !buz configured 1.0.0
            !bux configured 1.0.0
              !libbar configured 1.0.0
          !tez configured 1.0.0
            !libbar configured 1.0.0
            libbox configured !0.1.0 available 1.0.0
            !toz configured 0.1.0 available 1.0.0 0.2.0
          !bix configured 1.0.0
            !bar configured 1.0.0
              !libbar configured 1.0.0
            !bux configured 1.0.0
              !libbar configured 1.0.0
            !libbar configured 1.0.0
          !foo configured 1.0.0
            !libfoo configured 1.0.0
          !fox configured 1.0.0
            !libfoo configured 1.0.0
          !fux configured 1.0.0
            !libfoo configured 1.0.0
          !baz configured 1.0.0
            !libbar configured 1.0.0
            !libfoo configured 1.0.0
          !bac configured 1.0.0
            !libbar configured 1.0.0
            libbaz configured !0.1.0 available 1.0.0
            !libfoo configured 1.0.0
          !fix configured 1.0.0
            !foo configured 1.0.0
              !libfoo configured 1.0.0
          !fex configured 1.0.0
            !foo configured 1.0.0
              !libfoo configured 1.0.0
            !libfoo configured 1.0.0
          !bus configured 1.0.0
            !foo configured 1.0.0
              !libfoo configured 1.0.0
            libbaz configured !0.1.0 available 1.0.0
          !bas configured 1.0.0
            !bus configured 1.0.0
              !foo configured 1.0.0
                !libfoo configured 1.0.0
              libbaz configured !0.1.0 available 1.0.0
            !libbar configured 1.0.0
          !box configured 1.0.0
            !libbar configured 1.0.0
            !libfoo configured 1.0.0
          !bax configured 1.0.0
            !libbar configured 1.0.0
            libbox configured !0.1.0 available 1.0.0
            !libfoo configured 1.0.0
          !buc configured 1.0.0
            !bux configured 1.0.0
              !libbar configured 1.0.0
            !libfoo configured 1.0.0
          !tax configured 1.0.0
            !libbar configured 1.0.0
            !libfoo configured 1.0.0
          !tex configured 1.0.0
            !libbar configured 1.0.0
            !libfoo configured 1.0.0
          !tiz configured 1.0.0
            !libbar configured 1.0.0
            !tex configured 1.0.0
              !libbar configured 1.0.0
              !libfoo configured 1.0.0
          !dex configured 1.0.0
            !bar configured 1.0.0
              !libbar configured 1.0.0
            !libfoo configured 1.0.0
          !dox configured 1.0.0
            !dex configured 1.0.0
              !bar configured 1.0.0
                !libbar configured 1.0.0
              !libfoo configured 1.0.0
          !dix configured 1.0.0
            !dox configured 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                !libfoo configured 1.0.0
            !libbar configured 1.0.0
            libbox configured !0.1.0 available 1.0.0
          !diz configured 1.0.0
            !dox configured 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                !libfoo configured 1.0.0
            !libbar configured 1.0.0
            libbox configured !0.1.0 available 1.0.0
          EOO

        $pkg_drop libfoo libbar libbiz foo fox fux fix fex bar baz bac bat \
                  bas bus box bax bux bix bex boo biz buz buc tax tex tix tiz \
                  toz tez tuz tux dex dix diz dox
      }

      : upgrade
      :
      {
        +$clone_cfg

        : recursive
        :
        {
          +$clone_cfg

          : libs
          :
          {
            $clone_cfg;

            $* ?libfoo/0.1.0 libbar/0.1.0 ?libbaz/0.1.0 ?libbox/0.1.0 \
               libbiz/0.1.0 foo fox fux fix fex bar baz bac bat bas bus \
               box bax bux bix bex boo biz buz buc tax tex tix tiz toz \
               tez tuz tux dex dix diz dox 2>!;

            $pkg_status -r >>EOO;
              !libbar configured !0.1.0 available 1.0.0
              !libbiz configured !0.1.0 available 1.0.0
              !bat configured 1.0.0
                libbaz configured !0.1.0 available 1.0.0
              !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tux configured 1.0.0
                libbox configured !0.1.0 available 1.0.0
                !tix configured 0.1.0 available 1.0.0
              !bar configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !bux configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !bex configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !boo configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
              !tez configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                !bux configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !foo configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fox configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fux configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !baz configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bac configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbaz configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
                libbaz configured !0.1.0 available 1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                  libbaz configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !box configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bax configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tax configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tex configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tiz configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                !tex configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    !libbar configured !0.1.0 available 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              EOO

            $* --upgrade --recursive 2>&1 | $warn_to_info 2>!;

            $pkg_status -r >>EOO;
              !libbar configured 1.0.0
              !libbiz configured 1.0.0
                !libbar configured 1.0.0
              !bat configured 1.0.0
                libbaz configured !1.0.0
              !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tux configured 1.0.0
                libbox configured !1.0.0
                !tix configured 0.1.0 available 1.0.0
              !bar configured 1.0.0
                !libbar configured 1.0.0
              !bux configured 1.0.0
                !libbar configured 1.0.0
              !bex configured 1.0.0
                !libbar configured 1.0.0
              !boo configured 1.0.0
                !libbar configured 1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  !libbar configured 1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured 1.0.0
              !tez configured 1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured 1.0.0
                !libbar configured 1.0.0
              !foo configured 1.0.0
                libfoo configured !1.0.0
              !fox configured 1.0.0
                libfoo configured !1.0.0
              !fux configured 1.0.0
                libfoo configured !1.0.0
              !baz configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !bac configured 1.0.0
                !libbar configured 1.0.0
                libbaz configured !1.0.0
                libfoo configured !1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libfoo configured !1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libbaz configured !1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured !1.0.0
                  libbaz configured !1.0.0
                !libbar configured 1.0.0
              !box configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !bax configured 1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
                libfoo configured !1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured 1.0.0
                libfoo configured !1.0.0
              !tax configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !tex configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !tiz configured 1.0.0
                !libbar configured 1.0.0
                !tex configured 1.0.0
                  !libbar configured 1.0.0
                  libfoo configured !1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                libfoo configured !1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    !libbar configured 1.0.0
                  libfoo configured !1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured 1.0.0
                    libfoo configured !1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured 1.0.0
                    libfoo configured !1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
              EOO

            $pkg_drop libfoo libbar libbiz foo fox fux fix fex bar baz bac \
                      bat bas bus box bax bux bix bex boo biz buz buc \
                      tax tex tix tiz toz tez tuz tux dex dix diz dox
          }

          : all
          :
          {
            $clone_cfg;

            $* ?libfoo/0.1.0 ?libbar/0.1.0 ?libbaz/0.1.0 ?libbox/0.1.0 \
               ?libbiz/0.1.0 foo/0.1.0 fox/0.1.0 fux/0.1.0 fix/0.1.0 fex/0.1.0 \
               bar/0.1.0 baz/0.1.0 bac/1.0.0 bat/1.0.0 bas/1.0.0 bus/0.1.0 \
               box/0.1.0 bax/1.0.0 bux/1.0.0 bix/1.0.0 bex/1.0.0 boo/1.0.0 \
               biz/0.1.0 buz/1.0.0 buc/1.0.0 tax/1.0.0 tex/0.1.0 tix/0.1.0 \
               tiz/1.0.0 toz/0.1.0 tez/1.0.0 tuz/1.0.0 tux/1.0.0 dex/1.0.0 \
               dix/1.0.0 diz/1.0.0 dox/1.0.0 2>!;

            $pkg_status -r >>EOO;
              !bat configured !1.0.0
                libbaz configured !0.1.0 available 1.0.0
              !biz configured !0.1.0 available 1.0.0
                libbiz configured !0.1.0 available 1.0.0
              !tix configured !0.1.0 available 1.0.0
              !toz configured !0.1.0 available 1.0.0 0.2.0
              !tuz configured !1.0.0
                !toz configured !0.1.0 available 1.0.0 0.2.0
              !box configured !0.1.0 available 1.0.0 0.2.0
                libbox configured !0.1.0 available 1.0.0
              !tux configured !1.0.0
                libbox configured !0.1.0 available 1.0.0
                !tix configured !0.1.0 available 1.0.0
              !fox configured !0.1.0 available 1.0.0 0.2.0
                libbar configured !0.1.0 available 1.0.0
              !bar configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
              !bux configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
              !bex configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
              !boo configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
              !buz configured !1.0.0
                !bux configured !1.0.0
                  libbar configured !0.1.0 available 1.0.0
              !tez configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                !toz configured !0.1.0 available 1.0.0 0.2.0
              !bix configured !1.0.0
                !bar configured !0.1.0 available 1.0.0
                  libbar configured !0.1.0 available 1.0.0
                !bux configured !1.0.0
                  libbar configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
              !foo configured !0.1.0 available 1.0.0 0.2.0
                libfoo configured !0.1.0 available 1.0.0
              !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                libfoo configured !0.1.0 available 1.0.0
              !fex configured !0.1.0 available 1.0.0
                !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                  libfoo configured !0.1.0 available 1.0.0
              !baz configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bac configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbaz configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fix configured !0.1.0 available 1.0.0
                !foo configured !0.1.0 available 1.0.0 0.2.0
                  libfoo configured !0.1.0 available 1.0.0
              !bus configured !0.1.0 available 1.0.0
                !foo configured !0.1.0 available 1.0.0 0.2.0
                  libfoo configured !0.1.0 available 1.0.0
              !bas configured !1.0.0
                !bus configured !0.1.0 available 1.0.0
                  !foo configured !0.1.0 available 1.0.0 0.2.0
                    libfoo configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
              !bax configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !buc configured !1.0.0
                !bux configured !1.0.0
                  libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tax configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tex configured !0.1.0 available 1.0.0 0.3.0 0.2.0
                libfoo configured !0.1.0 available 1.0.0
              !tiz configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                !tex configured !0.1.0 available 1.0.0 0.3.0 0.2.0
                  libfoo configured !0.1.0 available 1.0.0
              !dex configured !1.0.0
                !bar configured !0.1.0 available 1.0.0
                  libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !dox configured !1.0.0
                !dex configured !1.0.0
                  !bar configured !0.1.0 available 1.0.0
                    libbar configured !0.1.0 available 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !dix configured !1.0.0
                !dox configured !1.0.0
                  !dex configured !1.0.0
                    !bar configured !0.1.0 available 1.0.0
                      libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              !diz configured !1.0.0
                !dox configured !1.0.0
                  !dex configured !1.0.0
                    !bar configured !0.1.0 available 1.0.0
                      libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              EOO

            $* --upgrade --recursive 2>&1 | $warn_to_info 2>!;

            $pkg_status -r >>EOO;
              !bat configured 1.0.0
                libbaz configured !1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  libbar configured !1.0.0
              !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !box configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !tux configured 1.0.0
                libbox configured !1.0.0
                !tix configured 0.1.0 available 1.0.0
              !fox configured 1.0.0
                libfoo configured !1.0.0
              !bar configured 1.0.0
                libbar configured !1.0.0
              !bux configured 1.0.0
                libbar configured !1.0.0
              !bex configured 1.0.0
                libbar configured !1.0.0
              !boo configured 1.0.0
                libbar configured !1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  libbar configured !1.0.0
              !tez configured 1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  libbar configured !1.0.0
                !bux configured 1.0.0
                  libbar configured !1.0.0
                libbar configured !1.0.0
              !foo configured 1.0.0
                libfoo configured !1.0.0
              !fux configured 1.0.0
                libfoo configured !1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libfoo configured !1.0.0
              !baz configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !bac configured 1.0.0
                libbar configured !1.0.0
                libbaz configured !1.0.0
                libfoo configured !1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libbaz configured !1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured !1.0.0
                  libbaz configured !1.0.0
                libbar configured !1.0.0
              !bax configured 1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
                libfoo configured !1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  libbar configured !1.0.0
                libfoo configured !1.0.0
              !tax configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !tex configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !tiz configured 1.0.0
                libbar configured !1.0.0
                !tex configured 1.0.0
                  libbar configured !1.0.0
                  libfoo configured !1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  libbar configured !1.0.0
                libfoo configured !1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    libbar configured !1.0.0
                  libfoo configured !1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured !1.0.0
                    libfoo configured !1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured !1.0.0
                    libfoo configured !1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
              EOO

            $pkg_drop foo fox fux fix fex bar baz bac bat bas bus box bax bux \
                      bix bex boo biz buz buc tax tex tix tiz toz tez tuz tux \
                      dex dix diz dox
          }
        }

        : immediate
        :
        {
          +$clone_cfg

          : libs
          :
          {
            $clone_cfg;

            $* ?libfoo/0.1.0 libbar/0.1.0 ?libbaz/0.1.0 ?libbox/0.1.0 \
               libbiz/0.1.0 foo fox fux fix fex bar baz bac bat bas bus \
               box bax bux bix bex boo biz buz buc tax tex tix tiz toz \
               tez tuz tux dex dix diz dox 2>!;

            $pkg_status -r >>EOO;
              !libbar configured !0.1.0 available 1.0.0
              !libbiz configured !0.1.0 available 1.0.0
              !bat configured 1.0.0
                libbaz configured !0.1.0 available 1.0.0
              !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tux configured 1.0.0
                libbox configured !0.1.0 available 1.0.0
                !tix configured 0.1.0 available 1.0.0
              !bar configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !bux configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !bex configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !boo configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
              !tez configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                !bux configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !foo configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fox configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fux configured 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !baz configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bac configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbaz configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
                libbaz configured !0.1.0 available 1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                  libbaz configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
              !box configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bax configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tax configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tex configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tiz configured 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                !tex configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    !libbar configured !0.1.0 available 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                !libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              EOO

            $* --upgrade --immediate 2>&1 | $warn_to_info 2>!;

            $pkg_status -r >>EOO;
              !libbar configured 1.0.0
              !libbiz configured 1.0.0
                !libbar configured 1.0.0
              !bat configured 1.0.0
                libbaz configured !1.0.0
              !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tux configured 1.0.0
                libbox configured !1.0.0
                !tix configured 0.1.0 available 1.0.0
              !bar configured 1.0.0
                !libbar configured 1.0.0
              !bux configured 1.0.0
                !libbar configured 1.0.0
              !bex configured 1.0.0
                !libbar configured 1.0.0
              !boo configured 1.0.0
                !libbar configured 1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  !libbar configured 1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured 1.0.0
              !tez configured 1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured 1.0.0
                !libbar configured 1.0.0
              !foo configured 1.0.0
                libfoo configured !1.0.0
              !fox configured 1.0.0
                libfoo configured !1.0.0
              !fux configured 1.0.0
                libfoo configured !1.0.0
              !baz configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !bac configured 1.0.0
                !libbar configured 1.0.0
                libbaz configured !1.0.0
                libfoo configured !1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libfoo configured !1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libbaz configured !1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured !1.0.0
                  libbaz configured !1.0.0
                !libbar configured 1.0.0
              !box configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !bax configured 1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
                libfoo configured !1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  !libbar configured 1.0.0
                libfoo configured !1.0.0
              !tax configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !tex configured 1.0.0
                !libbar configured 1.0.0
                libfoo configured !1.0.0
              !tiz configured 1.0.0
                !libbar configured 1.0.0
                !tex configured 1.0.0
                  !libbar configured 1.0.0
                  libfoo configured !1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                libfoo configured !1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    !libbar configured 1.0.0
                  libfoo configured !1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured 1.0.0
                    libfoo configured !1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      !libbar configured 1.0.0
                    libfoo configured !1.0.0
                !libbar configured 1.0.0
                libbox configured !1.0.0
              EOO

            $pkg_drop libfoo libbar libbiz foo fox fux fix fex bar baz bac \
                      bat bas bus box bax bux bix bex boo biz buz buc tax \
                      tex tix tiz toz tez tuz tux dex dix diz dox
          }

          : all
          :
          {
            $clone_cfg;

            $* ?libfoo/0.1.0 ?libbar/0.1.0 ?libbaz/0.1.0 ?libbox/0.1.0 \
               ?libbiz/0.1.0 foo/0.1.0 fox/0.1.0 fux/0.1.0 fix/0.1.0 fex/0.1.0 \
               bar/0.1.0 baz/0.1.0 bac/1.0.0 bat/1.0.0 bas/1.0.0 bus/0.1.0 \
               box/0.1.0 bax/1.0.0 bux/1.0.0 bix/1.0.0 bex/1.0.0 boo/1.0.0 \
               biz/0.1.0 buz/1.0.0 buc/1.0.0 tax/1.0.0 tex/0.1.0 tix/0.1.0 \
               tiz/1.0.0 toz/0.1.0 tez/1.0.0 tuz/1.0.0 tux/1.0.0 dex/1.0.0 \
               dix/1.0.0 diz/1.0.0 dox/1.0.0 2>!;

            $pkg_status -r >>EOO;
              !bat configured !1.0.0
                libbaz configured !0.1.0 available 1.0.0
              !biz configured !0.1.0 available 1.0.0
                libbiz configured !0.1.0 available 1.0.0
              !tix configured !0.1.0 available 1.0.0
              !toz configured !0.1.0 available 1.0.0 0.2.0
              !tuz configured !1.0.0
                !toz configured !0.1.0 available 1.0.0 0.2.0
              !box configured !0.1.0 available 1.0.0 0.2.0
                libbox configured !0.1.0 available 1.0.0
              !tux configured !1.0.0
                libbox configured !0.1.0 available 1.0.0
                !tix configured !0.1.0 available 1.0.0
              !fox configured !0.1.0 available 1.0.0 0.2.0
                libbar configured !0.1.0 available 1.0.0
              !bar configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
              !bux configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
              !bex configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
              !boo configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
              !buz configured !1.0.0
                !bux configured !1.0.0
                  libbar configured !0.1.0 available 1.0.0
              !tez configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                !toz configured !0.1.0 available 1.0.0 0.2.0
              !bix configured !1.0.0
                !bar configured !0.1.0 available 1.0.0
                  libbar configured !0.1.0 available 1.0.0
                !bux configured !1.0.0
                  libbar configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
              !foo configured !0.1.0 available 1.0.0 0.2.0
                libfoo configured !0.1.0 available 1.0.0
              !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                libfoo configured !0.1.0 available 1.0.0
              !fex configured !0.1.0 available 1.0.0
                !fux configured !0.1.0 available 1.0.0 0.2.0 0.1.1
                  libfoo configured !0.1.0 available 1.0.0
              !baz configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !bac configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbaz configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !fix configured !0.1.0 available 1.0.0
                !foo configured !0.1.0 available 1.0.0 0.2.0
                  libfoo configured !0.1.0 available 1.0.0
              !bus configured !0.1.0 available 1.0.0
                !foo configured !0.1.0 available 1.0.0 0.2.0
                  libfoo configured !0.1.0 available 1.0.0
              !bas configured !1.0.0
                !bus configured !0.1.0 available 1.0.0
                  !foo configured !0.1.0 available 1.0.0 0.2.0
                    libfoo configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
              !bax configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !buc configured !1.0.0
                !bux configured !1.0.0
                  libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tax configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !tex configured !0.1.0 available 1.0.0 0.3.0 0.2.0
                libfoo configured !0.1.0 available 1.0.0
              !tiz configured !1.0.0
                libbar configured !0.1.0 available 1.0.0
                !tex configured !0.1.0 available 1.0.0 0.3.0 0.2.0
                  libfoo configured !0.1.0 available 1.0.0
              !dex configured !1.0.0
                !bar configured !0.1.0 available 1.0.0
                  libbar configured !0.1.0 available 1.0.0
                libfoo configured !0.1.0 available 1.0.0
              !dox configured !1.0.0
                !dex configured !1.0.0
                  !bar configured !0.1.0 available 1.0.0
                    libbar configured !0.1.0 available 1.0.0
                  libfoo configured !0.1.0 available 1.0.0
              !dix configured !1.0.0
                !dox configured !1.0.0
                  !dex configured !1.0.0
                    !bar configured !0.1.0 available 1.0.0
                      libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              !diz configured !1.0.0
                !dox configured !1.0.0
                  !dex configured !1.0.0
                    !bar configured !0.1.0 available 1.0.0
                      libbar configured !0.1.0 available 1.0.0
                    libfoo configured !0.1.0 available 1.0.0
                libbar configured !0.1.0 available 1.0.0
                libbox configured !0.1.0 available 1.0.0
              EOO

            $* --upgrade --immediate 2>&1 | $warn_to_info 2>!;

            $pkg_status -r >>EOO;
              !bat configured 1.0.0
                libbaz configured !1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  libbar configured !1.0.0
              !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !box configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !tux configured 1.0.0
                libbox configured !1.0.0
                !tix configured 0.1.0 available 1.0.0
              !fox configured 1.0.0
                libfoo configured !1.0.0
              !bar configured 1.0.0
                libbar configured !1.0.0
              !bux configured 1.0.0
                libbar configured !1.0.0
              !bex configured 1.0.0
                libbar configured !1.0.0
              !boo configured 1.0.0
                libbar configured !1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  libbar configured !1.0.0
              !tez configured 1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  libbar configured !1.0.0
                !bux configured 1.0.0
                  libbar configured !1.0.0
                libbar configured !1.0.0
              !foo configured 1.0.0
                libfoo configured !1.0.0
              !fux configured 1.0.0
                libfoo configured !1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libfoo configured !1.0.0
              !baz configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !bac configured 1.0.0
                libbar configured !1.0.0
                libbaz configured !1.0.0
                libfoo configured !1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured !1.0.0
                libbaz configured !1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured !1.0.0
                  libbaz configured !1.0.0
                libbar configured !1.0.0
              !bax configured 1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
                libfoo configured !1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  libbar configured !1.0.0
                libfoo configured !1.0.0
              !tax configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !tex configured 1.0.0
                libbar configured !1.0.0
                libfoo configured !1.0.0
              !tiz configured 1.0.0
                libbar configured !1.0.0
                !tex configured 1.0.0
                  libbar configured !1.0.0
                  libfoo configured !1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  libbar configured !1.0.0
                libfoo configured !1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    libbar configured !1.0.0
                  libfoo configured !1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured !1.0.0
                    libfoo configured !1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured !1.0.0
                    libfoo configured !1.0.0
                libbar configured !1.0.0
                libbox configured !1.0.0
              EOO

            $pkg_drop foo fox fux fix fex bar baz bac bat bas bus box bax bux \
                      bix bex boo biz buz buc tax tex tix tiz toz tez tuz tux \
                      dex dix diz dox
          }
        }
      }

      : incrementally
      :
      {
        +$clone_cfg

        : all
        :
        {
          $clone_cfg;

          ps = libfoo libbar libbaz libbox libbiz foo fox fux fix fex bar baz \
               bac bat bas bus box bax bux bix bex boo biz buz buc tax tex \
               tix tiz toz tez tuz tux dex dix diz dox;

          for p: $ps
            $* $p 2>&1 | $warn_to_info 2>!
          end;

          $pkg_status -r >>EOO;
            !libfoo configured 1.0.0
            !libbar configured 1.0.0
            !libbaz configured 1.0.0
            !libbox configured 1.0.0
            !libbiz configured 1.0.0
              !libbar configured 1.0.0
            !foo configured 1.0.0
              !libfoo configured 1.0.0
            !fox configured 1.0.0
              !libfoo configured 1.0.0
            !fux configured 1.0.0
              !libfoo configured 1.0.0
            !fix configured 1.0.0
              !foo configured 1.0.0
                !libfoo configured 1.0.0
            !fex configured 1.0.0
              !foo configured 1.0.0
                !libfoo configured 1.0.0
              !libfoo configured 1.0.0
            !bar configured 1.0.0
              !libbar configured 1.0.0
            !baz configured 1.0.0
              !libbar configured 1.0.0
              !libfoo configured 1.0.0
            !bac configured 1.0.0
              !libbar configured 1.0.0
              !libbaz configured 1.0.0
              !libfoo configured 1.0.0
            !bat configured 1.0.0
              !libbaz configured 1.0.0
            !bus configured 1.0.0
              !foo configured 1.0.0
                !libfoo configured 1.0.0
              !libbaz configured 1.0.0
            !bas configured 1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  !libfoo configured 1.0.0
                !libbaz configured 1.0.0
              !libbar configured 1.0.0
            !box configured 1.0.0
              !libbar configured 1.0.0
              !libfoo configured 1.0.0
            !bax configured 1.0.0
              !libbar configured 1.0.0
              !libbox configured 1.0.0
              !libfoo configured 1.0.0
            !bux configured 1.0.0
              !libbar configured 1.0.0
            !bix configured 1.0.0
              !bar configured 1.0.0
                !libbar configured 1.0.0
              !bux configured 1.0.0
                !libbar configured 1.0.0
              !libbar configured 1.0.0
            !bex configured 1.0.0
              !libbar configured 1.0.0
            !boo configured 1.0.0
              !libbar configured 1.0.0
            !biz configured 1.0.0
              !boo configured 1.0.0
                !libbar configured 1.0.0
            !buz configured 1.0.0
              !bux configured 1.0.0
                !libbar configured 1.0.0
            !buc configured 1.0.0
              !bux configured 1.0.0
                !libbar configured 1.0.0
              !libfoo configured 1.0.0
            !tax configured 1.0.0
              !libbar configured 1.0.0
              !libfoo configured 1.0.0
            !tex configured 1.0.0
              !libbar configured 1.0.0
              !libfoo configured 1.0.0
            !tix configured 0.1.0 available 1.0.0
            !tiz configured 1.0.0
              !libbar configured 1.0.0
              !tex configured 1.0.0
                !libbar configured 1.0.0
                !libfoo configured 1.0.0
            !toz configured 0.1.0 available 1.0.0 0.2.0
            !tez configured 1.0.0
              !libbar configured 1.0.0
              !libbox configured 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
            !tuz configured 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
            !tux configured 1.0.0
              !libbox configured 1.0.0
              !tix configured 0.1.0 available 1.0.0
            !dex configured 1.0.0
              !bar configured 1.0.0
                !libbar configured 1.0.0
              !libfoo configured 1.0.0
            !dox configured 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  !libbar configured 1.0.0
                !libfoo configured 1.0.0
            !dix configured 1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    !libbar configured 1.0.0
                  !libfoo configured 1.0.0
              !libbar configured 1.0.0
              !libbox configured 1.0.0
            !diz configured 1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    !libbar configured 1.0.0
                  !libfoo configured 1.0.0
              !libbar configured 1.0.0
              !libbox configured 1.0.0
            EOO

          # Drop the configured packages by sequentially turning all of them
          # into dependencies.
          #
          for p: $ps
            $* ?$p 2>!
          end
        }

        : applications
        :
        {
          +$clone_cfg

          : direct-order
          :
          {
            $clone_cfg;

            ps = foo fox fux fix fex bar baz bac bat bas bus \
                 box bax bux bix bex boo biz buz buc tax tex \
                 tix tiz toz tez tuz tux dex dix diz dox;

            for p: $ps
              $* $p 2>&1 | $warn_to_info 2>!
            end;

            $pkg_status -r >>EOO;
              !foo configured 1.0.0
                libfoo configured 1.0.0
              !fox configured 1.0.0
                libfoo configured 1.0.0
              !fux configured 1.0.0
                libfoo configured 1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
                libfoo configured 1.0.0
              !bar configured 1.0.0
                libbar configured 1.0.0
              !baz configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !bac configured 1.0.0
                libbar configured 1.0.0
                libbaz configured 1.0.0
                libfoo configured 1.0.0
              !bat configured 1.0.0
                libbaz configured 1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
                libbaz configured 1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured 1.0.0
                  libbaz configured 1.0.0
                libbar configured 1.0.0
              !box configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !bax configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
                libfoo configured 1.0.0
              !bux configured 1.0.0
                libbar configured 1.0.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  libbar configured 1.0.0
                !bux configured 1.0.0
                  libbar configured 1.0.0
                libbar configured 1.0.0
              !bex configured 1.0.0
                libbar configured 1.0.0
              !boo configured 1.0.0
                libbar configured 1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  libbar configured 1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  libbar configured 1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  libbar configured 1.0.0
                libfoo configured 1.0.0
              !tax configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !tix configured 0.1.0 available 1.0.0
              !tiz configured 1.0.0
                libbar configured 1.0.0
                !tex configured 1.0.0
                  libbar configured 1.0.0
                  libfoo configured 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tez configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tux configured 1.0.0
                libbox configured 1.0.0
                !tix configured 0.1.0 available 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  libbar configured 1.0.0
                libfoo configured 1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    libbar configured 1.0.0
                  libfoo configured 1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured 1.0.0
                    libfoo configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured 1.0.0
                    libfoo configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
              EOO

            # Drop the configured packages by sequentially turning all of them
            # into dependencies.
            #
            for p: $ps
              $* ?$p 2>&1 | $warn_to_info 2>!
            end
          }

          : reverse-order
          :
          {
            $clone_cfg;

            ps = dox diz dix dex tux tuz tez toz tiz tix tex tax buc buz biz \
                 boo bex bix bux bax box bus bas bat bac baz bar fex fix fux \
                 fox foo;

            for p: $ps
              $* $p 2>&1 | $warn_to_info 2>!
            end;

            $pkg_status -r >>EOO;
              !bar configured 1.0.0
                libbar configured 1.0.0
              !dex configured 1.0.0
                !bar configured 1.0.0
                  libbar configured 1.0.0
                libfoo configured 1.0.0
              !dox configured 1.0.0
                !dex configured 1.0.0
                  !bar configured 1.0.0
                    libbar configured 1.0.0
                  libfoo configured 1.0.0
              !diz configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured 1.0.0
                    libfoo configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
              !dix configured 1.0.0
                !dox configured 1.0.0
                  !dex configured 1.0.0
                    !bar configured 1.0.0
                      libbar configured 1.0.0
                    libfoo configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
              !tix configured 0.1.0 available 1.0.0
              !tux configured 1.0.0
                libbox configured 1.0.0
                !tix configured 0.1.0 available 1.0.0
              !toz configured 0.1.0 available 1.0.0 0.2.0
              !tuz configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tez configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
                !toz configured 0.1.0 available 1.0.0 0.2.0
              !tex configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !tiz configured 1.0.0
                libbar configured 1.0.0
                !tex configured 1.0.0
                  libbar configured 1.0.0
                  libfoo configured 1.0.0
              !tax configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !bux configured 1.0.0
                libbar configured 1.0.0
              !buc configured 1.0.0
                !bux configured 1.0.0
                  libbar configured 1.0.0
                libfoo configured 1.0.0
              !buz configured 1.0.0
                !bux configured 1.0.0
                  libbar configured 1.0.0
              !boo configured 1.0.0
                libbar configured 1.0.0
              !biz configured 1.0.0
                !boo configured 1.0.0
                  libbar configured 1.0.0
              !bex configured 1.0.0
                libbar configured 1.0.0
              !bix configured 1.0.0
                !bar configured 1.0.0
                  libbar configured 1.0.0
                !bux configured 1.0.0
                  libbar configured 1.0.0
                libbar configured 1.0.0
              !bax configured 1.0.0
                libbar configured 1.0.0
                libbox configured 1.0.0
                libfoo configured 1.0.0
              !box configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !foo configured 1.0.0
                libfoo configured 1.0.0
              !bus configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
                libbaz configured 1.0.0
              !bas configured 1.0.0
                !bus configured 1.0.0
                  !foo configured 1.0.0
                    libfoo configured 1.0.0
                  libbaz configured 1.0.0
                libbar configured 1.0.0
              !bat configured 1.0.0
                libbaz configured 1.0.0
              !bac configured 1.0.0
                libbar configured 1.0.0
                libbaz configured 1.0.0
                libfoo configured 1.0.0
              !baz configured 1.0.0
                libbar configured 1.0.0
                libfoo configured 1.0.0
              !fex configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
                libfoo configured 1.0.0
              !fix configured 1.0.0
                !foo configured 1.0.0
                  libfoo configured 1.0.0
              !fux configured 1.0.0
                libfoo configured 1.0.0
              !fox configured 1.0.0
                libfoo configured 1.0.0
              EOO

            # Drop the configured packages by sequentially turning all of them
            # into dependencies.
            #
            for p: $ps
              $* ?$p 2>!
            end
          }

          : reordered
          :
          : Vary the order of package builds. Note that the first order is the
          : original direct package order and the last one is the reverse
          : order.
          :
          if $all
          {
            $clone_cfg;

            ds = foo fox fux fix fex bar baz bac bat bas bus box bax bux bix \
                 bex boo biz buz buc tax tex tix tiz toz tez tuz tux dex dix \
                 diz dox tvz '';

            # Prepare the package build list.
            #
            for i: $integer.integer_sequence(1, $name.size($ds))
              d = ($ds[$i])
              ps =

              prepend = true
              for p: $ds
                if ($p == $d)
                  prepend = false
                end

                if ($p != '')
                  if $prepend
                    ps =+ $p
                  else
                    ps += $p
                  end
                end
              end

              echo $ps >&2 2>|

              # Build the packages, one at a time, creating the list of
              # successfully built packages.
              #
              # Note that a package build may potentially fail due to some
              # ambiguity which requires user's additional input. We just
              # silently ignore such failures.
              #
              cps =
              for p: $ps
                timeout 120
                if $* $p 2>&1 | $warn_to_info 2>!
                  cps += $p
                end
              end

              # Drop the configured packages by sequentially turning all of
              # them into dependencies.
              #
              for p: $cps
                timeout 120
                $* ?$p 2>!
              end
            end
          }
        }
      }
    }
  }

  : config-negotiation
  :
  {
    test.arguments += --yes --plan 'build plan:'

    : proj-better-choice
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13a && $rep_fetch

      : bar-baz-biz
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.backend=cli (set by bar)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = cli
          EOO

        # Make sure that since baz doesn't reconfigure liba (it also accepts
        # the cli backend for liba) the re-evaluated existing dependents bar
        # and the liba dependency doesn't get reconfigured.
        #
        $* baz 2>>~%EOE%;
          build plan:
            new baz/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = cli
          EOO

        # Make sure that when biz reconfigures liba (it only accepts the gui
        # backend for liba), the re-evaluated existing dependents bar and baz
        # are also reconfigured.
        #
        $* biz 2>>~%EOE%;
          build plan:
            reconfigure/update liba/1.0.0 (required by bar, baz, biz)
              config.liba.backend=gui (set by biz)
            reconfigure baz/1.0.0 (dependent of liba)
            reconfigure bar/1.0.0 (dependent of liba)
            new biz/1.0.0
          disfigured bar/1.0.0
          disfigured baz/1.0.0
          disfigured liba/1.0.0
          fetched biz/1.0.0
          unpacked biz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          configured bar/1.0.0
          configured biz/1.0.0
          %info: .+biz.+ is up to date%
          %info: .+baz.+ is up to date%
          %info: .+bar.+ is up to date%
          updated biz/1.0.0
          updated baz/1.0.0
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          !biz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = gui
          EOO

        $pkg_drop bar baz biz
      }

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz)
              config.liba.backend=gui (set by baz)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = gui
          EOO

        $pkg_drop baz
      }

      : bar-baz
      :
      {
        $clone_cfg;

        $* bar baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar, baz)
              config.liba.backend=cli (set by bar)
            new bar/1.0.0
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured baz/1.0.0
          %info: .+bar.+ is up to date%
          %info: .+baz.+ is up to date%
          updated bar/1.0.0
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = cli
          EOO

        $pkg_drop bar baz
      }

      : baz-bar
      :
      {
        $clone_cfg;

        $* baz bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar, baz)
              config.liba.backend=cli (set by bar)
            new baz/1.0.0
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          configured bar/1.0.0
          %info: .+baz.+ is up to date%
          %info: .+bar.+ is up to date%
          updated baz/1.0.0
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        # Would have been cool to end up with gui but looks like we have a map
        # in configuration cluster.
        #
        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = cli
          EOO

        $pkg_drop baz bar
      }

      : bar-baz-biz-box
      :
      {
        $clone_cfg;

        $* bar baz biz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar, baz, biz)
              config.liba.backend=gui (set by biz)
            new bar/1.0.0
            new baz/1.0.0
            new biz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          fetched biz/1.0.0
          unpacked biz/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured baz/1.0.0
          configured biz/1.0.0
          %info: .+bar.+ is up to date%
          %info: .+baz.+ is up to date%
          %info: .+biz.+ is up to date%
          updated bar/1.0.0
          updated baz/1.0.0
          updated biz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          !biz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = gui
          EOO

        # Make sure that since box doesn't reconfigure liba (it accepts any
        # backend for liba and just reflects it in its own configuration) none
        # of the re-evaluated existing dependents nor the liba dependency get
        # reconfigured.
        #
        $* box 2>>~%EOE%;
          build plan:
            new box/1.0.0
              config.box.liba_backend=gui (set by box)
          fetched box/1.0.0
          unpacked box/1.0.0
          configured box/1.0.0
          %info: .+box.+ is up to date%
          updated box/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          !biz configured 1.0.0
            liba configured 1.0.0
          !box configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.backend = gui
          EOO

        cat cfg/box-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.box.liba_backend = gui
          EOO

        $pkg_drop bar baz biz box
      }
    }

    : proj-better-value
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13b && $rep_fetch

      : liba
      :
      {
        $clone_cfg;

        $* liba 2>>~%EOE%;
          build plan:
            new liba/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          configured liba/1.0.0
          %info: .+liba.+ is up to date%
          updated liba/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = false
          config.liba.buffer = 1024
          EOO

        $pkg_drop liba
      }

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.buffer=2048 (set by bar)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = false
          config.liba.buffer = 2048
          EOO

        $pkg_drop bar
      }

      : bar-liba
      :
      {
        $clone_cfg;

        $* bar ?liba +{ config.liba.x=true } 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.x=true (user configuration)
              config.liba.buffer=10240 (set by bar)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 10240
          EOO

        $pkg_drop bar
      }

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz)
              config.liba.buffer=4096 (set by baz)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = false
          config.liba.buffer = 4096
          EOO

        $pkg_drop baz
      }

      : baz-liba
      :
      {
        $clone_cfg;

        $* baz ?liba +{ config.liba.x=true } 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz)
              config.liba.x=true (user configuration)
              config.liba.buffer=10240 (set by baz)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 10240
          EOO

        $pkg_drop baz
      }

      : baz-biz
      :
      {
        $clone_cfg;

        $* baz biz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz, biz)
          %(
              config.liba.buffer=10240 (set by baz)
              config.liba.x=true (set by biz)
          %|
              config.liba.x=true (set by biz)
              config.liba.buffer=10240 (set by baz)
          %)
            new baz/1.0.0
            new biz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          fetched biz/1.0.0
          unpacked biz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          configured biz/1.0.0
          %info: .+baz.+ is up to date%
          %info: .+biz.+ is up to date%
          updated baz/1.0.0
          updated biz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          !biz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 10240
          EOO

        $pkg_drop baz biz
      }
    }

    : proj-disable-unused
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13c && $rep_fetch

      : liba
      :
      {
        $clone_cfg;

        $* liba 2>>~%EOE%;
          build plan:
            new liba/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          configured liba/1.0.0
          %info: .+liba.+ is up to date%
          updated liba/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          EOO

        $pkg_drop liba
      }

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          <depends-reflect-clause>:1:5: info: false
            info: reflect clause:
              info $config.liba.x
            info: in depends manifest value of package bar
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.x=false (set by bar)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = false
          EOO

        $pkg_drop bar
      }

      : bar-baz
      :
      {
        $clone_cfg;

        $* bar baz 2>>~%EOE%;
          <depends-reflect-clause>:1:5: info: true
            info: reflect clause:
              info $config.liba.x
            info: in depends manifest value of package bar
          build plan:
            new liba/1.0.0 (required by bar, baz)
              config.liba.x=true (set by baz)
            new bar/1.0.0
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured baz/1.0.0
          %info: .+bar.+ is up to date%
          %info: .+baz.+ is up to date%
          updated bar/1.0.0
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          EOO

        $pkg_drop bar baz
      }

      : bar-liba
      :
      {
        $clone_cfg;

        $* bar ?liba +{ config.liba.x=true } 2>>~%EOE%;
          <depends-reflect-clause>:1:5: info: true
            info: reflect clause:
              info $config.liba.x
            info: in depends manifest value of package bar
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.x=true (user configuration)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          EOO

        $pkg_drop bar
      }
    }

    : proj-use-if-available
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13d && $rep_fetch

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar, baz)
              config.liba.x=true (set by baz)
            new bar/1.0.0 (required by baz)
              config.bar.liba_x=true (set by bar)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            bar configured 1.0.0
              liba configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          EOO

        $pkg_drop baz
      }

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new libb/1.0.0 (required by bar)
            new bar/1.0.0
              config.bar.liba_x=false (set by bar)
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched libb/1.0.0
          unpacked libb/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured libb/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
            libb configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = false
          EOO

        $pkg_drop bar
      }
    }

    : proj-bogus-config
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13e && $rep_fetch

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz, biz)
              config.liba.x=true (set by biz)
            new biz/1.0.0 (required by baz)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched biz/1.0.0
          unpacked biz/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured biz/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            biz configured 1.0.0
              liba configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 1024
          EOO

        $pkg_drop baz
      }
    }

    : proj-bogus-config-cycle
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13f && $rep_fetch

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE% != 0;
          error: unable to remove bogus configuration values without causing configuration refinement cycle
            info: consider manually specifying one or more of the following variables as user configuration
          %(
              config.liba.buffer=2048
              config.liba.x=true
          %|
              config.liba.x=true
              config.liba.buffer=2048
          %)
          EOE

        $* baz ?liba +{ config.liba.x=true } 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz)
              config.liba.x=true (user configuration)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 1024
          EOO

        $pkg_drop baz
      }
    }

    : proj-detect-unset
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13g && $rep_fetch

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>EOE != 0
          <depends-accept-clause>:1:3: error: undefined dependency configuration variable config.liba.x
            info: was config.liba.x set in earlier prefer or require clause?
            info: accept condition: ($config.liba.x)
            info: in depends manifest value of package bar
          EOE
      }

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>EOE != 0
          <depends-enable-clause>:1:3: error: undefined dependency configuration variable config.liba.x
            info: was config.liba.x set in earlier prefer or require clause?
            info: enable condition: ($config.liba.x)
            info: in depends manifest value of package baz
          info: while satisfying baz/1.0.0
          EOE
      }

      : biz
      :
      {
        $clone_cfg;

        $* biz 2>>EOE != 0
          <depends-prefer-clause>:1:12: error: undefined dependency configuration variable config.liba.x
            info: was config.liba.x set in earlier prefer or require clause?
            info: prefer clause:
              x = (!$config.liba.x) # Error.
            info: in depends manifest value of package biz
          EOE
      }

      : box
      :
      {
        $clone_cfg;

        $* box 2>>EOE != 0
          <depends-reflect-clause>:1:12: error: undefined dependency configuration variable config.liba.x
            info: was config.liba.x set in earlier prefer or require clause?
            info: reflect clause:
              x = (!$config.liba.x) # Error.
            info: in depends manifest value of package box
          EOE
      }
    }

    : proj-cycle
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13h && $rep_fetch

      : bar baz
      :
      {
        $clone_cfg;

        $* bar baz 2>>EOE != 0
          error: unable to negotiate acceptable configuration between dependents baz, bar for dependencies liba
            info: configuration before negotiation:
              config.liba.buffer=4096 (set by bar)
            info: configuration after negotiation:
              config.liba.buffer=8192 (set by baz)
          EOE
      }
    }

    : proj-dependency-reflect
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13i && $rep_fetch

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          <depends-reflect-clause>:1:5: info: yes
            info: reflect clause:
              info ($config.liba.x ? yes : no)
            info: in depends manifest value of package bar
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.x=true (set by bar)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 1024
          EOO

        $pkg_drop bar
      }

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          <depends-reflect-clause>:1:5: info: 4096
            info: reflect clause:
              info $config.liba.buffer
            info: in depends manifest value of package baz
          build plan:
            new liba/1.0.0 (required by baz)
              config.liba.buffer=4096 (set by baz)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = false
          config.liba.buffer = 4096
          EOO

        $pkg_drop baz
      }
    }

    : proj-non-sensible
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13j && $rep_fetch

      : bar-baz
      :
      {
        $clone_cfg;

        $* bar baz 2>>/~%EOE% != 0
          error: unable to negotiate sensible configuration for dependency liba
          %  .+/root.build:5:1: error: buffer must be at least 4096 if feature x is enabled%
            info: negotiated configuration:
          %(
              config.liba.buffer=2048 (set by bar)
              config.liba.x=true (set by baz)
          %|
              config.liba.x=true (set by baz)
              config.liba.buffer=2048 (set by bar)
          %)
          EOE
      }

      : biz-baz
      :
      {
        $clone_cfg;

        $* biz baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by baz, biz)
          %(
              config.liba.buffer=4096 (set by biz)
              config.liba.x=true (set by baz)
          %|
              config.liba.x=true (set by baz)
              config.liba.buffer=4096 (set by biz)
          %)
            new biz/1.0.0
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched biz/1.0.0
          unpacked biz/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured biz/1.0.0
          configured baz/1.0.0
          %info: .+biz.+ is up to date%
          %info: .+baz.+ is up to date%
          updated biz/1.0.0
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !biz configured 1.0.0
            liba configured 1.0.0
          !baz configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.buffer = 4096
          EOO

        $pkg_drop biz baz
      }
    }

    : proj-unaccept
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13k && $rep_fetch

      : bar-baz
      :
      {
        $clone_cfg;

        $* bar baz 2>>EOE != 0
          error: unable to negotiate acceptable configuration with dependent bar for dependencies liba
            info: configuration before negotiation:
              config.liba.buffer=8192 (set by baz)
          EOE
      }
    }

    : proj-require-system
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13l && $rep_fetch

      : bar
      :
      {
        +$clone_cfg

        : basic
        :
        {
          $clone_cfg;

          $* bar 2>>~%EOE%;
            build plan:
              new liba/1.0.0 (required by bar)
                config.liba.x=true (set by bar)
              new libb/1.0.0 (required by bar)
              new bar/1.0.0
            fetched liba/1.0.0
            unpacked liba/1.0.0
            fetched libb/1.0.0
            unpacked libb/1.0.0
            fetched bar/1.0.0
            unpacked bar/1.0.0
            configured liba/1.0.0
            configured libb/1.0.0
            configured bar/1.0.0
            %info: .+bar.+ is up to date%
            updated bar/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !bar configured 1.0.0
              liba configured 1.0.0
              libb configured 1.0.0
            EOO

          cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.liba.x = true
            EOO

          $pkg_drop bar
        }

        : sys-liba-1
        :
        {
          $clone_cfg;

          $* bar '?sys:liba' 2>>~%EOE%;
            build plan:
              configure sys:liba/* (required by bar)
                config.liba.x=true (expected by bar)
              new libb/1.0.0 (required by bar)
              new bar/1.0.0
            fetched libb/1.0.0
            unpacked libb/1.0.0
            fetched bar/1.0.0
            unpacked bar/1.0.0
            configured sys:liba/*
            configured libb/1.0.0
            configured bar/1.0.0
            %info: .+bar.+ is up to date%
            updated bar/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !bar configured 1.0.0
              liba configured,system !* available 1.0.0
              libb configured 1.0.0
            EOO

          $pkg_drop bar
        }

        : sys-liba-2
        :
        {
          $clone_cfg;

          $* bar '?sys:liba' +{ config.liba.x=false } 2>>EOE != 0
            error: unable to negotiate acceptable configuration with dependent bar for dependencies liba
              info: configuration before negotiation:
                config.liba.x=false (user configuration)
            EOE
        }

        : bar-sys-liba-3
        :
        {
          $clone_cfg;

          $* bar '?sys:liba' +{ config.liba.x=[null] } 2>>EOE != 0
            error: unable to negotiate acceptable configuration with dependent bar for dependencies liba
              info: configuration before negotiation:
                config.liba.x=[null] (user configuration)
            EOE
        }

        : sys-liba-4
        :
        {
          $clone_cfg;

          $* bar '?sys:liba' +{ config.liba.x=true } 2>>~%EOE%;
            build plan:
              configure sys:liba/* (required by bar)
                config.liba.x=true (expected user configuration)
              new libb/1.0.0 (required by bar)
              new bar/1.0.0
            fetched libb/1.0.0
            unpacked libb/1.0.0
            fetched bar/1.0.0
            unpacked bar/1.0.0
            configured sys:liba/*
            configured libb/1.0.0
            configured bar/1.0.0
            %info: .+bar.+ is up to date%
            updated bar/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !bar configured 1.0.0
              liba configured,system !* available 1.0.0
              libb configured 1.0.0
            EOO

          $pkg_drop bar
        }
      }

      : baz
      :
      {
        +$clone_cfg

        : basic
        :
        {
          $clone_cfg;

          $* baz 2>>~%EOE%;
            build plan:
              new liba/1.0.0 (required by baz)
                config.liba.x=true (set by baz)
              new libb/1.0.0 (required by baz)
              new baz/1.0.0
            fetched liba/1.0.0
            unpacked liba/1.0.0
            fetched libb/1.0.0
            unpacked libb/1.0.0
            fetched baz/1.0.0
            unpacked baz/1.0.0
            configured liba/1.0.0
            configured libb/1.0.0
            configured baz/1.0.0
            %info: .+baz.+ is up to date%
            updated baz/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !baz configured 1.0.0
              liba configured 1.0.0
              libb configured 1.0.0
            EOO

          cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
            %.*
            config.liba.x = true
            EOO

          $pkg_drop baz
        }

        : sys-liba-1
        :
        {
          $clone_cfg;

          $* baz '?sys:liba' +{ config.liba.x=false } 2>>EOE != 0
            error: unable to negotiate configuration for system dependency liba without configuration information
              info: consider specifying system dependency version that has corresponding available package
              info: dependent baz has prefer/accept clauses that cannot be evaluated without configuration information
            EOE
        }

        : sys-liba-2
        :
        {
          $clone_cfg;

          $* baz '?sys:liba/1.0.0' 2>>~%EOE%;
            build plan:
              configure sys:liba/1.0.0 (required by baz)
                config.liba.x=true (expected by baz)
              new libb/1.0.0 (required by baz)
              new baz/1.0.0
            fetched libb/1.0.0
            unpacked libb/1.0.0
            fetched baz/1.0.0
            unpacked baz/1.0.0
            configured sys:liba/1.0.0
            configured libb/1.0.0
            configured baz/1.0.0
            %info: .+baz.+ is up to date%
            updated baz/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !baz configured 1.0.0
              liba configured,system !1.0.0
              libb configured 1.0.0
            EOO

          $pkg_drop baz
        }

        : sys-liba-3
        :
        {
          $clone_cfg;

          $* baz '?sys:liba/1.0.0' +{ config.liba.x=false } 2>>EOE != 0
            error: unable to negotiate acceptable configuration with dependent baz for dependencies liba
              info: configuration before negotiation:
                config.liba.x=false (user configuration)
            EOE
        }

        : bar-sys-liba-4
        :
        {
          $clone_cfg;

          $* baz '?sys:liba/1.0.0' +{ config.liba.x=[null] } 2>>EOE != 0
            <depends-accept-clause>:1: error: invalid bool value: null
              info: accept condition: ($config.liba.x)
              info: in depends manifest value of package baz
            EOE
        }

        : sys-liba-5
        :
        {
          $clone_cfg;

          $* baz '?sys:liba/1.0.0' +{ config.liba.x=true } 2>>~%EOE%;
            build plan:
              configure sys:liba/1.0.0 (required by baz)
                config.liba.x=true (expected user configuration)
              new libb/1.0.0 (required by baz)
              new baz/1.0.0
            fetched libb/1.0.0
            unpacked libb/1.0.0
            fetched baz/1.0.0
            unpacked baz/1.0.0
            configured sys:liba/1.0.0
            configured libb/1.0.0
            configured baz/1.0.0
            %info: .+baz.+ is up to date%
            updated baz/1.0.0
            EOE

          $pkg_status -r >>EOO;
            !baz configured 1.0.0
              liba configured,system !1.0.0
              libb configured 1.0.0
            EOO

          $pkg_drop baz
        }
      }
    }

    : proj-require-basics
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13m && $rep_fetch

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
              config.liba.x=true (set by bar)
            new bar/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.y = false
          config.liba.n = 1024
          EOO

        $pkg_drop bar
      }

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar, baz)
          %(
              config.liba.y=true (set by baz)
              config.liba.x=true (set by bar)
          %|
              config.liba.x=true (set by bar)
              config.liba.y=true (set by baz)
          %)
            new bar/1.0.0 (required by baz)
            new baz/1.0.0
              config.baz.bar=true (set by baz)
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            bar configured 1.0.0
              liba configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/liba-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.liba.x = true
          config.liba.y = true
          config.liba.n = 1024
          EOO

        cat cfg/baz-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.baz.bar = true
          EOO

        $pkg_drop baz
      }

      : biz
      :
      {
        $clone_cfg;

        $* biz 2>>EOE != 0
          error: configuration variable config.liba.x is not set to true
            info: config.liba.x set in require clause of dependent biz
            info: require clause:
              config.liba.x = false # Error: not true
            info: in depends manifest value of package biz
          EOE
      }

      : bix
      :
      {
        $clone_cfg;

        $* bix 2>>EOE != 0
          error: configuration variable config.liba.n is not of bool type
            info: config.liba.n set in require clause of dependent bix
            info: require clause:
              config.liba.n = 1    # Error: not bool
            info: in depends manifest value of package bix
          EOE
      }

      : box
      :
      {
        $clone_cfg;

        $* box 2>>EOE != 0
          error: package liba has no configuration variable config.liba.z
            info: config.liba.z set in require clause of dependent box
            info: require clause:
              config.liba.z = true # Error: no such variable
            info: in depends manifest value of package box
          EOE
      }
    }

    : proj-reflect-append
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13n && $rep_fetch

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new libb/1.0.0 (required by bar)
            new bar/1.0.0
              config.bar.libs=liba libb (set by bar)
              config.bar.x=true (set by bar)
              config.bar.y=true (set by bar)
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched libb/1.0.0
          unpacked libb/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured libb/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
            libb configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.libs = liba libb
          EOO

        $pkg_drop bar
      }
    }

    : proj-reflect-override
    :
    {
      +$clone_root_cfg && $rep_add $rep/t13o && $rep_fetch

      : bar
      :
      {
        $clone_cfg;

        $* bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new bar/1.0.0
              config.bar.x=true (set by bar)
              config.bar.y=true (set by bar)
              config.bar.z=true (set by bar)
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.z = true
          EOO

        $pkg_drop bar
      }

      : bar-config-1
      :
      {
        $clone_cfg;

        $* config.bar.y=true -- bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new bar/1.0.0
              config.bar.y=true (user configuration)
              config.bar.x=true (set by bar)
              config.bar.z=true (set by bar)
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.z = true
          EOO

        $pkg_drop bar
      }

      : bar-config-2
      :
      {
        $clone_cfg;

        $* config.bar.y=false -- bar 2>>EOE != 0
          error: reflect variable config.bar.y overriden by user configuration
            info: reflect value: config.bar.y=true
            info: user value: config.bar.y=false
            info: reflect clause:
              config.bar.x = true
              config.bar.y = true
              if ($config.origin(config.bar.z) != 'override')
                config.bar.z = true
            info: in depends manifest value of package bar
          info: while satisfying bar/1.0.0
          EOE
      }

      : bar-config-3
      :
      {
        $clone_cfg;

        $* config.bar.z=false -- bar 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new bar/1.0.0
              config.bar.z=false (user configuration)
              config.bar.x=true (set by bar)
              config.bar.y=true (set by bar)
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          %info: .+bar.+ is up to date%
          updated bar/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bar configured 1.0.0
            liba configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.z = false
          EOO

        $pkg_drop bar
      }

      : baz
      :
      {
        $clone_cfg;

        $* baz 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new bar/1.0.0 (required by baz)
              config.bar.y=true (set by baz)
              config.bar.x=true (set by bar)
              config.bar.z=true (set by bar)
            new baz/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched baz/1.0.0
          unpacked baz/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured baz/1.0.0
          %info: .+baz.+ is up to date%
          updated baz/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !baz configured 1.0.0
            bar configured 1.0.0
              liba configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.z = true
          EOO

        $pkg_drop baz
      }

      : biz
      :
      {
        $clone_cfg;

        $* biz 2>>EOE != 0
          error: reflect variable config.bar.y overriden by dependent biz
            info: reflect value: config.bar.y=true
            info: dependent value: config.bar.y=false
            info: reflect clause:
              config.bar.x = true
              config.bar.y = true
              if ($config.origin(config.bar.z) != 'override')
                config.bar.z = true
            info: in depends manifest value of package bar
          info: while satisfying bar/1.0.0
          EOE
      }

      : biz-bar
      :
      {
        $clone_cfg;

        $* biz ?bar +{ config.bar.y=false } 2>>EOE != 0
          error: reflect variable config.bar.y overriden by user configuration
            info: reflect value: config.bar.y=true
            info: user value: config.bar.y=false
            info: reflect clause:
              config.bar.x = true
              config.bar.y = true
              if ($config.origin(config.bar.z) != 'override')
                config.bar.z = true
            info: in depends manifest value of package bar
          info: while satisfying bar/1.0.0
          EOE
      }

      : bix
      :
      {
        $clone_cfg;

        $* bix 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new bar/1.0.0 (required by bix)
              config.bar.z=false (set by bix)
              config.bar.x=true (set by bar)
              config.bar.y=true (set by bar)
            new bix/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched bix/1.0.0
          unpacked bix/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured bix/1.0.0
          %info: .+bix.+ is up to date%
          updated bix/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bix configured 1.0.0
            bar configured 1.0.0
              liba configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.z = false
          EOO

        $pkg_drop bix
      }

      : bix-bar
      :
      {
        $clone_cfg;

        $* bix ?bar +{ config.bar.z=false } 2>>~%EOE%;
          build plan:
            new liba/1.0.0 (required by bar)
            new bar/1.0.0 (required by bix)
              config.bar.z=false (user configuration)
              config.bar.x=true (set by bar)
              config.bar.y=true (set by bar)
            new bix/1.0.0
          fetched liba/1.0.0
          unpacked liba/1.0.0
          fetched bar/1.0.0
          unpacked bar/1.0.0
          fetched bix/1.0.0
          unpacked bix/1.0.0
          configured liba/1.0.0
          configured bar/1.0.0
          configured bix/1.0.0
          %info: .+bix.+ is up to date%
          updated bix/1.0.0
          EOE

        $pkg_status -r >>EOO;
          !bix configured 1.0.0
            bar configured 1.0.0
              liba configured 1.0.0
          EOO

        cat cfg/bar-1.0.0/build/config.build >>~%EOO%;
          %.*
          config.bar.x = true
          config.bar.y = true
          config.bar.z = false
          EOO

        $pkg_drop bix
      }
    }
  }
}

: test-dependency
:
{
  +$clone_cfg
  +$rep_add $rep/t10 && $rep_fetch

  : simultaneously
  :
  {
    $clone_cfg;

    $* libfoo-bar libfoo-tests 2>>~%EOE%;
      fetched libfoo-bar/1.0.0
      unpacked libfoo-bar/1.0.0
      fetched libfoo-tests/1.0.0
      unpacked libfoo-tests/1.0.0
      configured libfoo-bar/1.0.0
      configured libfoo-tests/1.0.0
      %info: .+libfoo-bar-1.0.0.+ is up to date%
      %info: .+libfoo-tests-1.0.0.+ is up to date%
      updated libfoo-bar/1.0.0
      updated libfoo-tests/1.0.0
      EOE

    cat cfg/libfoo-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libfoo_tests.test = libfoo-bar
      %.*
      EOO

    $pkg_drop libfoo-bar libfoo-tests
  }

  : sequentially
  :
  {
    $clone_cfg;

    $* libfoo-baz 2>>~%EOE%;
      fetched libfoo-baz/1.0.0
      unpacked libfoo-baz/1.0.0
      configured libfoo-baz/1.0.0
      %info: .+libfoo-baz-1.0.0.+ is up to date%
      updated libfoo-baz/1.0.0
      EOE

    $* libfoo-tests 2>>~%EOE%;
      fetched libfoo-tests/1.0.0
      unpacked libfoo-tests/1.0.0
      configured libfoo-tests/1.0.0
      %info: .+libfoo-tests-1.0.0.+ is up to date%
      updated libfoo-tests/1.0.0
      EOE

    cat cfg/libfoo-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libfoo_tests.test = libfoo-baz
      %.*
      EOO

    $pkg_drop libfoo-baz libfoo-tests
  }

  : tests-only
  :
  {
    $clone_cfg;

    $* libfoo-tests 2>>~%EOE% != 0
      error: unable to select dependency alternative for package libfoo-tests/1.0.0
        info: explicitly specify dependency packages to manually select the alternative
        info: alternative: libfoo-bar
        info: alternative: libfoo-baz
      info: while satisfying libfoo-tests/1.0.0
      EOE
  }

  : reflection-foo
  :
  {
    $clone_cfg;

    $* libbar-tests 2>>EOE != 0;
      error: unable to select dependency alternative for package libbar-tests/1.0.0
        info: explicitly specify dependency packages to manually select the alternative
        info: alternative: libbar-baz
        info: alternative: libbar-foo
      info: while satisfying libbar-tests/1.0.0
      EOE

    $* libbar-foo libbar-tests 2>>~%EOE%;
      fetched libbar-foo/1.0.0
      unpacked libbar-foo/1.0.0
      fetched libbar-tests/1.0.0
      unpacked libbar-tests/1.0.0
      configured libbar-foo/1.0.0
      configured libbar-tests/1.0.0
      %info: .+libbar-foo-1.0.0.+ is up to date%
      %info: .+libbar-tests-1.0.0.+ is up to date%
      updated libbar-foo/1.0.0
      updated libbar-tests/1.0.0
      EOE

    cat cfg/libbar-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libbar_tests.test = libbar-foo
      %.*
      EOO

    $* libbar-baz 2>>~%EOE%;
      fetched libbar-baz/1.0.0
      unpacked libbar-baz/1.0.0
      configured libbar-baz/1.0.0
      %info: .+libbar-baz-1.0.0.+ is up to date%
      updated libbar-baz/1.0.0
      EOE

    cat cfg/libbar-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libbar_tests.test = libbar-foo
      %.*
      EOO

    $pkg_status -r >>EOO;
      !libbar-foo configured 1.0.0
      !libbar-tests configured 1.0.0
        !libbar-foo configured 1.0.0
      !libbar-baz configured 1.0.0
      EOO

    $pkg_drop libbar-foo libbar-baz libbar-tests
  }

  : reflection-baz
  :
  {
    $clone_cfg;

    $* libbar-baz libbar-tests 2>>~%EOE%;
      fetched libbar-baz/1.0.0
      unpacked libbar-baz/1.0.0
      fetched libbar-tests/1.0.0
      unpacked libbar-tests/1.0.0
      configured libbar-baz/1.0.0
      configured libbar-tests/1.0.0
      %info: .+libbar-baz-1.0.0.+ is up to date%
      %info: .+libbar-tests-1.0.0.+ is up to date%
      updated libbar-baz/1.0.0
      updated libbar-tests/1.0.0
      EOE

    cat cfg/libbar-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libbar_tests.test = libbar-baz
      %.*
      EOO

    $* libbar-foo 2>>~%EOE%;
      fetched libbar-foo/1.0.0
      unpacked libbar-foo/1.0.0
      configured libbar-foo/1.0.0
      %info: .+libbar-foo-1.0.0.+ is up to date%
      updated libbar-foo/1.0.0
      EOE

    cat cfg/libbar-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libbar_tests.test = libbar-baz
      %.*
      EOO

    $pkg_status -r >>EOO;
      !libbar-baz configured 1.0.0
      !libbar-tests configured 1.0.0
        !libbar-baz configured 1.0.0
      !libbar-foo configured 1.0.0
      EOO

    $pkg_drop libbar-baz libbar-foo libbar-tests
  }

  : reflection-both
  :
  {
    $clone_cfg;

    $* libbar-foo libbar-baz libbar-tests 2>!;

    cat cfg/libbar-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libbar_tests.test = libbar-baz
      %.*
      EOO

    $pkg_status -r >>EOO;
      !libbar-foo configured 1.0.0
      !libbar-baz configured 1.0.0
      !libbar-tests configured 1.0.0
        !libbar-baz configured 1.0.0
      EOO

    $pkg_drop libbar-foo libbar-baz libbar-tests
  }

  : configure-explicit
  :
  {
    $clone_cfg;

    $* --yes "config.libbar_tests.test = libbar-foo libbar-baz" -- libbar-tests 2>!;

    cat cfg/libbar-tests-1.0.0/build/config.build >>~%EOO%;
      %.*
      config.libbar_tests.test = libbar-foo libbar-baz
      %.*
      EOO

    $pkg_status -r >>EOO;
      !libbar-tests configured 1.0.0
        libbar-baz configured 1.0.0
        libbar-foo configured 1.0.0
      EOO

    $pkg_drop libbar-tests
  }
}

: dependent
:
{
  +$clone_cfg
  +$rep_add $rep/t2 && $rep_fetch

  : update
  :
  : Test --update-dependent option.
  :
  {
    $clone_cfg;

    $* --yes libbar 2>>~%EOE%;
      fetched libfoo/1.0.0
      unpacked libfoo/1.0.0
      fetched libbar/1.0.0
      unpacked libbar/1.0.0
      configured libfoo/1.0.0
      configured libbar/1.0.0
      %info: .+ is up to date%
      updated libbar/1.0.0
      EOE

    $rep_add $rep/t4a && $rep_fetch;

    $* --update-dependent libfoo/1.1.0 <'y' 2>>~%EOE%;
        upgrade libfoo/1.1.0
        reconfigure libbar (dependent of libfoo)
      continue? [Y/n] disfigured libbar/1.0.0
      disfigured libfoo/1.0.0
      fetched libfoo/1.1.0
      unpacked libfoo/1.1.0
      configured libfoo/1.1.0
      configured libbar/1.0.0
      %info: .+ is up to date%{2}
      updated libfoo/1.1.0
      updated libbar/1.0.0
      EOE

    $pkg_disfigure libbar 2>'disfigured libbar/1.0.0';
    $pkg_purge     libbar 2>'purged libbar/1.0.0';

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }

  : leave
  :
  : Test --leave-dependent option.
  :
  {
    $clone_cfg;

    $* --yes libbar 2>>~%EOE%;
      fetched libfoo/1.0.0
      unpacked libfoo/1.0.0
      fetched libbar/1.0.0
      unpacked libbar/1.0.0
      configured libfoo/1.0.0
      configured libbar/1.0.0
      %info: .+ is up to date%
      updated libbar/1.0.0
      EOE

    $rep_add $rep/t4a && $rep_fetch;

    $* --leave-dependent libfoo/1.1.0 <'y' 2>>~%EOE%;
        upgrade libfoo/1.1.0
        reconfigure libbar (dependent of libfoo)
      continue? [Y/n] disfigured libbar/1.0.0
      disfigured libfoo/1.0.0
      fetched libfoo/1.1.0
      unpacked libfoo/1.1.0
      configured libfoo/1.1.0
      configured libbar/1.0.0
      %info: .+ is up to date%
      updated libfoo/1.1.0
      EOE

    $pkg_disfigure libbar 2>'disfigured libbar/1.0.0';
    $pkg_purge     libbar 2>'purged libbar/1.0.0';

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }
}

: dependency-cycle
:
{
  test.arguments += --yes

  +$cfg_create cxx $config_cxx -d cfg &cfg/***

  : direct
  :
  {
    $clone_cfg;

    cp -r $src/libfoo-1.1.0/ libfoo;
    echo "depends: libfoo" >+ libfoo/manifest;
    $rep_add libfoo --type dir;

    $rep_fetch;

    $* libfoo 2>>EOE != 0
      error: dependency cycle detected involving package libfoo
        info: libfoo/1.1.0 depends on libfoo/1.1.0
      EOE
  }

  : direct-config
  :
  : As above but with a linked configuration.
  :
  {
    $clone_cfg;
    $cfg_create -d cfg2 &cfg2/***;
    $cfg_link -d cfg cfg2;

    cp -r $src/libfoo-1.1.0/ libfoo;
    echo "depends: libfoo" >+ libfoo/manifest;
    $rep_add libfoo --type dir -d cfg2;

    $rep_fetch -d cfg2;

    $* libfoo +{ --config-id 1 } 2>>~%EOE% != 0
      %error: dependency cycle detected involving package libfoo \[cfg2.\]%
      %  info: libfoo/1.1.0 \[cfg2.\] depends on libfoo/1.1.0 \[cfg2.\]%
      EOE
  }

  : indirect
  :
  {
    +$clone_cfg

    : new
    :
    {
      $clone_cfg;

      cp -r $src/libfoo-1.1.0/ libfoo;
      echo "depends: libbar" >+ libfoo/manifest;

      cat <<"EOI" >=libfoo/repositories.manifest;
        : 1
        summary: libfoo project repository

        :
        role: prerequisite
        location: $rep/t0b
        EOI

      $rep_add libfoo --type dir;

      $rep_fetch;

      $* libfoo 2>>EOE != 0
        error: dependency cycle detected involving package libfoo
          info: libfoo/1.1.0 depends on libbar/0.0.2
          info: libbar/0.0.2 depends on libbaz/0.0.2
          info: libbaz/0.0.2 depends on libfoo/1.1.0
        EOE
    }

    : upgrade
    :
    {
      $clone_cfg;

      cp -r $src/libfoo-1.1.0/ libfoo;
      $rep_add libfoo --type dir;

      cp -r $src/libhello-1.0.0/ libhello;
      echo "depends: libfoo" >+ libhello/manifest;
      $rep_add libhello --type dir;

      $rep_fetch;

      $* libhello 2>>~%EOE%;
        using libfoo/1.1.0 (external)
        using libhello/1.0.0 (external)
        configured libfoo/1.1.0
        configured libhello/1.0.0
        %(mkdir|c\+\+|ld|ar) .+%{8}
        updated libhello/1.0.0
        EOE

      echo "depends: libhello" >+ libfoo/manifest;
      sed -i -e 's/(version: 1.1).0/\1.1/' libfoo/manifest;

      $rep_fetch;

      $* ?libfoo 2>>EOE != 0;
        error: dependency cycle detected involving package libfoo
          info: libfoo/1.1.1 depends on libhello/1.0.0
          info: libhello/1.0.0 depends on libfoo/1.1.1
        EOE

      $pkg_drop libhello
    }
  }
}

: config-vars
:
{
  test.arguments += --yes

  +$cfg_create cxx $config_cxx -d cfg &cfg/***
  +cp -r $src/libhello-1.0.0 ./libhello
  +$rep_add libhello --type dir
  +$rep_fetch

  : global-and-local
  :
  {
    $clone_cfg;

    $* config.cxx.poptions=-DG -- libhello +{ config.cxx.poptions+=-DL } 2>>~%EOE%;
      using libhello/1.0.0 (external)
      configured libhello/1.0.0
      %(mkdir|c\+\+|ar|ld) .+%{8}
      updated libhello/1.0.0
      EOE

    cat cfg/libhello/build/config.build >>~%EOO%;
      %.*
      config.cxx.poptions = -DG -DL
      EOO

    $pkg_drop libhello
  }

  : global-and-options
  :
  {
    $clone_cfg;

    $* config.cxx.poptions=-DG --fetch-timeout=60 -- libhello 2>>~%EOE%;
      using libhello/1.0.0 (external)
      configured libhello/1.0.0
      %(mkdir|c\+\+|ar|ld) .+%{8}
      updated libhello/1.0.0
      EOE

    cat cfg/libhello/build/config.build >>~%EOO%;
      %.*
      config.cxx.poptions = -DG
      EOO

    $pkg_drop libhello
  }
}

: patch
:
{
  test.arguments += --configure-only --yes

  +$clone_root_cfg

  : held
  :
  {
    +$clone_cfg
    +$rep_fetch $rep/t0c

    : success
    :
    {
      $clone_cfg;

      $* libbaz/0.0.3 2>!;

      $* libbaz --patch 2>>EOE;
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbaz/0.0.4
        unpacked libbaz/0.0.4
        configured libbaz/0.0.4
        EOE

      $pkg_drop libbaz
    }

    : ignore
    :
    {
      $clone_cfg;

      $* libbaz/0.0.3 --patch 2>>EOE;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbaz/0.0.3
        unpacked libbaz/0.0.3
        configured libfoo/1.0.0
        configured libbaz/0.0.3
        EOE

      $* libbaz/0.1.0 --patch 2>>EOE;
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbaz/0.1.0
        unpacked libbaz/0.1.0
        configured libbaz/0.1.0
        EOE

      $pkg_drop libbaz
    }

    : warn
    :
    {
      $clone_cfg;

      $* 'sys:libbaz/0.0.3-alpha' 2>!;

      $* libbaz --patch 2>>EOE;
        warning: unable to patch libbaz/0.0.3-alpha
          info: package is not using semantic/standard version
        info: nothing to build
        EOE

      $pkg_drop libbaz
    }
  }

  : dependency
  :
  {
    +$clone_cfg
    +$rep_fetch $rep/t0c

    +$* libbox libfix ?libbaz/0.0.3 2>>EOE
       fetched libfoo/1.0.0
       unpacked libfoo/1.0.0
       fetched libbaz/0.0.3
       unpacked libbaz/0.0.3
       fetched libbox/0.0.1
       unpacked libbox/0.0.1
       fetched libfix/0.0.3
       unpacked libfix/0.0.3
       configured libfoo/1.0.0
       configured libbaz/0.0.3
       configured libbox/0.0.1
       configured libfix/0.0.3
       EOE

    clone_cfg = [cmdline] cp --no-cleanup -r ../cfg ./ &cfg/***

    : explicitly
    :
    : Here we also test that the package --path option overrides the global
    : --upgrade option.
    :
    {
      $clone_cfg;

      $* ?libbaz +{ --patch } --upgrade 2>>EOE
        disfigured libbox/0.0.1
        disfigured libfix/0.0.3
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbaz/0.0.4
        unpacked libbaz/0.0.4
        configured libbaz/0.0.4
        configured libfix/0.0.3
        configured libbox/0.0.1
        EOE
    }

    : warn
    :
    {
      $clone_cfg;

      $* '?sys:libbaz/0.0.4-alpha' 2>!;

      $* ?libbaz --patch 2>>EOE
        warning: unable to patch libbaz/0.0.4-alpha
          info: package is not using semantic/standard version
        EOE
    }

    : recursive
    :
    {
      $clone_cfg;

      $* --patch --recursive 2>>EOE
        disfigured libfix/0.0.3
        disfigured libbox/0.0.1
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbaz/0.0.4
        unpacked libbaz/0.0.4
        configured libbaz/0.0.4
        configured libbox/0.0.1
        configured libfix/0.0.3
        EOE
    }

    : upgrade-wins-patch
    :
    : Test that --upgrade options wins --patch.
    :
    {
      $clone_cfg;

      $* libbox +{ --upgrade-immediate } libfix +{ --patch-immediate } 2>>EOE
        disfigured libfix/0.0.3
        disfigured libbox/0.0.1
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbaz/0.1.0
        unpacked libbaz/0.1.0
        configured libbaz/0.1.0
        configured libbox/0.0.1
        configured libfix/0.0.3
        EOE
    }

    : unavailable
    :
    {
      $clone_cfg;

      $* '?sys:libbaz/0.0.3' 2>>EOE;
        disfigured libbox/0.0.1
        disfigured libfix/0.0.3
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        purged libbaz/0.0.3
        configured sys:libbaz/0.0.3
        configured libfix/0.0.3
        configured libbox/0.0.1
        EOE

      $rep_remove $rep/t0c;
      $rep_fetch $rep/t0b;

      $* ?libbaz --patch --yes 2>>EOE != 0
        error: patch version for sys:libbaz/0.0.3 is not available from its dependents' repositories
        EOE
    }

    : unavailable-masked
    :
    : As above but using --mask-repository instead of rep-remove.
    :
    {
      $clone_cfg;

      $* '?sys:libbaz/0.0.3' 2>>EOE;
        disfigured libbox/0.0.1
        disfigured libfix/0.0.3
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        purged libbaz/0.0.3
        configured sys:libbaz/0.0.3
        configured libfix/0.0.3
        configured libbox/0.0.1
        EOE

      $rep_fetch $rep/t0b;

      $* --mask-repository $rep/t0c ?libbaz --patch --yes 2>>EOE != 0
        error: patch version for sys:libbaz/0.0.3 is not available from its dependents' repositories
        EOE
    }

    -$pkg_drop libbox libfix libbaz libfoo
  }

  : from-repository
  :
  {
    test.arguments += --patch --auth all --trust-yes

    +$clone_cfg

    +$* "libbaz/0.0.3@$rep/t0c" 2>>EOE
      added pkg:build2.org/pkg-build/t0c
      fetching pkg:build2.org/pkg-build/t0c
      fetched libfoo/1.0.0
      unpacked libfoo/1.0.0
      fetched libbaz/0.0.3
      unpacked libbaz/0.0.3
      configured libfoo/1.0.0
      configured libbaz/0.0.3
      EOE

    clone_cfg = [cmdline] cp --no-cleanup -r ../cfg ./ &cfg/***

    : explicit
    :
    {
      $clone_cfg;

      $* "libbaz@$rep/t0c" 2>>EOE
        fetching pkg:build2.org/pkg-build/t0c
        disfigured libbaz/0.0.3
        disfigured libfoo/1.0.0
        purged libfoo/1.0.0
        fetched libbaz/0.0.4
        unpacked libbaz/0.0.4
        configured libbaz/0.0.4
        EOE
    }

    : implicit
    :
    : Note that libfoo also becomes held.
    :
    {
      $clone_cfg;

      $* "@$rep/t0c" 2>>EOE;
        fetching pkg:build2.org/pkg-build/t0c
        info: package libbar is not present in configuration
        info: package libbox is not present in configuration
        info: package libfix is not present in configuration
        disfigured libbaz/0.0.3
        fetched libbaz/0.0.4
        unpacked libbaz/0.0.4
        configured libbaz/0.0.4
        EOE

      $pkg_status libfoo >'!libfoo configured !1.0.0'
    }

    -$pkg_drop libbaz libfoo
  }
}

: configure-only
:
: Test --configure-only option.
:
{
  $clone_cfg;
  $rep_add $rep/t2 && $rep_fetch;

  $* --configure-only --yes libbar 2>>EOE;
    fetched libfoo/1.0.0
    unpacked libfoo/1.0.0
    fetched libbar/1.0.0
    unpacked libbar/1.0.0
    configured libfoo/1.0.0
    configured libbar/1.0.0
    EOE

  $pkg_disfigure libbar 2>'disfigured libbar/1.0.0';
  $pkg_purge     libbar 2>'purged libbar/1.0.0';

  $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
  $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
}

: repository-location
:
{
  test.arguments += --yes --auth all --trust-yes

  : all-packages
  :
  {
    : explicit
    :
    {
      $clone_root_cfg;

      $* "@$rep/t4d" 2>>~%EOE%;
        %.+
        %info: .+ is up to date%{2}
        updated libfox/1.0.0
        updated libbiz/1.0.0
        EOE

      $pkg_disfigure libbiz 2>'disfigured libbiz/1.0.0';
      $pkg_purge     libbiz 2>'purged libbiz/1.0.0';

      $pkg_disfigure libfox 2>'disfigured libfox/1.0.0';
      $pkg_purge     libfox 2>'purged libfox/1.0.0';

      $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
      $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
      $pkg_purge     libbar 2>'purged libbar/1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }

    : url-detection
    :
    {
      $clone_root_cfg;

      if! $remote
        rep = ($posix \
               ? "file:$rep" \
               : "file:/$regex.replace($rep, '\\', '/')")

        rep = "$regex.replace($rep, ' ', '%20')"
      end;

      $* "$rep/t4d" 2>>~%EOE%;
        %.+
        %info: .+ is up to date%{2}
        updated libfox/1.0.0
        updated libbiz/1.0.0
        EOE

      $pkg_disfigure libbiz 2>'disfigured libbiz/1.0.0';
      $pkg_purge     libbiz 2>'purged libbiz/1.0.0';

      $pkg_disfigure libfox 2>'disfigured libfox/1.0.0';
      $pkg_purge     libfox 2>'purged libfox/1.0.0';

      $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
      $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

      $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
      $pkg_purge     libbar 2>'purged libbar/1.1.0';

      $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
      $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
    }
  }

  : multiple-packages
  :
  {
    $clone_root_cfg;

    $* "libfox,libbiz/1.0.0@$rep/t4d" 2>>~%EOE%;
      %.+
      %info: .+ is up to date%{2}
      updated libfox/1.0.0
      updated libbiz/1.0.0
      EOE

    $pkg_disfigure libbiz 2>'disfigured libbiz/1.0.0';
    $pkg_purge     libbiz 2>'purged libbiz/1.0.0';

    $pkg_disfigure libfox 2>'disfigured libfox/1.0.0';
    $pkg_purge     libfox 2>'purged libfox/1.0.0';

    $pkg_disfigure libbaz 2>'disfigured libbaz/1.1.0';
    $pkg_purge     libbaz 2>'purged libbaz/1.1.0';

    $pkg_disfigure libbar 2>'disfigured libbar/1.1.0';
    $pkg_purge     libbar 2>'purged libbar/1.1.0';

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }

  : version
  :
  : Test that libfoo/0.0.1 package version is built (repository t0a), rather
  : than libfoo/1.0.0 (repository t4a).
  :
  {
    $clone_root_cfg;

    $rep_fetch $rep/t4c 2>!;

    $* "libfoo@$rep/t0a" 2>>~%EOE%;
      %.+
      configured libfoo/0.0.1
      %info: .+ is up to date%
      updated libfoo/0.0.1
      EOE

    $pkg_drop libfoo
  }

  : no-patch
  :
  : Here we also test that --patch options is ignored if there is no selected
  : package in the configuration.
  :
  {
    $clone_root_cfg;

    $* "libfoo@$rep/t1" --patch 2>>~%EOE%;
      %.+
      configured libfoo/1.0.0
      %info: .+ is up to date%
      updated libfoo/1.0.0
      EOE

    $* "libfoo@$rep/t3" --patch 2>>~%EOE% != 0;
      %.+
      error: patch version for libfoo/1.0.0 is not found in pkg:build2.org/pkg-build/t3
      EOE

    $pkg_drop libfoo
  }

  : no-patch-config
  :
  : As above but with a linked configuration.
  :
  {
    $clone_root_cfg;
    $cfg_create -d cfg2 &cfg2/***;
    $cfg_link -d cfg cfg2;

    $* "libfoo@$rep/t1" +{ --config-id 1 } --patch 2>>~%EOE%;
      %.+
      %configured libfoo/1.0.0 \[cfg2.\]%
      %info: .+ is up to date%
      %updated libfoo/1.0.0 \[cfg2.\]%
      EOE

    $* "libfoo@$rep/t3" +{ --config-id 1 } --patch 2>>~%EOE% != 0;
      %.+
      %error: patch version for libfoo/1.0.0 \[cfg2.\] is not found in pkg:build2.org/pkg-build/t3%
      EOE

    $pkg_drop -d cfg2 libfoo
  }

  : package-in-complement
  :
  {
    $clone_root_cfg;

    $* "libfoo@$rep/t4d" 2>>~%EOE%;
      %.+
      %info: .+ is up to date%
      updated libfoo/1.0.0
      EOE

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.0.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.0.0'
  }

  : system
  :
  {
    $clone_root_cfg;

    $* "sys:libbiz/2.0.0@$rep/t4d" 2>>~%EOE%;
      %.+
      configured sys:libbiz/2.0.0
      EOE

    $pkg_disfigure libbiz 2>'purged libbiz/2.0.0'
  }

  : non-existent-package
  :
  {
    $clone_root_cfg;

    $* "libbar@$rep/t4d" 2>>~%EOE% != 0
      %.+
      error: package libbar is not found in pkg:build2.org/pkg-build/t4d or its complements
      EOE
  }

  : location-search
  :
  : Test that the repository location is searched in the database before being
  : parsed. The latest would fail as the repository type would be misguessed.
  :
  {
    $clone_root_cfg;
    $rep_add $src/libfoo-1.1.0 --type dir && $rep_fetch;

    d = $canonicalize([dir_path] $src/libfoo-1.1.0);

    # Note that on Windows the local repository canonical name path part is
    # converted to lower case.
    #
    $* "libfoo@$d" 2>>~"%EOE%";
      fetching dir:($posix ? "$d" : $string.lcase("$d"))
      using libfoo/1.1.0 \(external\)
      configured libfoo/1.1.0
      %info: .+ is up to date%
      updated libfoo/1.1.0
      EOE

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }
}

: dir-rep
:
{
  : preferred
  :
  : Test that dir (local) repository is preferred over non-dir local repository
  : that comes first.
  :
  {
    $clone_root_cfg;
    $rep_fetch $rep/t4a;
    $rep_add $src/libfoo-1.1.0 --type dir;

    d = $canonicalize([dir_path] $src/libfoo-1.1.0);

    if! $posix
      d = [dir_path] $string.lcase($d)
    end;

    $rep_fetch "dir:$d";

    $* libfoo 2>>~%EOE%;
      using libfoo/1.1.0 (external)
      configured libfoo/1.1.0
      %info: .+ is up to date%
      updated libfoo/1.1.0
      EOE

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     libfoo 2>'purged libfoo/1.1.0'
  }

  : preferred-config
  :
  : As above but with a linked configuration.
  :
  {
    $clone_root_cfg;

    $cfg_create -d cfg2 &cfg2/***;
    $cfg_link -d cfg cfg2;

    $rep_fetch -d cfg2 $rep/t4a;
    $rep_add -d cfg2 $src/libfoo-1.1.0 --type dir;

    d = $canonicalize([dir_path] $src/libfoo-1.1.0);

    if! $posix
      d = [dir_path] $string.lcase($d)
    end;

    $rep_fetch -d cfg2 "dir:$d";

    $* libfoo +{ --config-id 1 } 2>>~%EOE%;
      %using libfoo/1.1.0 \[cfg2.\] \(external\)%
      %configured libfoo/1.1.0 \[cfg2.\]%
      %info: .+ is up to date%
      %updated libfoo/1.1.0 \[cfg2.\]%
      EOE

    $pkg_disfigure -d cfg2 libfoo 2>'disfigured libfoo/1.1.0';
    $pkg_purge     -d cfg2 libfoo 2>'purged libfoo/1.1.0'
  }
}

: disfigure
:
{
  +$cfg_create cxx $config_cxx -d cfg &cfg/***

  # Build libhello as an external package.
  #
  +cp -r $src/libhello-1.0.0 ./libhello
  +cat <<EOI >+libhello/build/root.build
    config [bool] config.libhello.develop ?= false
    config [bool] config.libhello.extras ?= false
    if ($build.mode != 'skeleton')
      text "develop=$config.libhello.develop"
    EOI
  +$rep_add libhello --type dir
  +$rep_fetch
  +$* config.libhello.develop=true -- libhello 2>!

  : without
  :
  : Make sure without --disfigure old configuration is preserved.
  :
  {
    $clone_cfg;
    $* libhello 2>!; # Update after output directory change.

    # Specify a configuration variable to trigger reconfiguration.
    #
    $* config.libhello.extras=true -- libhello 2>>~%EOE%
        disfigured libhello/1.0.0
        %.*: develop=true%
        configured libhello/1.0.0
        %.*: develop=true%
        %(mkdir|c\+\+|ld|ar) .+%{8}
        updated libhello/1.0.0
        EOE
  }

  : alone
  :
  : Make sure --disfigure alone causes reconfiguration.
  :
  {
    $clone_cfg;
    $* libhello 2>!; # Update after output directory change.

    $* --disfigure libhello 2>>~%EOE%
        disfigured libhello/1.0.0
        %.*: develop=false%
        configured libhello/1.0.0
        %.*: develop=false%
        %(mkdir|c\+\+|ld|ar) .+%{8}
        updated libhello/1.0.0
        EOE
  }

  : with-keep-out
  :
  {
    $clone_cfg;
    $* libhello 2>!; # Update after output directory change.

    $* --disfigure --keep-out libhello 2>>~%EOE%
        disfigured libhello/1.0.0
        %.*: develop=false%
        configured libhello/1.0.0
        %.*: develop=false%
        %info: .+ is up to date%
        updated libhello/1.0.0
        EOE
  }
}

: keep-out
:
{
  +$cfg_create cxx $config_cxx -d cfg &cfg/***

  # Build libhello as an external package.
  #
  +cp -r $src/libhello-1.0.0 ./libhello
  +$rep_add libhello --type dir
  +$rep_fetch
  +$* libhello 2>!

  # Move libhello version ahead.
  #
  +sed -i -e 's/(version: 1.0).0/\1.1/' libhello/manifest
  +$rep_fetch

  test.arguments += --yes # Is a command-specific option.

  : unspecified
  :
  : Test that libhello is fully rebuilt.
  :
  {
    $clone_cfg;
    $rep_fetch;

    $* libhello 2>>~%EOE%
      disfigured libhello/1.0.0
      using libhello/1.0.1 (external)
      configured libhello/1.0.1
      %(mkdir|c\+\+|ld|ar) .+%{8}
      updated libhello/1.0.1
      EOE
  }

  : specified
  :
  {
    test.arguments += --keep-out

    +$clone_cfg

    : dir-repo
    :
    : Test that libhello is built incrementally. May re-link due to the
    : configuration copying.
    :
    {
      $clone_cfg;

      $* libhello 2>>~%EOE%;
        disfigured libhello/1.0.0
        using libhello/1.0.1 (external)
        configured libhello/1.0.1
        %(ld|ar) .+%*
        updated libhello/1.0.1
        EOE

      test -d cfg/libhello/;
      test -d cfg/libhello-1.0.1/ == 1
    }

    : directory
    :
    : Test that libhello is built incrementally. May re-link due to the
    : configuration copying.
    :
    {
      +$clone_cfg

      # To avoid 'external package is already available' failure for the
      # nested tests.
      #
      +$rep_remove --all

      : arg
      :
      {
        $clone_cfg;

        $* ../../../libhello/ 2>>~%EOE%;
          disfigured libhello/1.0.0
          using libhello/1.0.1 (external)
          configured libhello/1.0.1
          %(ld|ar) .+%*
          updated libhello/1.0.1
          EOE

        test -d cfg/libhello/;
        test -d cfg/libhello-1.0.1/ == 1
      }

      : unpacked
      :
      {
        $clone_cfg;
        $pkg_disfigure libhello --keep-out 2>!;
        $pkg_unpack --replace --existing ../../../libhello;

        $* libhello 2>>~%EOE%;
          configured libhello/1.0.1
          %(ld|ar) .+%*
          updated libhello/1.0.1
          EOE

        test -d cfg/libhello/;
        test -d cfg/libhello-1.0.1/ == 1
      }
    }

    : archive
    :
    : Test that libhello is fully rebuilt, as the resulted package is not
    : external.
    {
      clone_cfg = [cmdline] cp -pr --no-cleanup ../../cfg ./

      # Distribute using the dedicated configuration to avoid the 'c and cxx
      # module toolchain pattern mismatch' warning.
      #
      +$cfg_create cxx $config_cxx -d cfg &cfg/***

      +$build 'dist(../../libhello/@./cfg/libhello/)' \
              config.dist.root=./ \
              config.dist.archives=tar.gz 2>! \
              &libhello-1.0.1/*** &libhello-1.0.1.tar.gz

      : arg
      :
      {
        $clone_cfg;

        $* ../libhello-1.0.1.tar.gz 2>>~%EOE%;
          disfigured libhello/1.0.0
          fetched libhello/1.0.1
          unpacked libhello/1.0.1
          configured libhello/1.0.1
          %(c\+\+|ld|ar) .+%{6}
          updated libhello/1.0.1
          EOE

        test -d cfg/libhello-1.0.1/;
        test -d cfg/libhello/ == 1;

        $pkg_disfigure libhello 2>'disfigured libhello/1.0.1';
        $pkg_purge     libhello 2>'purged libhello/1.0.1';

        rm -r cfg/
      }

      : unpacked
      :
      {
        $clone_cfg;

        $pkg_disfigure libhello 2>!;
        $pkg_fetch --replace --existing ../libhello-1.0.1.tar.gz;
        $pkg_unpack libhello;

        $* libhello 2>>~%EOE%;
          configured libhello/1.0.1
          %(c\+\+|ld|ar) .+%{6}
          updated libhello/1.0.1
          EOE

        test -d cfg/libhello-1.0.1/;
        test -d cfg/libhello/ == 1;

        $pkg_disfigure libhello 2>'disfigured libhello/1.0.1';
        $pkg_purge     libhello 2>'purged libhello/1.0.1';

        rm -r cfg/
      }
    }
  }

  -$pkg_disfigure libhello 2>'disfigured libhello/1.0.0'
  -$pkg_purge     libhello 2>'purged libhello/1.0.0'
}

: iter
:
{
  test.arguments += --yes # Is a command-specific option.

  : already-available
  :
  {
    $clone_root_cfg;
    $rep_add $src/libfoo-1.1.0 --type dir && $rep_fetch;

    $* $src/libfoo-1.1.0/ 2>>~%EOE% != 0
      %error: external package libfoo/1.1.0 is already available from dir:.+libfoo-1.1.0%
      EOE
  }

  : upgrade
  :
  {
    $clone_root_cfg;

    $* $src/libfoo-1.1.0/ 2>>~%EOE%;
      using libfoo/1.1.0 (external)
      configured libfoo/1.1.0
      %info: .+ is up to date%
      updated libfoo/1.1.0
      EOE

    cp -pr $src/libfoo-1.1.0 libfoo;

    $* libfoo/ 2>>~%EOE%;
      disfigured libfoo/1.1.0
      using libfoo/1.1.0#1 (external)
      configured libfoo/1.1.0#1
      %info: .+ is up to date%
      updated libfoo/1.1.0#1
      EOE

    $rep_add $src/libfoo-1.1.0 --type dir && $rep_fetch;

    $* libfoo 2>>~%EOE%;
      disfigured libfoo/1.1.0#1
      using libfoo/1.1.0#2 (external)
      configured libfoo/1.1.0#2
      %info: .+ is up to date%
      updated libfoo/1.1.0#2
      EOE

    $pkg_disfigure libfoo 2>'disfigured libfoo/1.1.0#2'
  }
}

: ignore-case-pkg
:
{
  test.arguments += --yes --auth all --trust-yes

  $clone_cfg;

  $* "libbar@$rep/t5" 2>>~%EOE%;
    added pkg:build2.org/pkg-build/t5
    fetching pkg:build2.org/pkg-build/t5
    fetched libbar/1.2.0
    unpacked libbar/1.2.0
    configured libbar/1.2.0
    %info: .+ is up to date%
    updated libbar/1.2.0
    EOE

  $* "libbar@$rep/t6" 2>>~%EOE%;
    added pkg:build2.org/pkg-build/t6
    fetching pkg:build2.org/pkg-build/t6
    disfigured libbar/1.2.0
    fetched libBar/2.0.0
    unpacked libBar/2.0.0
    configured libBar/2.0.0
    %info: .+ is up to date%
    updated libBar/2.0.0
    EOE

  $pkg_status libbar >'!libBar configured !2.0.0';

  test -d cfg/libBar-2.0.0;

  $pkg_drop libbar
}

: ignore-case-rep
:
: Test that package spec local repository location is matched
: case-insensitively on Windows.
:
if (!$remote && !$posix)
{
  $clone_cfg;

  $* "libbar@$rep/t5" 2>>~%EOE%;
    added pkg:build2.org/pkg-build/t5
    fetching pkg:build2.org/pkg-build/t5
    fetched libbar/1.2.0
    unpacked libbar/1.2.0
    configured libbar/1.2.0
    %info: .+ is up to date%
    updated libbar/1.2.0
    EOE

  $* "libbar@$rep/T5" 2>>~%EOE%;
    fetching pkg:build2.org/pkg-build/t5
    %info: .+ is up to date%
    updated libbar/1.2.0
    EOE

  $rep_list >~'%pkg:build2\.org/pkg-build/t5 .+t5%';

  $pkg_drop libbar
}

: git-rep
:
if! $git_supported
{
  # Skip git repository tests.
  #
}
else
{
  rep0 = "$rep_git/state0"
  rep1 = "$rep_git/state1"

  test.arguments += --yes

  pkg_disfigure += 2>!
  pkg_purge     += 2>!

  : prerequisite-repo
  :
  : Dependency package of the dependent being built is in the prerequisite
  : repository.
  :
  {
    $clone_root_cfg;
    $rep_add "$rep0/libbar.git#master";
    $rep_add "$rep0/style-basic.git#master";
    $rep_fetch &cfg/.bpkg/repos/*/***;

    $* libmbar 2>>~%EOE%;
      %checked out style-basic/.+%
      checked out libmbar/1.0.0
      %configured style-basic/.+%
      configured libmbar/1.0.0
      %info: .+ is up to date%
      updated libmbar/1.0.0
      EOE

    $pkg_disfigure libmbar;
    $pkg_disfigure style-basic;

    $pkg_purge libmbar;
    $pkg_purge style-basic
  }

  : prerequisite-repo-config
  :
  : As above but with a linked configuration.
  :
  {
    $clone_root_cfg;
    $rep_add "$rep0/libbar.git#master";
    $rep_fetch &cfg/.bpkg/repos/*/***;

    $cfg_create -d cfg2 &cfg2/***;
    $cfg_link -d cfg cfg2;

    $rep_add -d cfg2 "$rep0/style-basic.git#master";
    $rep_fetch -d cfg2 &cfg/.bpkg/repos/*/***;

    $* libmbar style-basic +{ --config-id 1 } 2>>~%EOE%;
      %checked out style-basic/.+ \[cfg2.\]%
      checked out libmbar/1.0.0
      %configured style-basic/.+ \[cfg2.\]%
      configured libmbar/1.0.0
      %info: .+ is up to date%{2}
      %updated style-basic/.+ \[cfg2.\]%
      updated libmbar/1.0.0
      EOE

    $pkg_disfigure         libmbar;
    $pkg_disfigure -d cfg2 style-basic;

    $pkg_purge         libmbar;
    $pkg_purge -d cfg2 style-basic
  }

  : no-prerequisite-repos
  :
  : Dependent package repository has no prerequisites nor complements. Its
  : dependency is picked up via the root repository that complements its
  : repository (see rep_fetch() function implementation for details).
  :
  {
    $clone_root_cfg;
    $rep_add "$rep1/libbaz.git#master";
    $rep_add "$rep0/style-basic.git#master";
    $rep_fetch &cfg/.bpkg/repos/*/***;

    $* libbaz 2>>~%EOE%;
      %checked out style-basic/.+%
      checked out libbaz/1.0.0
      %configured style-basic/.+%
      configured libbaz/1.0.0
      %info: .+ is up to date%
      updated libbaz/1.0.0
      EOE

    $pkg_disfigure libbaz;
    $pkg_disfigure style-basic;

    $pkg_purge libbaz;
    $pkg_purge style-basic
  }

  : build-unpacked
  :
  : Test that the unpacked external package is properly built for the first
  : time and is replaced afterwards via the directory argument.
  :
  if! $remote
  {
    $clone_root_cfg;

    d = $canonicalize([dir_path] $out_git/state0/style-basic.git);
    $pkg_unpack -e $d;

    $* style-basic 2>>~%EOE%;
      %configured style-basic/1\.1\.0-a\.0\.\d+\..+%
      %info: .+ is up to date%
      %updated style-basic/1\.1\.0-a\.0\.\d+\..+%
      EOE

    $* $d 2>>~%EOE%;
      %disfigured style-basic/1\.1\.0-a\.0\.\d+\..+%
      %using style-basic/1\.1\.0-a\.0\.\d+\..+%
      %configured style-basic/1\.1\.0-a\.0\.\d+\..+%
      %info: .+ is up to date%
      %updated style-basic/1\.1\.0-a\.0\.\d+\..+%
      EOE

    $pkg_disfigure style-basic
  }

  : build-unpacked-config
  :
  : As above but with a linked configuration.
  :
  if! $remote
  {
    $clone_root_cfg;

    $cfg_create -d cfg2 &cfg2/***;
    $cfg_link -d cfg cfg2;

    d = $canonicalize([dir_path] $out_git/state0/style-basic.git);
    $pkg_unpack -d cfg2 -e $d;

    $* style-basic +{ --config-id 1 } 2>>~%EOE%;
      %configured style-basic/1\.1\.0-a\.0\.\d+\..+%
      %info: .+ is up to date%
      %updated style-basic/1\.1\.0-a\.0\.\d+\..+%
      EOE

    $* $d +{ --config-id 1 } 2>>~%EOE%;
      %disfigured style-basic/1\.1\.0-a\.0\.\d+\..+%
      %using style-basic/1\.1\.0-a\.0\.\d+\..+%
      %configured style-basic/1\.1\.0-a\.0\.\d+\..+%
      %info: .+ is up to date%
      %updated style-basic/1\.1\.0-a\.0\.\d+\..+%
      EOE

    $pkg_disfigure -d cfg2 style-basic
  }

  : checkout-root
  :
  {
    $clone_root_cfg;
    $rep_fetch "$rep0/libbar.git#master" &cfg/.bpkg/repos/*/***;

    # While at it, test the package checkout cache (thus build multiple
    # packages from the same git repository).
    #
    $* libbar libmbar --checkout-root $~ --checkout-purge 2>>~%EOE%;
      %checked out style-basic/.+%
      checked out libbar/1.0.0+1
      checked out libmbar/1.0.0
      %configured style-basic/.+%
      configured libbar/1.0.0+1
      configured libmbar/1.0.0
      %info: .+ is up to date%{2}
      updated libbar/1.0.0+1
      updated libmbar/1.0.0
      EOE

    test -d libmbar-1.0.0;

    $pkg_drop libbar libmbar
  }
}

: linked-configs
:
{
  : 2-configs
  :
  {
    +$clone_root_cfg && $rep_add $rep/t4c && $rep_fetch

    : invalid-cfg
    :
    {
      +$clone_cfg

      : config-id
      :
      {
        $clone_cfg;
        $* libbaz --config-id 1 2>>/EOE != 0
          error: no configuration with id 1 is linked with cfg/
          EOE
      }

      : config-name
      :
      {
        $clone_cfg;
        $* libbaz --config-name foo 2>>/EOE != 0
          error: no configuration with name 'foo' is linked with cfg/
          EOE
      }

      : config-uuid
      :
      {
        $clone_cfg;
        $* libbaz --config-uuid '18f48b4b-b5d9-4712-b98c-1930df1c4228' 2>>/EOE != 0
          error: no configuration with uuid 18f48b4b-b5d9-4712-b98c-1930df1c4228 is linked with cfg/
          EOE
      }
    }

    : baz
    :
    {
      $clone_cfg;
      $cfg_create -d cfg-bar-foo &cfg-bar-foo/***;
      $cfg_link -d cfg cfg-bar-foo;

      $* libbaz ?libbar +{ --config-id 1 } ?libfoo +{ --config-id 1 } 2>>~%EOE%;
        %fetched libfoo/1.1.0 \[cfg-bar-foo.\]%
        %unpacked libfoo/1.1.0 \[cfg-bar-foo.\]%
        %fetched libbar/1.1.0 \[cfg-bar-foo.\]%
        %unpacked libbar/1.1.0 \[cfg-bar-foo.\]%
        fetched libbaz/1.1.0
        unpacked libbaz/1.1.0
        %configured libfoo/1.1.0 \[cfg-bar-foo.\]%
        %configured libbar/1.1.0 \[cfg-bar-foo.\]%
        configured libbaz/1.1.0
        %info: cfg[^-].+libbaz-1.1.0.+ is up to date%
        updated libbaz/1.1.0
        EOE

      $pkg_status -r libbaz >>/EOO;
        !libbaz configured 1.1.0
          libbar [cfg-bar-foo/] configured 1.1.0
            libfoo [cfg-bar-foo/] configured 1.1.0
          libfoo [cfg-bar-foo/] configured 1.1.0
        EOO

      $pkg_status -d cfg-bar-foo -r libbar >>/EOO;
        libbar configured 1.1.0
          libfoo configured 1.1.0
        EOO

      $pkg_status -d cfg-bar-foo libfoo >'libfoo configured 1.1.0';

      $pkg_drop libbaz;

      $pkg_status libbaz libbar libfoo >>/EOO
        libbaz available 1.1.0
        libbar available [1.1.0]
        libfoo available [1.1.0] 1.0.0
        EOO
    }
  }

  : 3-configs
  :
  {
    +$clone_root_cfg && $rep_add $rep/t4c && $rep_fetch

    : baz
    :
    {
      uuid = '28f48b4b-b5d9-4712-b98c-1930df1c4228';

      $clone_cfg;
      $cfg_create -d cfg-bar &cfg-bar/***;
      $cfg_create -d cfg-foo --uuid $uuid &cfg-foo/***;

      $cfg_link -d cfg     cfg-bar;
      $cfg_link -d cfg-bar cfg-foo;

      test.arguments = $regex.apply($test.arguments, cfg, cfg-bar);

      $* libbar@"$rep/t4b" ?libfoo +{ --config-id 2 } --trust-yes 2>>~%EOE%;
        added pkg:build2.org/pkg-build/t4b
        fetching pkg:build2.org/pkg-build/t4b
        fetching pkg:build2.org/pkg-build/t4a (prerequisite of pkg:build2.org/pkg-build/t4b)
        %fetched libfoo/1.1.0 \[cfg-foo.\]%
        %unpacked libfoo/1.1.0 \[cfg-foo.\]%
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        %configured libfoo/1.1.0 \[cfg-foo.\]%
        configured libbar/1.1.0
        %info: cfg-bar.+libbar-1.1.0.+ is up to date%
        updated libbar/1.1.0
        EOE

      test.arguments = $regex.apply($test.arguments, cfg-bar, cfg);

      $* libfoo --config-uuid $uuid 2>>~%EOE%;
        %info: cfg-foo.+libfoo-1.1.0.+ is up to date%
        %updated libfoo/1.1.0 \[cfg-foo.\]%
        EOE

      $* libbaz 2>>~%EOE%;
        fetched libbaz/1.1.0
        unpacked libbaz/1.1.0
        configured libbaz/1.1.0
        %info: cfg[^-].+libbaz-1.1.0.+ is up to date%
        updated libbaz/1.1.0
        EOE

      $pkg_status --link -r >>/EOO;
        !libbaz configured 1.1.0
          !libbar [cfg-bar/] configured !1.1.0
            !libfoo [cfg-foo/] configured 1.1.0
          !libfoo [cfg-foo/] configured 1.1.0
        !libbar [cfg-bar/] configured !1.1.0
          !libfoo [cfg-foo/] configured 1.1.0
        !libfoo [cfg-foo/] configured 1.1.0
        EOO

      $pkg_drop libbaz;

      $* ?libfoo --config-uuid $uuid; # Unhold.

      $pkg_status libbaz libbar libfoo >>/EOO;
        libbaz available 1.1.0
        !libbar [cfg-bar/] configured !1.1.0
        libfoo [cfg-foo/] configured 1.1.0
        EOO

      $* ?libbar +{ --config-id 1 } <'y' 2>>~%EOE%;
        %  drop libfoo/1.1.0 \[cfg-foo.\] \(unused\)%
        %  drop libbar/1.1.0 \[cfg-bar.\] \(unused\)%
        %continue\? \[Y/n\] disfigured libbar/1.1.0 \[cfg-bar.\]%
        %disfigured libfoo/1.1.0 \[cfg-foo.\]%
        %purged libfoo/1.1.0 \[cfg-foo.\]%
        %purged libbar/1.1.0 \[cfg-bar.\]%
        EOE

      $pkg_status libbar libfoo >>/EOO
        libbar available [1.1.0]
        libfoo available [1.1.0] 1.0.0
        EOO
    }
  }

  : buildtime-dep
  :
  {
    +$clone_root_cfg && $rep_add $rep/t7a && $rep_fetch

    : external-config
    :
    {
      +$clone_cfg
      +$cfg_create -d cfg2 --type host --name cfg2 &cfg2/***
      +$cfg_link -d cfg cfg2

      : downgrade-dependency
      :
      {
        $clone_cfg;
        cp -pr ../cfg2 ./;

        $* libbar <'y' 2>>~%EOE%;
          %  new libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\] \(required by foo \[cfg2.\]\)%
          %  new libbaz/1.0.0 \[cfg2.\] \(required by foo \[cfg2.\]\)%
          %  new foo/1.0.0 \[cfg2.\] \(required by libbar\)%
          %  new libbaz/1.0.0 \(required by libbar\)%
            new libbar/1.0.0
          %continue\? \[Y/n\] fetched libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %unpacked libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %fetched libbaz/1.0.0 \[cfg2.\]%
          %unpacked libbaz/1.0.0 \[cfg2.\]%
          %fetched foo/1.0.0 \[cfg2.\]%
          %unpacked foo/1.0.0 \[cfg2.\]%
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          %configured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %configured libbaz/1.0.0 \[cfg2.\]%
          %configured foo/1.0.0 \[cfg2.\]%
          configured libbaz/1.0.0
          configured libbar/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -r libbar >>/EOO;
          !libbar configured 1.0.0
            foo [cfg2/] configured 1.0.0
              libbaz [cfg2/] configured 1.0.0
              libbuild2-bar [cfg2/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          EOO

        # While at it, make sure that from several available host
        # configurations the selected package configuration is chosen and we
        # don't fail with the 'multiple possible host configurations'
        # diagnostics.
        #
        $cfg_create -d cfg3 --type host &cfg3/***;
        $cfg_link -d cfg cfg3;

        $rep_add $rep/t7b && $rep_fetch;

        $* libbar <'y' 2>>~%EOE%;
          %  drop libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\] \(unused\)%
          %  upgrade libbaz/1.1.0 \[cfg2.\] \(required by foo \[cfg2.\]\)%
          %  upgrade foo/1.1.0 \[cfg2.\] \(required by libbar\)%
            upgrade libbar/1.1.0
          %continue\? \[Y/n\] disfigured libbar/1.0.0%
          %disfigured foo/1.0.0 \[cfg2.\]%
          %disfigured libbaz/1.0.0 \[cfg2.\]%
          %disfigured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %fetched libbaz/1.1.0 \[cfg2.\]%
          %unpacked libbaz/1.1.0 \[cfg2.\]%
          %fetched foo/1.1.0 \[cfg2.\]%
          %unpacked foo/1.1.0 \[cfg2.\]%
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          %configured libbaz/1.1.0 \[cfg2.\]%
          %configured foo/1.1.0 \[cfg2.\]%
          configured libbar/1.1.0
          %info: .+libbar-1.1.0.+ is up to date%
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>/EOO;
          !libbar configured 1.1.0
            foo [cfg2/] configured 1.1.0
              libbaz [cfg2/] configured 1.1.0
            libbaz configured 1.0.0 available 1.1.0
          EOO

        $* libbar/1.0.0 ?foo/1.0.0 +{ --config-name cfg2 } \
           ?libbaz/1.0.0 +{ --config-id 1 } <'y' &cfg2/.bpkg/build2/*** 2>>~%EOE%;
          %  new libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\] \(required by foo \[cfg2.\]\)%
          %  downgrade libbaz/1.0.0 \[cfg2.\]%
          %  downgrade foo/1.0.0 \[cfg2.\]%
            downgrade libbar/1.0.0
          continue? [Y/n] disfigured libbar/1.1.0
          %disfigured foo/1.1.0 \[cfg2.\]%
          %disfigured libbaz/1.1.0 \[cfg2.\]%
          %fetched libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %unpacked libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %fetched libbaz/1.0.0 \[cfg2.\]%
          %unpacked libbaz/1.0.0 \[cfg2.\]%
          %fetched foo/1.0.0 \[cfg2.\]%
          %unpacked foo/1.0.0 \[cfg2.\]%
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          %configured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %configured libbaz/1.0.0 \[cfg2.\]%
          %configured foo/1.0.0 \[cfg2.\]%
          configured libbar/1.0.0
          %info: cfg.+libbar-1.0.0.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -r libbar >>/EOO;
          !libbar configured !1.0.0 available 1.1.0
            foo [cfg2/] configured !1.0.0 available 1.1.0
              libbaz [cfg2/] configured !1.0.0 available 1.1.0
              libbuild2-bar [cfg2/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0 available 1.1.0
          EOO

        $pkg_drop libbar libbaz
      }

      : resolve-host-config
      :
      {
        $clone_cfg;
        cp -pr ../cfg2 ./;

        $cfg_create -d cfg3 --type host &cfg3/***;
        $cfg_link -d cfg cfg3;

        $* libbar 2>>/~%EOE% != 0;
          error: multiple possible host configurations for build-time dependency (foo ^1.0.0)
            info: cfg2/
            info: cfg3/
            info: use --config-* to select the configuration
          %info: while satisfying libbar.1.0.0%
          EOE

        $* libbar ?foo +{ --config-id 2 } --yes 2>!;

        $pkg_status -r libbar >>/EOO;
          !libbar configured 1.0.0
            foo [cfg3/] configured 1.0.0
              libbaz [cfg3/] configured 1.0.0
              libbuild2-bar [cfg3/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbar
      }

      : 3-configs
      :
      {
        $clone_cfg;
        cp -pr ../cfg2 ./;

        $cfg_create -d cfg3 --type host &cfg3/***;
        $cfg_link -d cfg2 cfg3;

        $rep_add -d cfg3 $rep/t7a && $rep_fetch -d cfg3;

        test.arguments = $regex.apply($test.arguments, cfg, cfg2);

        $* libbaz +{ --config-id 2 } 2>!;

        test.arguments = $regex.apply($test.arguments, cfg2, cfg);

        $* libbar --yes &cfg2/.bpkg/build2/*** 2>>~%EOE%;
          %fetched libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %unpacked libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %fetched foo/1.0.0 \[cfg2.\]%
          %unpacked foo/1.0.0 \[cfg2.\]%
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          %configured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %configured foo/1.0.0 \[cfg2.\]%
          configured libbaz/1.0.0
          configured libbar/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -r libbar >>/EOO;
          !libbar configured 1.0.0
            foo [cfg2/] configured 1.0.0
              !libbaz [cfg3/] configured 1.0.0
              libbuild2-bar [cfg2/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbar
      }
    }

    : private-config
    :
    {
      $clone_cfg;

      $* libbar <'y' 2>>~%EOE% &cfg/.bpkg/host/*** &cfg/.bpkg/build2/***;
        %  new libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\] \(required by foo \[cfg..bpkg.host.\]\)%
        %  new libbaz/1.0.0 \[cfg..bpkg.host.\] \(required by foo \[cfg..bpkg.host.\]\)%
        %  new foo/1.0.0 \[cfg..bpkg.host.\] \(required by libbar\)%
        %  new libbaz/1.0.0 \(required by libbar\)%
          new libbar/1.0.0
        %continue\? \[Y/n\] fetched libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %unpacked libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %fetched foo/1.0.0 \[cfg..bpkg.host.\]%
        %unpacked foo/1.0.0 \[cfg..bpkg.host.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        %configured libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %configured foo/1.0.0 \[cfg..bpkg.host.\]%
        configured libbaz/1.0.0
        configured libbar/1.0.0
        %info: .+libbar-1.0.0.+ is up to date%
        updated libbar/1.0.0
        EOE

      $pkg_status -r libbar >>/EOO;
        !libbar configured 1.0.0
          foo [cfg/.bpkg/host/] configured 1.0.0
            libbaz [cfg/.bpkg/host/] configured 1.0.0
            libbuild2-bar [cfg/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $rep_add $rep/t7b && $rep_fetch;

      $* libbar <'y' 2>>~%EOE%;
        %  drop libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\] \(unused\)%
        %  upgrade libbaz/1.1.0 \[cfg..bpkg.host.\] \(required by foo \[cfg..bpkg.host.\]\)%
        %  upgrade foo/1.1.0 \[cfg..bpkg.host.\] \(required by libbar\)%
          upgrade libbar/1.1.0
        %continue\? \[Y/n\] disfigured libbar/1.0.0%
        %disfigured foo/1.0.0 \[cfg..bpkg.host.\]%
        %disfigured libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %disfigured libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %purged libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %fetched libbaz/1.1.0 \[cfg..bpkg.host.\]%
        %unpacked libbaz/1.1.0 \[cfg..bpkg.host.\]%
        %fetched foo/1.1.0 \[cfg..bpkg.host.\]%
        %unpacked foo/1.1.0 \[cfg..bpkg.host.\]%
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        %configured libbaz/1.1.0 \[cfg..bpkg.host.\]%
        %configured foo/1.1.0 \[cfg..bpkg.host.\]%
        configured libbar/1.1.0
        %info: .+libbar-1.1.0.+ is up to date%
        updated libbar/1.1.0
        EOE

      $pkg_status -r libbar >>/EOO;
        !libbar configured 1.1.0
          foo [cfg/.bpkg/host/] configured 1.1.0
            libbaz [cfg/.bpkg/host/] configured 1.1.0
          libbaz configured 1.0.0 available 1.1.0
        EOO

      $pkg_drop libbar
    }

    : self-hosted-config
    :
    {
      $cfg_create -d cfg --type host &cfg/***;
      $rep_add $rep/t7a && $rep_fetch;

      $* libbar <'y' 2>>~%EOE%;
        %  new libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\] \(required by foo\)%
          new libbaz/1.0.0 (required by foo, libbar)
          new foo/1.0.0 (required by libbar)
          new libbar/1.0.0
        %continue\? \[Y/n\] fetched libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched foo/1.0.0
        unpacked foo/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        %configured libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        configured libbaz/1.0.0
        configured foo/1.0.0
        configured libbar/1.0.0
        %info: .+libbar-1.0.0.+ is up to date%
        updated libbar/1.0.0
        EOE

      $pkg_status -r libbar >>/EOO;
        !libbar configured 1.0.0
          foo configured 1.0.0
            libbaz configured 1.0.0
            libbuild2-bar [cfg/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $rep_add $rep/t7b && $rep_fetch;

      $* libbar <'y' 2>>~%EOE%;
        %  drop libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\] \(unused\)%
          upgrade libbaz/1.1.0 (required by foo, libbar)
          upgrade foo/1.1.0 (required by libbar)
          upgrade libbar/1.1.0
        continue? [Y/n] disfigured libbar/1.0.0
        disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        %disfigured libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %purged libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        fetched libbaz/1.1.0
        unpacked libbaz/1.1.0
        fetched foo/1.1.0
        unpacked foo/1.1.0
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        configured libbaz/1.1.0
        configured foo/1.1.0
        configured libbar/1.1.0
        %info: .+libbar-1.1.0.+ is up to date%
        updated libbar/1.1.0
        EOE

      $pkg_status -r libbar >>/EOO;
        !libbar configured 1.1.0
          foo configured 1.1.0
            libbaz configured 1.1.0
          libbaz configured 1.1.0
        EOO

      $pkg_drop libbar
    }
  }

  : verify-dependencies
  :
  {
    +$clone_root_cfg && $rep_add $rep/t7a && $rep_fetch

    : fail
    :
    {
      $cfg_create -d cfg2 &cfg2/***;
      $rep_add -d cfg2 $rep/t7a && $rep_fetch -d cfg2;

      $cfg_create -d cfg3 &cfg3/***;
      $rep_add -d cfg3 $rep/t7a && $rep_fetch -d cfg3;

      test.arguments = $regex.apply($test.arguments, cfg, cfg2);

      $* --yes libbar 2>!;

      test.arguments = $regex.apply($test.arguments, cfg2, cfg3);

      $* --yes libbox 2>!;

      $clone_cfg;
      $cfg_link -d cfg cfg2;
      $cfg_link -d cfg cfg3;

      test.arguments = $regex.apply($test.arguments, cfg3, cfg);

      $* libfix --yes 2>>~%EOE% != 0
        error: package libbaz indirectly required by libfix/1.0.0 is configured in multiple configurations
        %  info: libbaz/1.0.0 \[cfg3.\]%
        %  info: libbaz/1.0.0 \[cfg2.\]%
        EOE
    }

    : succeed
    :
    {
      $cfg_create -d cfg2 &cfg2/***;
      $rep_add -d cfg2 $rep/t7b && $rep_fetch -d cfg2;

      $cfg_create -d cfg3 &cfg3/***;
      $rep_add -d cfg3 $rep/t7b && $rep_fetch -d cfg3;

      test.arguments = $regex.apply($test.arguments, cfg, cfg2);

      $* --yes libbar 2>!;

      test.arguments = $regex.apply($test.arguments, cfg2, cfg3);

      $* --yes libbox 2>!;

      $clone_cfg;
      $cfg_link -d cfg cfg2;
      $cfg_link -d cfg cfg3;

      test.arguments = $regex.apply($test.arguments, cfg3, cfg);

      $* libfix --yes 2>>~%EOE%;
        fetched libfax/1.0.0
        unpacked libfax/1.0.0
        fetched libfix/1.0.0
        unpacked libfix/1.0.0
        configured libfax/1.0.0
        configured libfix/1.0.0
        %info: .+libfix-1.0.0.+ is up to date%
        updated libfix/1.0.0
        EOE

      $pkg_drop libfix
    }
  }

  : change-config
  :
  {
    : copy
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbaz --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbaz configured 1.0.0
        EOO

      $rep_add -d t2 $rep/t7a && $rep_fetch -d t2;

      $* libbaz +{ --config-name t2 } 2>>~%EOE%;
        %fetched libbaz/1.0.0 \[t2.\]%
        %unpacked libbaz/1.0.0 \[t2.\]%
        %configured libbaz/1.0.0 \[t2.\]%
        %info: t2.+libbaz-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[t2.\]%
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !libbaz configured 1.0.0
        !libbaz [t2/] configured 1.0.0
        EOO
    }

    : copy-unhold
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbaz --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbaz configured 1.0.0
        EOO

      $* ?libbaz +{ --config-name t2 };

      $pkg_status -d t1 -r >>/EOO
        !libbaz configured 1.0.0
        EOO
    }

    : copy-point
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbaz --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbaz configured 1.0.0
        EOO

      $rep_add -d t2 $rep/t7a && $rep_fetch -d t2;

      $* foo libbaz +{ --config-name t2 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[t1..bpkg.build2.\] \(required by foo\)%
        %  new libbaz/1.0.0 \[t2.\]%
          new foo/1.0.0
        %continue\? \[Y.n\] fetched libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[t2.\]%
        %unpacked libbaz/1.0.0 \[t2.\]%
        fetched foo/1.0.0
        unpacked foo/1.0.0
        %configured libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[t2.\]%
        configured foo/1.0.0
        %info: t2.+libbaz-1.0.0.+ is up to date%
        %info: t1.+foo-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[t2.\]%
        updated foo/1.0.0
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !libbaz configured 1.0.0
        !foo configured 1.0.0
          !libbaz [t2/] configured 1.0.0
          libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
        !libbaz [t2/] configured 1.0.0
        EOO
    }

    : copy-unhold-point
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbaz --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbaz configured 1.0.0
        EOO

      $* foo ?libbaz +{ --config-name t2 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[t1..bpkg.build2.\] \(required by foo\)%
        %  new libbaz/1.0.0 \[t2.\] \(required by foo\)%
        %  new foo/1.0.0%
        %continue\? \[Y.n\] fetched libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[t2.\]%
        %unpacked libbaz/1.0.0 \[t2.\]%
        fetched foo/1.0.0
        unpacked foo/1.0.0
        %configured libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[t2.\]%
        configured foo/1.0.0
        %info: t1.+foo-1.0.0.+ is up to date%
        updated foo/1.0.0
        EOE

      $pkg_status -d t1 -r >>/EOO
        !libbaz configured 1.0.0
        !foo configured 1.0.0
          libbaz [t2/] configured 1.0.0
          libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
        EOO
    }

    : copy-repoint
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d t1 h1;
      $cfg_link -d t1 h2;

      $cfg_link -d t2 h1;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;
      $rep_add -d t2 $rep/t7a && $rep_fetch -d t2;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbar ?foo +{ --config-name h1 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[h1..bpkg.build2.\] \(required by foo \[h1.\]\)%
        %  new libbaz/1.0.0 \[h1.\] \(required by foo \[h1.\]\)%
        %  new foo/1.0.0 \[h1.\] \(required by libbar\)%
          new libbaz/1.0.0 (required by libbar)
          new libbar/1.0.0
        %continue\? \[Y/n\] fetched libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[h1.\]%
        %unpacked libbaz/1.0.0 \[h1.\]%
        %fetched foo/1.0.0 \[h1.\]%
        %unpacked foo/1.0.0 \[h1.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        %configured libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[h1.\]%
        %configured foo/1.0.0 \[h1.\]%
        configured libbaz/1.0.0
        configured libbar/1.0.0
        %info: t1.+libbar-1.0.0.+ is up to date%
        updated libbar/1.0.0
        EOE

      $pkg_status -d t1 -r >>/EOO;
        !libbar configured 1.0.0
          foo [h1/] configured 1.0.0
            libbaz [h1/] configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      test.arguments = $regex.apply($test.arguments, t1, t2);

      $* libbox ?foo +{ --config-name h1 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  update foo/1.0.0 \[h1.\]%
          new libbaz/1.0.0 (required by libbox)
          new libbox/1.0.0
        continue? [Y/n] fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched libbox/1.0.0
        unpacked libbox/1.0.0
        configured libbaz/1.0.0
        configured libbox/1.0.0
        %info: t2.+libbox-1.0.0.+ is up to date%
        updated libbox/1.0.0
        EOE

      $pkg_status -d t2 -r >>/EOO;
        !libbox configured 1.0.0
          foo [h1/] configured 1.0.0
            libbaz [h1/] configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      test.arguments = $regex.apply($test.arguments, t2, t1);

      $* ?foo +{ --config-name h2 } <<EOI 2>>~%EOE%;
        y
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[h2..bpkg.build2.\] \(required by foo \[h2.\]\)%
        %  new libbaz/1.0.0 \[h2.\] \(required by foo \[h2.\]\)%
        %  new foo/1.0.0 \[h2.\] \(required by libbar\)%
        %  reconfigure libbar/1.0.0 \(dependent of foo \[h2.\]\)%
        continue? [Y/n] update dependent packages? [Y/n] disfigured libbar/1.0.0
        %fetched libbuild2-bar/1.0.0 \[h2..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[h2..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[h2.\]%
        %unpacked libbaz/1.0.0 \[h2.\]%
        %fetched foo/1.0.0 \[h2.\]%
        %unpacked foo/1.0.0 \[h2.\]%
        %configured libbuild2-bar/1.0.0 \[h2..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[h2.\]%
        %configured foo/1.0.0 \[h2.\]%
        configured libbar/1.0.0
        %info: t1.+libbar-1.0.0.+ is up to date%
        updated libbar/1.0.0
        EOE

      $pkg_status -d t1 -r >>/EOO;
        !libbar configured 1.0.0
          foo [h2/] configured 1.0.0
            libbaz [h2/] configured 1.0.0
            libbuild2-bar [h2/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $pkg_status -d t2 -r >>/EOO
        !libbox configured 1.0.0
          foo [h1/] configured 1.0.0
            libbaz [h1/] configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO
    }

    : copy-repoint-drop
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* foo --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
        EOO

      $rep_add -d t2 $rep/t7a && $rep_fetch -d t2;

      $* libbaz +{ --config-name t2 } <<EOI 2>>~%EOE%;
        y
        y
        EOI
          drop libbaz/1.0.0 (unused)
        %  new libbaz/1.0.0 \[t2.\]%
        %  reconfigure foo/1.0.0 \(dependent of libbaz \[t2.\]\)%
        continue? [Y/n] update dependent packages? [Y/n] disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        purged libbaz/1.0.0
        %fetched libbaz/1.0.0 \[t2.\]%
        %unpacked libbaz/1.0.0 \[t2.\]%
        %configured libbaz/1.0.0 \[t2.\]%
        configured foo/1.0.0
        %info: t2.+libbaz-1.0.0.+ is up to date%
        %info: t1.+foo-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[t2.\]%
        updated foo/1.0.0
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !foo configured 1.0.0
          !libbaz [t2/] configured 1.0.0
          libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
        !libbaz [t2/] configured 1.0.0
        EOO
    }

    : drop-repointed
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* foo --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
        EOO

      $rep_add -d t2 $rep/t7a && $rep_fetch -d t2;

      $* ?foo libbaz +{ --config-name t2 } --verbose 5 <<EOI 2>>~%EOE%;
        y
        EOI
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        %trace: collect_build: add libbaz/1.0.0 \[t2.\]%
        %trace: collect_build_prerequisites: begin libbaz/1.0.0 \[t2.\]%
        %trace: collect_build_prerequisites: end libbaz/1.0.0 \[t2.\]%
        %.*
        trace: collect_build_prerequisites: begin foo/1.0.0
        %.*
        %trace: collect_build_prerequisites: no cfg-clause for dependency libbaz/1.0.0 \[t2.\] of dependent foo/1.0.0%
        trace: collect_build_prerequisites: end foo/1.0.0
        %.*
        trace: execute_plan: simulate: yes
        %.*
        trace: evaluate_dependency: libbaz/1.0.0: unused
        %.*
        trace: evaluate_dependency: foo/1.0.0: unused
        %.*
        trace: pkg_build: refine package collection/plan execution
        %.*
        trace: collect_drop: foo/1.0.0 package version needs to be replaced with drop
        trace: pkg_build: collection failed due to package version replacement, retry from scratch
        %.*
        trace: pkg_build: refine package collection/plan execution from scratch
        %.*
        %trace: collect_build: add libbaz/1.0.0 \[t2.\]%
        %trace: collect_build_prerequisites: begin libbaz/1.0.0 \[t2.\]%
        %trace: collect_build_prerequisites: end libbaz/1.0.0 \[t2.\]%
        trace: collect_build: apply version replacement for foo/1.0.0
        trace: collect_build: replacement: drop
        %.*
        trace: execute_plan: simulate: yes
        %.*
        %trace: evaluate_dependency: libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]: unused%
        %.*
        trace: pkg_build: refine package collection/plan execution
        %.*
        trace: execute_plan: simulate: yes
        %.*
        %  drop libbuild2-bar/1.0.0 \[t1..bpkg.build2.\] \(unused\)%
          drop libbaz/1.0.0 (unused)
          drop foo/1.0.0 (unused)
        %  new libbaz/1.0.0 \[t2.\]%
        continue? [Y/n] trace: execute_plan: simulate: no
        %.*
        disfigured foo/1.0.0
        %.*
        disfigured libbaz/1.0.0
        %.*
        %disfigured libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %.*
        %purged libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %.*
        purged libbaz/1.0.0
        %.*
        purged foo/1.0.0
        %.*
        %fetched libbaz/1.0.0 \[t2.\]%
        %.*
        %unpacked libbaz/1.0.0 \[t2.\]%
        %.*
        %configured libbaz/1.0.0 \[t2.\]%
        %.*
        %info: .+t2.+libbaz-1.0.0.+ is up to date%
        %.*
        %updated libbaz/1.0.0 \[t2.\]%
        %.*
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !libbaz [t2/] configured 1.0.0
        EOO
    }

    : dependency-repointed
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, cfg, h1);

      $* foo --yes 2>!;

      $pkg_status -d h1 -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        EOO

      $rep_add -d h2 $rep/t7a && $rep_fetch -d h2;

      $* libbar libbaz +{ --config-name h2 } <<EOI 2>>~%EOE%;
        y
        EOI
          drop libbaz/1.0.0 (unused)
        %  new libbaz/1.0.0 \[h2.\]%
          reconfigure/update foo/1.0.0 (required by libbar)
          new libbar/1.0.0
        continue? [Y/n] disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        purged libbaz/1.0.0
        %fetched libbaz/1.0.0 \[h2.\]%
        %unpacked libbaz/1.0.0 \[h2.\]%
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        %configured libbaz/1.0.0 \[h2.\]%
        configured foo/1.0.0
        configured libbar/1.0.0
        %info: h2.+libbaz-1.0.0.+ is up to date%
        %info: h1.+libbar-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[h2.\]%
        updated libbar/1.0.0
        EOE

      $pkg_status -d h1 --link -r >>/EOO
        !foo configured 1.0.0
          !libbaz [h2/] configured 1.0.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        !libbar configured 1.0.0
          !foo configured 1.0.0
            !libbaz [h2/] configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          !libbaz [h2/] configured 1.0.0
        !libbaz [h2/] configured 1.0.0
        EOO
    }

    : dependency-repointed-system
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, cfg, h1);

      $* foo --yes 2>!;

      $pkg_status -d h1 -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        EOO

      $* libbar '?sys:foo/1.2.0' +{ --config-name h1 } \
                 ?libbaz +{ --config-name h2 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  drop libbuild2-bar/1.0.0 \[h1..bpkg.build2.\] \(unused\)%
          drop libbaz/1.0.0 (unused)
          reconfigure/unhold sys:foo/1.2.0
        %  new libbaz/1.0.0 \[h2.\] \(required by libbar\)%
          new libbar/1.0.0
        continue? [Y/n] disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        %disfigured libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %purged libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        purged libbaz/1.0.0
        purged foo/1.0.0
        %fetched libbaz/1.0.0 \[h2.\]%
        %unpacked libbaz/1.0.0 \[h2.\]%
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured sys:foo/1.2.0
        %configured libbaz/1.0.0 \[h2.\]%
        configured libbar/1.0.0
        %info: h1.+libbar-1.0.0.+ is up to date%
        updated libbar/1.0.0
        EOE

      $pkg_status -d h1 -r >>/EOO;
        !libbar configured 1.0.0
          foo configured,system !1.2.0
          libbaz [h2/] configured 1.0.0
        EOO

      $* ?foo ?libbaz <<EOI 2>>~%EOE%;
        y
        y
        EOI
        %  drop libbaz/1.0.0 \[h2.\] \(unused\)%
        %  new libbuild2-bar/1.0.0 \[h1..bpkg.build2.\] \(required by foo\)%
          new libbaz/1.0.0 (required by foo, libbar)
          downgrade foo/1.0.0
          reconfigure libbar/1.0.0 (dependent of libbaz)
        continue? [Y/n] update dependent packages? [Y/n] disfigured libbar/1.0.0
        purged foo/1.2.0
        %disfigured libbaz/1.0.0 \[h2.\]%
        %purged libbaz/1.0.0 \[h2.\]%
        %fetched libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched foo/1.0.0
        unpacked foo/1.0.0
        %configured libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        configured libbaz/1.0.0
        configured foo/1.0.0
        configured libbar/1.0.0
        %info: h1.+libbar-1.0.0.+ is up to date%
        updated libbar/1.0.0
        EOE

      $pkg_status -d h1 -r >>/EOO
        !libbar configured 1.0.0
          foo configured 1.0.0
            libbaz configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO
    }

    : orphan-repointed
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h1 $rep/t7b && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, cfg, h1);

      $* foo --yes 2>!;

      $rep_remove -d h1 $rep/t7b;
      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;

      $rep_add -d h2 $rep/t7a && $rep_fetch -d h2;

      $* libbaz +{ --config-name h2 } 2>>EOE != 0;
        error: package foo/1.1.0 is orphaned
          info: explicitly upgrade it to a new version
        info: while satisfying foo/1.1.0
        EOE

      # While at it, test foo deorphaning.
      #
      $* foo +{ --deorphan } libbaz +{ --config-name h2 } --yes --plan "" 2>>~%EOE%;
          drop libbaz/1.1.0 (unused)
        %  new libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\] \(required by foo\)%
        %  new libbaz/1.0.0 \[h2.\]%
          replace/downgrade foo/1.0.0
        disfigured foo/1.1.0
        disfigured libbaz/1.1.0
        purged libbaz/1.1.0
        %fetched libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[h2.\]%
        %unpacked libbaz/1.0.0 \[h2.\]%
        fetched foo/1.0.0
        unpacked foo/1.0.0
        %configured libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\]%
        %configured libbaz/1.0.0 \[h2.\]%
        configured foo/1.0.0
        %info: h2.+libbaz-1.0.0.+ is up to date%
        %info: h1.+foo-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[h2.\]%
        updated foo/1.0.0
        EOE

      $pkg_status -d h1 -r >>/EOO
        !foo configured 1.0.0
          !libbaz [h2/] configured 1.0.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        EOO
    }

    : orphan-repointed-masked
    :
    : As above but using --mask-repository instead of rep-remove.
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h1 $rep/t7b && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, cfg, h1);

      $* foo --yes 2>!;

      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;
      $rep_add -d h2 $rep/t7a && $rep_fetch -d h2;

      $* libbaz +{ --config-name h2 } --mask-repository $rep/t7b 2>>EOE != 0;
        error: package foo/1.1.0 is orphaned
          info: explicitly upgrade it to a new version
        info: while satisfying foo/1.1.0
        EOE

      # While at it, test foo deorphaning.
      #
      $* foo +{ --deorphan } libbaz +{ --config-name h2 } --yes --plan "" \
             --mask-repository $rep/t7b 2>>~%EOE%;
          drop libbaz/1.1.0 (unused)
        %  new libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\] \(required by foo\)%
        %  new libbaz/1.0.0 \[h2.\]%
          replace/downgrade foo/1.0.0
        disfigured foo/1.1.0
        disfigured libbaz/1.1.0
        purged libbaz/1.1.0
        %fetched libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[h2.\]%
        %unpacked libbaz/1.0.0 \[h2.\]%
        fetched foo/1.0.0
        unpacked foo/1.0.0
        %configured libbuild2-bar/1.0.0 \[h1.\.bpkg.build2.\]%
        %configured libbaz/1.0.0 \[h2.\]%
        configured foo/1.0.0
        %info: h2.+libbaz-1.0.0.+ is up to date%
        %info: h1.+foo-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[h2.\]%
        updated foo/1.0.0
        EOE

      $pkg_status -d h1 -r >>/EOO
        !foo configured 1.0.0 available 1.1.0
          !libbaz [h2/] configured 1.0.0 available 1.1.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        EOO
    }

    : unhold-repointed
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, cfg, h1);

      $* foo --yes 2>!;

      $pkg_status -d h1 -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        EOO

      $rep_add -d h2 $rep/t7a && $rep_fetch -d h2;

      $* libbar ?foo libbaz +{ --config-name h2 } <<EOI 2>>~%EOE%;
        y
        EOI
          drop libbaz/1.0.0 (unused)
        %  new libbaz/1.0.0 \[h2.\]%
          reconfigure/update/unhold foo/1.0.0
          new libbar/1.0.0
        continue? [Y/n] disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        purged libbaz/1.0.0
        %fetched libbaz/1.0.0 \[h2.\]%
        %unpacked libbaz/1.0.0 \[h2.\]%
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        %configured libbaz/1.0.0 \[h2.\]%
        configured foo/1.0.0
        configured libbar/1.0.0
        %info: h2.+libbaz-1.0.0.+ is up to date%
        %info: h1.+libbar-1.0.0.+ is up to date%
        %updated libbaz/1.0.0 \[h2.\]%
        updated libbar/1.0.0
        EOE

      $pkg_status -d h1 --link -r >>/EOO
        !libbar configured 1.0.0
          foo configured 1.0.0
            !libbaz [h2/] configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          !libbaz [h2/] configured 1.0.0
        !libbaz [h2/] configured 1.0.0
        EOO
    }

    : satisfy
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h2 $rep/t7b && $rep_fetch -d h2;

      test.arguments = $regex.apply($test.arguments, cfg, h2);

      $* foo --yes 2>!;

      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, h2, h1);

      $* foo ?libbaz <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[h1..bpkg.build2.\] \(required by foo\)%
          new libbaz/1.0.0 (required by foo)
          new foo/1.0.0
        %continue\? \[Y.n\] fetched libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched foo/1.0.0
        unpacked foo/1.0.0
        %configured libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        configured libbaz/1.0.0
        configured foo/1.0.0
        %info: h1.+foo-1.0.0.+ is up to date%
        updated foo/1.0.0
        EOE

      $pkg_status -d h1 --link -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        !foo [h2/] configured 1.1.0
          libbaz [h2/] configured 1.1.0
        EOO

      $* ?libbaz/1.0.0 +{ --config-name h2 } 2>>~%EOE% != 0;
        %error: unable to downgrade package libbaz/1.1.0 \[h2.\] to 1.0.0%
        %  info: because configured package foo/1.1.0 \[h2.\] depends on \(libbaz \^1.1.0\)%
          info: re-run with -v for additional dependency information
          info: consider re-trying with --upgrade|-u potentially combined with --recursive|-r
          info: or explicitly request up/downgrade of package foo
          info: or explicitly specify package libbaz version to manually satisfy these constraints
        EOE

      $* ?libbaz +{ --config-name h2 } <<EOI 2>>~%EOE%;
        y
        n
        EOI
          drop libbaz/1.0.0 (unused)
        %  update libbaz/1.1.0 \[h2.\]%
        %  reconfigure foo/1.0.0 \(dependent of libbaz \[h2.\]\)%
        continue? [Y/n] update dependent packages? [Y/n] disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        purged libbaz/1.0.0
        configured foo/1.0.0
        EOE

      $pkg_status -d h1 --link -r >>/EOO
        !foo configured 1.0.0
          libbaz [h2/] configured 1.1.0
          libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
        !foo [h2/] configured 1.1.0
          libbaz [h2/] configured 1.1.0
        EOO
    }

    : upgrade-repointed
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbar --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbar configured 1.0.0
          foo [t1/.bpkg/host/] configured 1.0.0
            libbaz [t1/.bpkg/host/] configured 1.0.0
            libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $cfg_create -d h1 --type host --name h1 &h1/***;

      $cfg_link -d t1 h1 2>!;

      $rep_add -d t1 $rep/t7b && $rep_fetch -d t1;

      $* libbar ?foo +{ --config-name h1 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  drop libbuild2-bar/1.0.0 \[t1..bpkg.build2.\] \(unused\)%
        %  drop libbaz/1.0.0 \[t1..bpkg.host.\] \(unused\)%
        %  drop foo/1.0.0 \[t1..bpkg.host.\] \(unused\)%
        %  new libbaz/1.1.0 \[h1.\] \(required by foo \[h1.\]\)%
        %  new foo/1.1.0 \[h1.\] \(required by libbar\)%
          upgrade libbar/1.1.0
        continue? [Y/n] disfigured libbar/1.0.0
        %disfigured foo/1.0.0 \[t1..bpkg.host.\]%
        %disfigured libbaz/1.0.0 \[t1..bpkg.host.\]%
        %disfigured libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %purged libbuild2-bar/1.0.0 \[t1..bpkg.build2.\]%
        %purged libbaz/1.0.0 \[t1..bpkg.host.\]%
        %purged foo/1.0.0 \[t1..bpkg.host.\]%
        %fetched libbaz/1.1.0 \[h1.\]%
        %unpacked libbaz/1.1.0 \[h1.\]%
        %fetched foo/1.1.0 \[h1.\]%
        %unpacked foo/1.1.0 \[h1.\]%
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        %configured libbaz/1.1.0 \[h1.\]%
        %configured foo/1.1.0 \[h1.\]%
        configured libbar/1.1.0
        %info: t1.+libbar-1.1.0.+ is up to date%
        updated libbar/1.1.0
        EOE

      $pkg_status -d t1 -r >>/EOO
        !libbar configured 1.1.0
          foo [h1/] configured 1.1.0
            libbaz [h1/] configured 1.1.0
          libbaz configured 1.0.0 available 1.1.0
        EOO
    }

    : upgrade-repointed-dependency
    :
    {
      $cfg_create -d h1 --type host --name h1 &h1/***;
      $cfg_create -d h2 --type host --name h2 &h2/***;

      $cfg_link -d h1 h2;

      $rep_add -d h1 $rep/t7a && $rep_fetch -d h1;

      test.arguments = $regex.apply($test.arguments, cfg, h1);

      $* libbar --yes 2>!;

      $pkg_status -d h1 -r >>/EOO;
        !libbar configured 1.0.0
          foo configured 1.0.0
            libbaz configured 1.0.0
            libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $rep_add -d h1 $rep/t7b && $rep_fetch -d h1;

      $* libbar ?foo ?libbaz +{ --config-name h2 } <<EOI 2>>~%EOE%;
        y
        y
        EOI
        %  drop libbuild2-bar/1.0.0 \[h1..bpkg.build2.\] \(unused\)%
          drop libbaz/1.0.0 (unused)
        %  new libbaz/1.1.0 \[h2.\] \(required by foo, libbar\)%
          upgrade foo/1.1.0
          upgrade libbar/1.1.0
        continue? [Y/n] disfigured libbar/1.0.0
        disfigured foo/1.0.0
        disfigured libbaz/1.0.0
        %disfigured libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %purged libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        purged libbaz/1.0.0
        %fetched libbaz/1.1.0 \[h2.\]%
        %unpacked libbaz/1.1.0 \[h2.\]%
        fetched foo/1.1.0
        unpacked foo/1.1.0
        fetched libbar/1.1.0
        unpacked libbar/1.1.0
        %configured libbaz/1.1.0 \[h2.\]%
        configured foo/1.1.0
        configured libbar/1.1.0
        %info: h1.+libbar-1.1.0.+ is up to date%
        updated libbar/1.1.0
        EOE

      $pkg_status -d h1 -r >>/EOO
        !libbar configured 1.1.0
          foo configured 1.1.0
            libbaz [h2/] configured 1.1.0
          libbaz [h2/] configured 1.1.0
        EOO
    }

    : upgrade-prerequisite-replacement
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbar --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbar configured 1.0.0
          foo [t1/.bpkg/host/] configured 1.0.0
            libbaz [t1/.bpkg/host/] configured 1.0.0
            libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $cfg_create -d t2 --name t2 &t2/***;

      $rep_add -d t2 $rep/t7a && $rep_fetch -d t2;

      test.arguments = $regex.apply($test.arguments, t1, t2);

      $* libbaz --yes 2>!;

      $cfg_link -d t1 t2 2>!;

      $rep_add -d t2 $rep/t7b && $rep_fetch -d t2;

      test.arguments = $regex.apply($test.arguments, t2, t1);

      $* libbaz +{ --config-name t2 } <<EOI 2>>~%EOE%;
        y
        y
        EOI
          drop libbaz/1.0.0 (unused)
        %  upgrade libbaz/1.1.0 \[t2.\]%
        %  reconfigure libbar/1.0.0 \(dependent of libbaz \[t2.\]\)%
        continue? [Y/n] update dependent packages? [Y/n] disfigured libbar/1.0.0
        %disfigured libbaz/1.0.0 \[t2.\]%
        disfigured libbaz/1.0.0
        purged libbaz/1.0.0
        %fetched libbaz/1.1.0 \[t2.\]%
        %unpacked libbaz/1.1.0 \[t2.\]%
        %configured libbaz/1.1.0 \[t2.\]%
        configured libbar/1.0.0
        %info: t2.+libbaz-1.1.0.+ is up to date%
        %info: t1.+libbar-1.0.0.+ is up to date%
        %updated libbaz/1.1.0 \[t2.\]%
        updated libbar/1.0.0
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !libbar configured 1.0.0
          foo [t1/.bpkg/host/] configured 1.0.0
            libbaz [t1/.bpkg/host/] configured 1.0.0
            libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
          !libbaz [t2/] configured 1.1.0
        !libbaz [t2/] configured 1.1.0
        EOO
    }

    : copy-upgrade-dependency-tree
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libbar --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libbar configured 1.0.0
          foo [t1/.bpkg/host/] configured 1.0.0
            libbaz [t1/.bpkg/host/] configured 1.0.0
            libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        EOO

      $cfg_create -d t2 --name t2 &t2/***;

      $cfg_link -d t1 t2 2>!;

      $rep_add -d t2 $rep/t7b && $rep_fetch -d t2;

      $* libbar +{ --config-name t2 } <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbaz/1.1.0 \[t2..bpkg.host.\] \(required by foo \[t2..bpkg.host.\]\)%
        %  new foo/1.1.0 \[t2..bpkg.host.\] \(required by libbar \[t2.\]\)%
        %  new libbaz/1.1.0 \[t2.\] \(required by libbar \[t2.\]\)%
        %  new libbar/1.1.0 \[t2.\]%
        %continue\? \[Y/n\] fetched libbaz/1.1.0 \[t2..bpkg.host.\]%
        %unpacked libbaz/1.1.0 \[t2..bpkg.host.\]%
        %fetched foo/1.1.0 \[t2..bpkg.host.\]%
        %unpacked foo/1.1.0 \[t2..bpkg.host.\]%
        %fetched libbaz/1.1.0 \[t2.\]%
        %unpacked libbaz/1.1.0 \[t2.\]%
        %fetched libbar/1.1.0 \[t2.\]%
        %unpacked libbar/1.1.0 \[t2.\]%
        %configured libbaz/1.1.0 \[t2..bpkg.host.\]%
        %configured foo/1.1.0 \[t2..bpkg.host.\]%
        %configured libbaz/1.1.0 \[t2.\]%
        %configured libbar/1.1.0 \[t2.\]%
        %info: t2.+libbar-1.1.0.+ is up to date%
        %updated libbar/1.1.0 \[t2.\]%
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !libbar configured 1.0.0
          foo [t1/.bpkg/host/] configured 1.0.0
            libbaz [t1/.bpkg/host/] configured 1.0.0
            libbuild2-bar [t1/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
        !libbar [t2/] configured 1.1.0
          foo [t2/.bpkg/host/] configured 1.1.0
            libbaz [t2/.bpkg/host/] configured 1.1.0
          libbaz [t2/] configured 1.1.0
        EOO
    }

    : repointed-dependent-indirect-dependency-upgrade
    :
    {
      $cfg_create -d t1 --name t1 &t1/***;
      $cfg_create -d t2 --name t2 &t2/***;
      $cfg_create -d h1 --name h1 --type host &h1/***;

      $cfg_link -d t1 t2 2>!;
      $cfg_link -d t1 h1 2>!;
      $cfg_link -d t2 h1 2>!;

      $rep_add -d t1 $rep/t7a && $rep_fetch -d t1;

      test.arguments = $regex.apply($test.arguments, cfg, t1);

      $* libfix --yes 2>!;

      $pkg_status -d t1 -r >>/EOO;
        !libfix configured 1.0.0
          libbar configured 1.0.0
            foo [h1/] configured 1.0.0
              libbaz [h1/] configured 1.0.0
              libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          libbox configured 1.0.0
            foo [h1/] configured 1.0.0
              libbaz [h1/] configured 1.0.0
              libbuild2-bar [h1/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          libfax configured 1.0.0
        EOO

      $rep_add -d t1 $rep/t7b && $rep_fetch -d t1;
      $rep_add -d t2 $rep/t7b && $rep_fetch -d t2;
      $rep_add -d h1 $rep/t7b && $rep_fetch -d h1;

      $* libfix libfax +{ --config-name t2 } foo +{ --config-name h1 } <<EOI 2>>~%EOE%;
        y
        y
        EOI
        %  drop libfax/1.0.0 \(unused\)%
        %  new libfax/1.0.0 \[t2.\]%
        %  drop libbuild2-bar/1.0.0 \[h1..bpkg.build2.\] \(unused\)%
        %  upgrade libbaz/1.1.0 \[h1.\] \(required by foo \[h1.\]\)%
        %  upgrade foo/1.1.0 \[h1.\]%
        %  reconfigure libbar \(dependent of foo \[h1.\]\)%
        %  reconfigure libbox \(dependent of foo \[h1.\]\)%
          reconfigure/update libfix/1.0.0
        continue? [Y/n] update dependent packages? [Y/n] disfigured libfix/1.0.0
        disfigured libbox/1.0.0
        disfigured libbar/1.0.0
        %disfigured foo/1.0.0 \[h1.\]%
        %disfigured libbaz/1.0.0 \[h1.\]%
        %disfigured libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        disfigured libfax/1.0.0
        purged libfax/1.0.0
        %fetched libfax/1.0.0 \[t2.\]%
        %unpacked libfax/1.0.0 \[t2.\]%
        %purged libbuild2-bar/1.0.0 \[h1..bpkg.build2.\]%
        %fetched libbaz/1.1.0 \[h1.\]%
        %unpacked libbaz/1.1.0 \[h1.\]%
        %fetched foo/1.1.0 \[h1.\]%
        %unpacked foo/1.1.0 \[h1.\]%
        %configured libfax/1.0.0 \[t2.\]%
        %configured libbaz/1.1.0 \[h1.\]%
        %configured foo/1.1.0 \[h1.\]%
        configured libbar/1.0.0
        configured libbox/1.0.0
        configured libfix/1.0.0
        %info: t2.+libfax-1.0.0.+ is up to date%
        %info: h1.+foo-1.1.0.+ is up to date%
        %info: t1.+libfix-1.0.0.+ is up to date%
        %info: t1.+libbar-1.0.0.+ is up to date%
        %info: t1.+libbox-1.0.0.+ is up to date%
        %updated libfax/1.0.0 \[t2.\]%
        %updated foo/1.1.0 \[h1.\]%
        updated libfix/1.0.0
        updated libbar/1.0.0
        updated libbox/1.0.0
        EOE

      $pkg_status -d t1 --link -r >>/EOO
        !libfix configured 1.0.0
          libbar configured 1.0.0 available 1.1.0
            !foo [h1/] configured 1.1.0
              libbaz [h1/] configured 1.1.0
            libbaz configured 1.0.0 available 1.1.0
          libbox configured 1.0.0 available 1.1.0
            !foo [h1/] configured 1.1.0
              libbaz [h1/] configured 1.1.0
            libbaz configured 1.0.0 available 1.1.0
          !libfax [t2/] configured 1.0.0
        !libfax [t2/] configured 1.0.0
        !foo [h1/] configured 1.1.0
          libbaz [h1/] configured 1.1.0
        EOO
    }
  }

  : build2-module-dep
  :
  {
    +$clone_root_cfg && $rep_add $rep/t7a && $rep_fetch

    : private-config
    :
    {
      $clone_cfg;

      $* libbiz <<EOI 2>>~%EOE% &cfg/.bpkg/build2/*** &cfg/.bpkg/host/***;
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\] \(required by foo \[cfg..bpkg.host.\]\)%
        %  new libbaz/1.0.0 \[cfg..bpkg.host.\] \(required by foo \[cfg..bpkg.host.\]\)%
        %  new foo/1.0.0 \[cfg..bpkg.host.\] \(required by libbiz\)%
        %  new libbaz/1.0.0 \[cfg..bpkg.build2.\] \(required by libbuild2-foo \[cfg..bpkg.build2.\]\)%
        %  new libbuild2-foo/1.0.0 \[cfg..bpkg.build2.\] \(required by libbiz\)%
          new libbaz/1.0.0 (required by libbiz)
          new libbiz/1.0.0
        %continue\? \[Y/n\] fetched libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %unpacked libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %fetched foo/1.0.0 \[cfg..bpkg.host.\]%
        %unpacked foo/1.0.0 \[cfg..bpkg.host.\]%
        %fetched libbaz/1.0.0 \[cfg..bpkg.build2.\]%
        %unpacked libbaz/1.0.0 \[cfg..bpkg.build2.\]%
        %fetched libbuild2-foo/1.0.0 \[cfg..bpkg.build2.\]%
        %unpacked libbuild2-foo/1.0.0 \[cfg..bpkg.build2.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched libbiz/1.0.0
        unpacked libbiz/1.0.0
        %configured libbuild2-bar/1.0.0 \[cfg..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[cfg..bpkg.host.\]%
        %configured foo/1.0.0 \[cfg..bpkg.host.\]%
        %configured libbaz/1.0.0 \[cfg..bpkg.build2.\]%
        %configured libbuild2-foo/1.0.0 \[cfg..bpkg.build2.\]%
        configured libbaz/1.0.0
        configured libbiz/1.0.0
        %info: cfg.+libbiz-1.0.0.+ is up to date%
        updated libbiz/1.0.0
        EOE

      $pkg_status -d cfg -r >>/EOO;
        !libbiz configured 1.0.0
          foo [cfg/.bpkg/host/] configured 1.0.0
            libbaz [cfg/.bpkg/host/] configured 1.0.0
            libbuild2-bar [cfg/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-foo [cfg/.bpkg/build2/] configured 1.0.0
            libbaz [cfg/.bpkg/build2/] configured 1.0.0
        EOO

      $pkg_drop libbiz
    }

    : external-config
    :
    {
      $clone_cfg;

      $cfg_create -d cfg2 --type build2 --name cfg2 &cfg2/***;
      $cfg_link -d cfg cfg2;

      $cfg_create -d cfg3 --type host --name cfg3 &cfg3/***;
      $cfg_link -d cfg cfg3;

      $* libbiz <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbuild2-bar/1.0.0 \[cfg3..bpkg.build2.\] \(required by foo \[cfg3.\]\)%
        %  new libbaz/1.0.0 \[cfg3.\] \(required by foo \[cfg3.\]\)%
        %  new foo/1.0.0 \[cfg3.\] \(required by libbiz\)%
        %  new libbaz/1.0.0 \[cfg2.\] \(required by libbuild2-foo \[cfg2.\]\)%
        %  new libbuild2-foo/1.0.0 \[cfg2.\] \(required by libbiz\)%
          new libbaz/1.0.0 (required by libbiz)
          new libbiz/1.0.0
        %continue\? \[Y/n\] fetched libbuild2-bar/1.0.0 \[cfg3..bpkg.build2.\]%
        %unpacked libbuild2-bar/1.0.0 \[cfg3..bpkg.build2.\]%
        %fetched libbaz/1.0.0 \[cfg3.\]%
        %unpacked libbaz/1.0.0 \[cfg3.\]%
        %fetched foo/1.0.0 \[cfg3.\]%
        %unpacked foo/1.0.0 \[cfg3.\]%
        %fetched libbaz/1.0.0 \[cfg2.\]%
        %unpacked libbaz/1.0.0 \[cfg2.\]%
        %fetched libbuild2-foo/1.0.0 \[cfg2.\]%
        %unpacked libbuild2-foo/1.0.0 \[cfg2.\]%
        fetched libbaz/1.0.0
        unpacked libbaz/1.0.0
        fetched libbiz/1.0.0
        unpacked libbiz/1.0.0
        %configured libbuild2-bar/1.0.0 \[cfg3..bpkg.build2.\]%
        %configured libbaz/1.0.0 \[cfg3.\]%
        %configured foo/1.0.0 \[cfg3.\]%
        %configured libbaz/1.0.0 \[cfg2.\]%
        %configured libbuild2-foo/1.0.0 \[cfg2.\]%
        configured libbaz/1.0.0
        configured libbiz/1.0.0
        %info: cfg.+libbiz-1.0.0.+ is up to date%
        updated libbiz/1.0.0
        EOE

      $pkg_status -d cfg -r >>/EOO;
        !libbiz configured 1.0.0
          foo [cfg3/] configured 1.0.0
            libbaz [cfg3/] configured 1.0.0
            libbuild2-bar [cfg3/.bpkg/build2/] configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-foo [cfg2/] configured 1.0.0
            libbaz [cfg2/] configured 1.0.0
        EOO

      $pkg_drop libbiz
    }

    : build2-config
    :
    {
      $cfg_create -d cfg --type build2 &cfg/***;
      $rep_add $rep/t7a && $rep_fetch;

      $* libbiz 2>>EOE != 0
        error: build-time dependency foo in build system module configuration
          info: build system modules cannot have build-time dependencies
        info: while satisfying libbiz/1.0.0
        EOE
    }

    : duplicates
    :
    {
      $cfg_create -d cfg &cfg/***;

      $cfg_create -d cfg2 --name cfg2 &cfg2/***;
      $cfg_link -d cfg cfg2;

      $cfg_create -d cfg3 --name cfg3 &cfg3/***;
      $cfg_link -d cfg cfg3;

      $* "libbiz@$rep/t7a" +{ --config-name cfg2 } --yes --trust-yes 2>!;
      $* "libbuz@$rep/t7a" +{ --config-name cfg3 } --yes --trust-yes 2>!;

      $* "libbix@$rep/t7a" --trust-yes 2>>/~%EOE% != 0
        %(added|fetching).+%{2}
        error: building build system module libbuild2-bar in multiple configurations
        %  info: cfg(2|3)/.bpkg/build2/%{2}
        EOE
    }
  }

  : multiple-configs
  :
  {
    cfg_uuid  = '18f48b4b-b5d9-4712-b98c-1930df1c4228'
    cfg2_uuid = '28f48b4b-b5d9-4712-b98c-1930df1c4228'
    cfg3_uuid = '38f48b4b-b5d9-4712-b98c-1930df1c4228'
    cfg4_uuid = '48f48b4b-b5d9-4712-b98c-1930df1c4228'
    cfg5_uuid = '58f48b4b-b5d9-4712-b98c-1930df1c4228'

    : 2-current-configs
    :
    {
      $cfg_create -d cfg  --uuid $cfg_uuid                &cfg/***;
      $cfg_create -d cfg2 --uuid $cfg2_uuid               &cfg2/***;
      $cfg_create -d cfg3 --uuid $cfg3_uuid --type build2 &cfg3/***;

      $cfg_link -d cfg  cfg3;
      $cfg_link -d cfg2 cfg3;

      $rep_add         $rep/t7a && $rep_fetch;
      $rep_add -d cfg2 $rep/t7a && $rep_fetch -d cfg2;

      test.arguments += -d cfg2; # Now refers 2 current dirs: cfg/ and cfg2/.

      # While at it, make sure --config-uuid is only allowed for multiple
      # current configurations.
      #
      $* foo +{ --config-id 1 } 2>>EOE != 0;
        error: --config-id specified for multiple current configurations
          info: use --config-uuid to specify configurations in this mode
          info: while validating options for foo
        EOE

      $* foo +{ --config-name cfg2 } 2>>EOE != 0;
        error: --config-name specified for multiple current configurations
          info: use --config-uuid to specify configurations in this mode
          info: while validating options for foo
        EOE

      # While at it, make sure a package must have the configuration
      # specified.
      #
      $* foo 2>>EOE != 0;
        error: no configuration specified for foo
          info: configuration must be explicitly specified for each package in multi-configurations mode
          info: use --config-uuid to specify its configuration
        EOE

      # Build foo in cfg/ and cfg2/ with its libbaz dependency colocated and
      # libbuild2-bar dependency shared in cfg3/.
      #
      $* foo +{ --config-uuid $cfg_uuid --config-uuid $cfg2_uuid } <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbaz/1.0.0 \[cfg.\] \(required by foo \[cfg.\]\)%
        %  new libbuild2-bar/1.0.0 \[cfg3.\] \(required by foo \[cfg.\], foo \[cfg2.\]\)%
        %  new foo/1.0.0 \[cfg.\]%
        %  new libbaz/1.0.0 \[cfg2.\] \(required by foo \[cfg2.\]\)%
        %  new foo/1.0.0 \[cfg2.\]%
        %continue\? \[Y/n\] fetched libbaz/1.0.0 \[cfg.\]%
        %unpacked libbaz/1.0.0 \[cfg.\]%
        %fetched libbuild2-bar/1.0.0 \[cfg3.\]%
        %unpacked libbuild2-bar/1.0.0 \[cfg3.\]%
        %fetched foo/1.0.0 \[cfg.\]%
        %unpacked foo/1.0.0 \[cfg.\]%
        %fetched libbaz/1.0.0 \[cfg2.\]%
        %unpacked libbaz/1.0.0 \[cfg2.\]%
        %fetched foo/1.0.0 \[cfg2.\]%
        %unpacked foo/1.0.0 \[cfg2.\]%
        %configured libbaz/1.0.0 \[cfg.\]%
        %configured libbuild2-bar/1.0.0 \[cfg3.\]%
        %configured foo/1.0.0 \[cfg.\]%
        %configured libbaz/1.0.0 \[cfg2.\]%
        %configured foo/1.0.0 \[cfg2.\]%
        %info: cfg.+foo-1.0.0.+ is up to date%
        %info: cfg2.+foo-1.0.0.+ is up to date%
        %updated foo/1.0.0 \[cfg.\]%
        %updated foo/1.0.0 \[cfg2.\]%
        EOE

      $pkg_status -d cfg -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [cfg3/] configured 1.0.0
        EOO

      $pkg_status -d cfg2 -r >>/EOO;
        !foo configured 1.0.0
          libbaz configured 1.0.0
          libbuild2-bar [cfg3/] configured 1.0.0
        EOO

      # Move libbuild2-bar to cfg4/ and libbaz to cfg5/.
      #
      $cfg_create -d cfg4 --uuid $cfg4_uuid --type build2 &cfg4/***;
      $cfg_create -d cfg5 --uuid $cfg5_uuid               &cfg5/***;

      $cfg_link -d cfg  cfg4;
      $cfg_link -d cfg2 cfg4;
      $cfg_link -d cfg  cfg5;
      $cfg_link -d cfg2 cfg5;

      $* ?libbuild2-bar +{ --config-uuid $cfg4_uuid } \
         ?libbaz +{ --config-uuid $cfg5_uuid } <<EOI 2>>~%EOE%;
        y
        y
        EOI
        %  drop libbaz/1.0.0 \[cfg2.\] \(unused\)%
        %  drop libbuild2-bar/1.0.0 \[cfg3.\] \(unused\)%
        %  drop libbaz/1.0.0 \[cfg.\] \(unused\)%
        %  new libbuild2-bar/1.0.0 \[cfg4.\] \(required by foo \[cfg.\], foo \[cfg2.\]\)%
        %  new libbaz/1.0.0 \[cfg5.\] \(required by foo \[cfg.\], foo \[cfg2.\]\)%
        %  reconfigure foo/1.0.0 \[cfg2.\] \(dependent of libbaz \[cfg5.\], libbuild2-bar \[cfg4.\]\)%
        %  reconfigure foo/1.0.0 \[cfg.\] \(dependent of libbaz \[cfg5.\], libbuild2-bar \[cfg4.\]\)%
        %continue\? \[Y/n\] update dependent packages\? \[Y/n\] disfigured foo/1.0.0 \[cfg.\]%
        %disfigured foo/1.0.0 \[cfg2.\]%
        %disfigured libbaz/1.0.0 \[cfg.\]%
        %disfigured libbuild2-bar/1.0.0 \[cfg3.\]%
        %disfigured libbaz/1.0.0 \[cfg2.\]%
        %purged libbaz/1.0.0 \[cfg2.\]%
        %purged libbuild2-bar/1.0.0 \[cfg3.\]%
        %purged libbaz/1.0.0 \[cfg.\]%
        %fetched libbuild2-bar/1.0.0 \[cfg4.\]%
        %unpacked libbuild2-bar/1.0.0 \[cfg4.\]%
        %fetched libbaz/1.0.0 \[cfg5.\]%
        %unpacked libbaz/1.0.0 \[cfg5.\]%
        %configured libbuild2-bar/1.0.0 \[cfg4.\]%
        %configured libbaz/1.0.0 \[cfg5.\]%
        %configured foo/1.0.0 \[cfg2.\]%
        %configured foo/1.0.0 \[cfg.\]%
        %info: cfg2.+foo-1.0.0.+ is up to date%
        %info: cfg.+foo-1.0.0.+ is up to date%
        %updated foo/1.0.0 \[cfg2.\]%
        %updated foo/1.0.0 \[cfg.\]%
        EOE

      $pkg_status -d cfg -r >>/EOO;
        !foo configured 1.0.0
          libbaz [cfg5/] configured 1.0.0
          libbuild2-bar [cfg4/] configured 1.0.0
        EOO

      $pkg_status -d cfg2 -r >>/EOO;
        !foo configured 1.0.0
          libbaz [cfg5/] configured 1.0.0
          libbuild2-bar [cfg4/] configured 1.0.0
        EOO

      $rep_add $rep/t7b && $rep_fetch;

      $* foo ?libbaz --config-uuid $cfg_uuid <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbaz/1.1.0 \[cfg.\] \(required by foo \[cfg.\]\)%
        %  upgrade foo/1.1.0 \[cfg.\]%
        %continue\? \[Y/n\] disfigured foo/1.0.0 \[cfg.\]%
        %fetched libbaz/1.1.0 \[cfg.\]%
        %unpacked libbaz/1.1.0 \[cfg.\]%
        %fetched foo/1.1.0 \[cfg.\]%
        %unpacked foo/1.1.0 \[cfg.\]%
        %configured libbaz/1.1.0 \[cfg.\]%
        %configured foo/1.1.0 \[cfg.\]%
        %info: cfg.+foo-1.1.0.+ is up to date%
        %updated foo/1.1.0 \[cfg.\]%
        EOE

      $pkg_status -d cfg -r >>/EOO;
        !foo configured 1.1.0
          libbaz configured 1.1.0
        EOO

      $pkg_status -d cfg2 -r >>/EOO;
        !foo configured 1.0.0
          libbaz [cfg5/] configured 1.0.0
          libbuild2-bar [cfg4/] configured 1.0.0
        EOO

      $rep_add -d cfg2 $rep/t7b && $rep_fetch -d cfg2;

      $* --no-move foo +{ --config-uuid $cfg2_uuid } \
         ?libbaz +{ --config-uuid $cfg5_uuid } <<EOI 2>>~%EOE%;
        y
        EOI
        %  drop libbuild2-bar/1.0.0 \[cfg4.\] \(unused\)%
        %  upgrade libbaz/1.1.0 \[cfg5.\]%
        %  upgrade foo/1.1.0 \[cfg2.\]%
        %continue\? \[Y/n\] disfigured foo/1.0.0 \[cfg2.\]%
        %disfigured libbaz/1.0.0 \[cfg5.\]%
        %disfigured libbuild2-bar/1.0.0 \[cfg4.\]%
        %purged libbuild2-bar/1.0.0 \[cfg4.\]%
        %fetched libbaz/1.1.0 \[cfg5.\]%
        %unpacked libbaz/1.1.0 \[cfg5.\]%
        %fetched foo/1.1.0 \[cfg2.\]%
        %unpacked foo/1.1.0 \[cfg2.\]%
        %configured libbaz/1.1.0 \[cfg5.\]%
        %configured foo/1.1.0 \[cfg2.\]%
        %info: cfg2.+foo-1.1.0.+ is up to date%
        %updated foo/1.1.0 \[cfg2.\]%
        EOE

      $pkg_status -d cfg2 -r >>/EOO
        !foo configured 1.1.0
          libbaz [cfg5/] configured 1.1.0
        EOO
    }

    : variable
    :
    {
      $cfg_create -d cfg  --uuid $cfg_uuid              &cfg/***;
      $cfg_create -d cfg2 --uuid $cfg2_uuid             &cfg2/***;
      $cfg_create -d cfg3 --uuid $cfg3_uuid --type host &cfg3/***;

      $cfg_link -d cfg  cfg3;
      $cfg_link -d cfg2 cfg3;

      $rep_add         $rep/t7a && $rep_fetch;
      $rep_add -d cfg2 $rep/t7a && $rep_fetch -d cfg2;

      test.arguments += -d cfg2; # Now refers 2 current dirs: cfg/ and cfg2/.

      $* --configure-only \
         { --config-uuid $cfg_uuid  config.libbaz=true }+ libbaz \
         { --config-uuid $cfg2_uuid                    }+ libbaz 2>!;

      sed -n -e 's/^config.libbaz = (.+)$/\1/p' \
          cfg/libbaz-1.0.0/build/config.build >'true';

      sed -n -e 's/^config.libbaz = (.+)$/\1/p' \
          cfg2/libbaz-1.0.0/build/config.build >'false'
    }

    : system-dependency
    :
    {
      $cfg_create -d cfg  --uuid $cfg_uuid              &cfg/***;
      $cfg_create -d cfg2 --uuid $cfg2_uuid             &cfg2/***;
      $cfg_create -d cfg3 --uuid $cfg3_uuid --type host &cfg3/***;

      $cfg_link -d cfg  cfg3;
      $cfg_link -d cfg2 cfg3;

      $rep_add         $rep/t7a && $rep_fetch;
      $rep_add -d cfg2 $rep/t7a && $rep_fetch -d cfg2;

      test.arguments += -d cfg2; # Now refers 2 current dirs: cfg/ and cfg2/.

      $* libbox +{ --config-uuid $cfg_uuid  --config-uuid $cfg2_uuid } \
         '?sys:foo' <<EOI 2>>~%EOE%;
        y
        EOI
        %  new libbaz/1.0.0 \[cfg.\] \(required by libbox \[cfg.\]\)%
        %  configure sys:foo/\* \[cfg3.\] \(required by libbox \[cfg.\], libbox \[cfg2.\]\)%
        %  new libbox/1.0.0 \[cfg.\]%
        %  new libbaz/1.0.0 \[cfg2.\] \(required by libbox \[cfg2.\]\)%
        %  new libbox/1.0.0 \[cfg2.\]%
        %continue\? \[Y/n\] fetched libbaz/1.0.0 \[cfg.\]%
        %unpacked libbaz/1.0.0 \[cfg.\]%
        %fetched libbox/1.0.0 \[cfg.\]%
        %unpacked libbox/1.0.0 \[cfg.\]%
        %fetched libbaz/1.0.0 \[cfg2.\]%
        %unpacked libbaz/1.0.0 \[cfg2.\]%
        %fetched libbox/1.0.0 \[cfg2.\]%
        %unpacked libbox/1.0.0 \[cfg2.\]%
        %configured libbaz/1.0.0 \[cfg.\]%
        %configured sys:foo/\* \[cfg3.\]%
        %configured libbox/1.0.0 \[cfg.\]%
        %configured libbaz/1.0.0 \[cfg2.\]%
        %configured libbox/1.0.0 \[cfg2.\]%
        %info: cfg.+libbox-1.0.0.+ is up to date%
        %info: cfg2.+libbox-1.0.0.+ is up to date%
        %updated libbox/1.0.0 \[cfg.\]%
        %updated libbox/1.0.0 \[cfg2.\]%
        EOE

      $pkg_status -d cfg -r >>/EOO;
        !libbox configured 1.0.0
          foo [cfg3/] configured,system !* available 1.0.0
          libbaz configured 1.0.0
        EOO

      $pkg_status -d cfg2 -r >>/EOO
        !libbox configured 1.0.0
          foo [cfg3/] configured,system !* available 1.0.0
          libbaz configured 1.0.0
        EOO
    }

    : build2-module-different-clusters
    :
    : Test that the same module can successfully be built in 2 configurations
    : if they belong to different linked configuration clusters.
    :
    {
      $cfg_create -d cfg  --uuid $cfg_uuid  &cfg/***;
      $cfg_create -d cfg2 --uuid $cfg2_uuid &cfg2/***;

      test.arguments += -d cfg2; # Now refers 2 current dirs: cfg/ and cfg2/.

      $* "libbiz@$rep/t7a" +{ --config-uuid $cfg_uuid  } \
         "libbuz@$rep/t7a" +{ --config-uuid $cfg2_uuid } --yes --trust-yes 2>>~%EOE%
        %(added|fetching) .+%{4}
        %(fetched|unpacked) .+%{26}
        %configured .+%{13}
        %info: .+ is up to date%{2}
        %updated .+%{2}
        EOE
    }
  }

  : system
  :
  {
    +$clone_root_cfg && $rep_add $rep/t7a && $rep_fetch

    : no-config
    :
    {
      +$clone_cfg

      : linked
      :
      {
        $clone_cfg;

        $cfg_create -d cfg2 --type host --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $* libbox '?sys:foo' <<EOI 2>>~%EOE%;
          y
          EOI
          %  configure sys:foo/\* \[cfg2.\] \(required by libbox\)%
            new libbaz/1.0.0 (required by libbox)
            new libbox/1.0.0
          continue? [Y/n] fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched libbox/1.0.0
          unpacked libbox/1.0.0
          %configured sys:foo/\* \[cfg2.\]%
          configured libbaz/1.0.0
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }

      : private-host
      :
      {
        $clone_cfg;

        $* libbox '?sys:foo' &cfg/.bpkg/host/*** <<EOI 2>>~%EOE%;
          y
          EOI
          %  configure sys:foo/\* \[cfg..bpkg.host.\] \(required by libbox\)%
            new libbaz/1.0.0 (required by libbox)
            new libbox/1.0.0
          continue? [Y/n] fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched libbox/1.0.0
          unpacked libbox/1.0.0
          %configured sys:foo/\* \[cfg..bpkg.host.\]%
          configured libbaz/1.0.0
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg/.bpkg/host/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }

      : private-module
      :
      {
        $clone_cfg;

        $* libbox '?sys:libbuild2-bar' &cfg/.bpkg/host/*** &cfg/.bpkg/build2/*** <<EOI 2>>~%EOE%;
          y
          EOI
          %  configure sys:libbuild2-bar/\* \[cfg..bpkg.build2.\] \(required by foo \[cfg..bpkg.host.\]\)%
          %  new libbaz/1.0.0 \[cfg..bpkg.host.\] \(required by foo \[cfg..bpkg.host.\]\)%
          %  new foo/1.0.0 \[cfg..bpkg.host.\] \(required by libbox\)%
            new libbaz/1.0.0 (required by libbox)
            new libbox/1.0.0
          %continue\? \[Y/n\] fetched libbaz/1.0.0 \[cfg..bpkg.host.\]%
          %unpacked libbaz/1.0.0 \[cfg..bpkg.host.\]%
          %fetched foo/1.0.0 \[cfg..bpkg.host.\]%
          %unpacked foo/1.0.0 \[cfg..bpkg.host.\]%
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched libbox/1.0.0
          unpacked libbox/1.0.0
          %configured sys:libbuild2-bar/\* \[cfg..bpkg.build2.\]%
          %configured libbaz/1.0.0 \[cfg..bpkg.host.\]%
          %configured foo/1.0.0 \[cfg..bpkg.host.\]%
          configured libbaz/1.0.0
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg/.bpkg/host/] configured 1.0.0
              libbaz [cfg/.bpkg/host/] configured 1.0.0
              libbuild2-bar [cfg/.bpkg/build2/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }
    }

    : config
    :
    {
      +$clone_cfg

      : linked
      :
      {
        $clone_cfg;

        $cfg_create -d cfg2 --type host --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $cfg_create -d cfg3 --type host --name cfg3 &cfg3/***;
        $cfg_link -d cfg cfg3;

        $* libbox '?sys:foo' +{ --config-name cfg3 } <<EOI 2>>~%EOE%;
          y
          EOI
          %  configure sys:foo/\* \[cfg3.\] \(required by libbox\)%
            new libbaz/1.0.0 (required by libbox)
            new libbox/1.0.0
          continue? [Y/n] fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          fetched libbox/1.0.0
          unpacked libbox/1.0.0
          %configured sys:foo/\* \[cfg3.\]%
          configured libbaz/1.0.0
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg3/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }

      : src-sys
      :
      {
        $clone_cfg;

        $cfg_create -d cfg2 --type host --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $* libbox --yes 2>!;

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured 1.0.0
              libbaz [cfg2/] configured 1.0.0
              libbuild2-bar [cfg2/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          EOO

        $* '?sys:foo' <<EOI 2>>~%EOE%;
          y
          y
          EOI
          %  drop libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\] \(unused\)%
          %  drop libbaz/1.0.0 \[cfg2.\] \(unused\)%
          %  reconfigure sys:foo/\* \[cfg2.\]%
          %  reconfigure libbox \(dependent of foo \[cfg2.\]\)%
          continue? [Y/n] update dependent packages? [Y/n] disfigured libbox/1.0.0
          %disfigured foo/1.0.0 \[cfg2.\]%
          %disfigured libbaz/1.0.0 \[cfg2.\]%
          %disfigured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbaz/1.0.0 \[cfg2.\]%
          %purged foo/1.0.0 \[cfg2.\]%
          %configured sys:foo/\* \[cfg2.\]%
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }

      : src-sys-upgrade
      :
      {
        $clone_cfg;

        $cfg_create -d cfg2 --type host --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $* libbox --yes 2>!;

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured 1.0.0
              libbaz [cfg2/] configured 1.0.0
              libbuild2-bar [cfg2/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          EOO

        $* '?sys:foo/1.1.0' <<EOI 2>>~%EOE%;
          y
          y
          EOI
          %  drop libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\] \(unused\)%
          %  drop libbaz/1.0.0 \[cfg2.\] \(unused\)%
          %  reconfigure sys:foo/1.1.0 \[cfg2.\]%
          %  reconfigure libbox \(dependent of foo \[cfg2.\]\)%
          continue? [Y/n] update dependent packages? [Y/n] disfigured libbox/1.0.0
          %disfigured foo/1.0.0 \[cfg2.\]%
          %disfigured libbaz/1.0.0 \[cfg2.\]%
          %disfigured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbaz/1.0.0 \[cfg2.\]%
          %purged foo/1.0.0 \[cfg2.\]%
          %configured sys:foo/1.1.0 \[cfg2.\]%
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured,system !1.1.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }

      : src-sys-unhold
      :
      {
        $clone_cfg;

        $cfg_create -d cfg2 --type host --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $rep_add -d cfg2 $rep/t7a && $rep_fetch -d cfg2;

        $* libbox foo +{ --config-name cfg2 } --yes 2>!;

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            !foo [cfg2/] configured 1.0.0
              libbaz [cfg2/] configured 1.0.0
              libbuild2-bar [cfg2/.bpkg/build2/] configured 1.0.0
            libbaz configured 1.0.0
          EOO

        $* '?sys:foo' <<EOI 2>>~%EOE%;
          y
          y
          EOI
          %  drop libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\] \(unused\)%
          %  drop libbaz/1.0.0 \[cfg2.\] \(unused\)%
          %  reconfigure/unhold sys:foo/\* \[cfg2.\]%
          %  reconfigure libbox \(dependent of foo \[cfg2.\]\)%
          continue? [Y/n] update dependent packages? [Y/n] disfigured libbox/1.0.0
          %disfigured foo/1.0.0 \[cfg2.\]%
          %disfigured libbaz/1.0.0 \[cfg2.\]%
          %disfigured libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbuild2-bar/1.0.0 \[cfg2..bpkg.build2.\]%
          %purged libbaz/1.0.0 \[cfg2.\]%
          %purged foo/1.0.0 \[cfg2.\]%
          %configured sys:foo/\* \[cfg2.\]%
          configured libbox/1.0.0
          %info: cfg.+libbox-1.0.0.+ is up to date%
          updated libbox/1.0.0
          EOE

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }

      : sys-unhold
      :
      {
        $clone_cfg;

        $cfg_create -d cfg2 --type host --name cfg2 &cfg2/***;
        $cfg_link -d cfg cfg2;

        $rep_add -d cfg2 $rep/t7a && $rep_fetch -d cfg2;

        $* libbox 'sys:foo' +{ --config-name cfg2 } --yes 2>!;

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            !foo [cfg2/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $* '?sys:foo';

        $pkg_status -r >>/EOO;
          !libbox configured 1.0.0
            foo [cfg2/] configured,system !* available 1.0.0
            libbaz configured 1.0.0
          EOO

        $pkg_drop libbox
      }
    }
  }
}

: deorphan
:
{
  test.arguments += --yes --plan ""

  : dependency
  :
  {
    : unhold
    :
    {
      : basics
      :
      {
        $clone_root_cfg;

        cp -r $src/libfoo-1.1.0 libfoo;
        $rep_add --type dir libfoo/ && $rep_fetch;

        $* libfoo 2>!;
        $rep_fetch $rep/t4b;

        $* libbar 2>!;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0
          EOO

        echo "" >+ libfoo/manifest;
        $rep_fetch;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0 available 1.1.0#1
          EOO

        # Deorphan libfoo/1.1.0 to libfoo/1.1.0#1.
        #
        # Note that libfoo/1.1.0 is considered as an orphan since its version
        # is replaced with 1.1.0#1 in its existing repository fragment. This is
        # in contrast to the subsequent tests where the package repository is
        # removed.
        #
        $* --deorphan libfoo 2>>~%EOE%;
            replace/upgrade libfoo/1.1.0#1
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0
          using libfoo/1.1.0#1 (external)
          configured libfoo/1.1.0#1
          configured libbar/1.1.0
          %info: .+libfoo.+ is up to date%
          %info: .+libbar-1.1.0.+ is up to date%
          updated libfoo/1.1.0#1
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        # Noop.
        #
        $* --deorphan libfoo 2>'info: nothing to build';

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        # Deorphan libfoo/1.1.0#1 to ?libfoo/1.1.0.
        #
        $rep_remove $~/libfoo/;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade/unhold libfoo/1.1.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0#1
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          %info: .+libbar-1.1.0.+ is up to date%
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0
          EOO

        # Deorphan libfoo/1.1.0#1 to ?libfoo/1.1.0.
        #
        $rep_add --type dir libfoo/ && $rep_fetch;
        $* libfoo 2>!;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        $rep_remove $~/libfoo/;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade/unhold libfoo/1.1.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0#1
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          %info: .+libbar-1.1.0.+ is up to date%
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0
          EOO

        $pkg_drop libbar
      }

      : basics-masked
      :
      : As above but using --mask-repository* instead of rep-remove.
      :
      {
        $clone_root_cfg;

        cp -r $src/libfoo-1.1.0 libfoo;
        $rep_add --type dir libfoo/ && $rep_fetch;

        $* libfoo 2>!;
        $rep_fetch $rep/t4b;

        $* libbar 2>!;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0
          EOO

        echo "" >+ libfoo/manifest;
        $rep_fetch;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0 available 1.1.0#1
          EOO

        # Deorphan libfoo/1.1.0 to libfoo/1.1.0#1.
        #
        # Note that libfoo/1.1.0 is considered as an orphan since its version
        # is replaced with 1.1.0#1 in its existing repository fragment. This is
        # in contrast to the subsequent tests where the package repository is
        # removed.
        #
        $* --deorphan libfoo 2>>~%EOE%;
            replace/upgrade libfoo/1.1.0#1
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0
          using libfoo/1.1.0#1 (external)
          configured libfoo/1.1.0#1
          configured libbar/1.1.0
          %info: .+libfoo.+ is up to date%
          %info: .+libbar-1.1.0.+ is up to date%
          updated libfoo/1.1.0#1
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        # Noop.
        #
        $* --deorphan libfoo 2>'info: nothing to build';

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        # Deorphan libfoo/1.1.0#1 to ?libfoo/1.1.0.
        #
        # Note that on Windows the local repository canonical name path part
        # is converted to lower case.
        #
        cn = "$canonicalize([dir_path] $~/libfoo)";
        if! $posix
          cn = $lcase([string] $cn)
        end;
        cn = "dir:$cn";

        $* --mask-repository $cn --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade/unhold libfoo/1.1.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0#1
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          %info: .+libbar-1.1.0.+ is up to date%
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0 available 1.1.0#1
          EOO

        # Noop.
        #
        $* --mask-repository-uuid "$cfg_uuid=$cn" --deorphan ?libfoo;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0 available 1.1.0#1
          EOO

        # Deorphan libfoo/1.1.0#1 to ?libfoo/1.1.0.
        #
        $* libfoo 2>!;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        $* --mask-repository $cn --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade/unhold libfoo/1.1.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0#1
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          %info: .+libbar-1.1.0.+ is up to date%
          updated libbar/1.1.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0 available 1.1.0#1
          EOO

        # Noop.
        #
        $* --mask-repository $cn --deorphan ?libfoo;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            libfoo configured 1.1.0 available 1.1.0#1
          EOO

        $pkg_drop libbar
      }

      : drop
      :
      {
        $clone_root_cfg;

        cp -r $src/libfoo-1.1.0 libfoo;
        $rep_add --type dir libfoo/ && $rep_fetch;

        $* libfoo 2>!;
        $rep_fetch $rep/t4b;

        $* libbar 2>!;

        echo "" >+ libfoo/manifest;
        $rep_fetch;
        $* libfoo 2>!;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        $rep_remove $~/libfoo/;

        $* --deorphan ?libfoo ?libbar 2>>EOE;
            drop libfoo/1.1.0#1 (unused)
            drop libbar/1.1.0 (unused)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0#1
          purged libfoo/1.1.0#1
          purged libbar/1.1.0
          EOE

        $pkg_status -ar 2>'info: no packages in the configuration'
      }

      : drop-masked
      :
      : As above but using --mask-repository instead of rep-remove.
      :
      {
        $clone_root_cfg;

        cp -r $src/libfoo-1.1.0 libfoo;
        $rep_add --type dir libfoo/ && $rep_fetch;

        $* libfoo 2>!;
        $rep_fetch $rep/t4b;

        $* libbar 2>!;

        echo "" >+ libfoo/manifest;
        $rep_fetch;
        $* libfoo 2>!;

        $pkg_status -r libbar >>EOO;
          !libbar configured 1.1.0
            !libfoo configured 1.1.0#1
          EOO

        # Note that on Windows the local repository canonical name path part
        # is converted to lower case.
        #
        cn = "$canonicalize([dir_path] $~/libfoo)";
        if! $posix
          cn = $lcase([string] $cn)
        end;
        cn = "dir:$cn";

        $* --mask-repository $cn --deorphan ?libfoo ?libbar 2>>EOE;
            drop libfoo/1.1.0#1 (unused)
            drop libbar/1.1.0 (unused)
          disfigured libbar/1.1.0
          disfigured libfoo/1.1.0#1
          purged libfoo/1.1.0#1
          purged libbar/1.1.0
          EOE

        $pkg_status -ar 2>'info: no packages in the configuration'
      }

      : no-dependent
      :
      {
        $clone_root_cfg;

        cp -r $src/libfoo-1.1.0 libfoo;
        $rep_add --type dir libfoo/ && $rep_fetch;

        echo "" >+ libfoo/manifest;
        $rep_fetch;
        $* libfoo 2>!;

        $rep_fetch $rep/t4b;
        $rep_remove $~/libfoo/;

        $pkg_status libfoo >'!libfoo configured 1.1.0';

        $* --deorphan ?libfoo 2>>EOE;
            drop libfoo/1.1.0 (unused)
          disfigured libfoo/1.1.0
          purged libfoo/1.1.0
          EOE

        $pkg_status -ar 2>'info: no packages in the configuration'
      }

      : no-dependent-masked
      :
      : As above but using --mask-repository instead of rep-remove.
      :
      {
        $clone_root_cfg;

        cp -r $src/libfoo-1.1.0 libfoo;
        $rep_add --type dir libfoo/ && $rep_fetch;

        echo "" >+ libfoo/manifest;
        $rep_fetch;
        $* libfoo 2>!;

        $rep_fetch $rep/t4b;

        $pkg_status libfoo >'!libfoo configured 1.1.0';

        # Note that on Windows the local repository canonical name path part
        # is converted to lower case.
        #
        cn = "$canonicalize([dir_path] $~/libfoo)";
        if! $posix
          cn = $lcase([string] $cn)
        end;
        cn = "dir:$cn";

        $* --mask-repository $cn --deorphan ?libfoo 2>>EOE;
            drop libfoo/1.1.0 (unused)
          disfigured libfoo/1.1.0
          purged libfoo/1.1.0
          EOE

        $pkg_status -ar 2>'info: no packages in the configuration'
      }

      : preference
      :
      {
        $clone_root_cfg;

        $tar -xf $src/t14d/libfoo-1.1.0+2.tar.gz &libfoo-1.1.0+2/***;
        mv libfoo-1.1.0+2 libfoo;

        $rep_add --type dir libfoo/ && $rep_fetch;

        $* libfoo 2>!;

        $tar -xf $src/t2/libbar-1.0.0.tar.gz &libbar-1.0.0/***;
        mv libbar-1.0.0 libbar;

        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          :
          location: $rep/t14b
          role: prerequisite
          :
          location: $rep/t14c
          role: prerequisite
          :
          location: $rep/t14d
          role: prerequisite
          :
          location: $rep/t14e
          role: prerequisite
          :
          location: $rep/t14f
          role: prerequisite
          :
          location: $rep/t14i
          role: prerequisite
          EOI

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            !libfoo configured 1.1.0+2 available [1.2.0] [1.1.1] [1.1.0+3] (1.1.0+2) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Deorphan/unhold libfoo/1.1.0+2 to the exactly same version.
        #
        $rep_remove $~/libfoo/;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/update/unhold libfoo/1.1.0+2
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0+2
          fetched libfoo/1.1.0+2
          unpacked libfoo/1.1.0+2
          configured libfoo/1.1.0+2
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0+2 available [1.2.0] [1.1.1] [1.1.0+3] (1.1.0+2) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0+2 available [1.2.0] [1.1.1] [1.1.0+3] (1.1.0+2) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Deorphan libfoo/1.1.0+2 to the later revision of same version
        # (1.1.0+3).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          :
          location: $rep/t14b
          role: prerequisite
          :
          location: $rep/t14c
          role: prerequisite
          :
          location: $rep/t14e
          role: prerequisite
          :
          location: $rep/t14f
          role: prerequisite
          :
          location: $rep/t14i
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/upgrade libfoo/1.1.0+3
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0+2
          fetched libfoo/1.1.0+3
          unpacked libfoo/1.1.0+3
          configured libfoo/1.1.0+3
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0+3 available [1.2.0] [1.1.1] (1.1.0+3) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0+3 available [1.2.0] [1.1.1] (1.1.0+3) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Deorphan libfoo/1.1.0+3 to the later patch of same version (1.1.1).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          :
          location: $rep/t14b
          role: prerequisite
          :
          location: $rep/t14c
          role: prerequisite
          :
          location: $rep/t14f
          role: prerequisite
          :
          location: $rep/t14i
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/upgrade libfoo/1.1.1
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0+3
          fetched libfoo/1.1.1
          unpacked libfoo/1.1.1
          configured libfoo/1.1.1
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.1 available [1.2.0] (1.1.1) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.1 available [1.2.0] (1.1.1) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Deorphan libfoo/1.1.1 to later minor of same version (1.2.0).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          :
          location: $rep/t14b
          role: prerequisite
          :
          location: $rep/t14c
          role: prerequisite
          :
          location: $rep/t14i
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/upgrade libfoo/1.2.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.1
          fetched libfoo/1.2.0
          unpacked libfoo/1.2.0
          configured libfoo/1.2.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.2.0 available (1.2.0) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.2.0 available (1.2.0) [1.1.0+1] [1.1.0] [1.0.0]
          EOO

        # Deorphan libfoo/1.2.0 to latest available version (1.1.0+1).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          :
          location: $rep/t14b
          role: prerequisite
          :
          location: $rep/t14c
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade libfoo/1.1.0+1
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.2.0
          fetched libfoo/1.1.0+1
          unpacked libfoo/1.1.0+1
          configured libfoo/1.1.0+1
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0+1 available (1.1.0+1) [1.1.0] [1.0.0]
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        # Deorphan libfoo/1.1.0+1 to latest available version (1.1.0).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          :
          location: $rep/t14b
          role: prerequisite
          EOI

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0+1 available (1.1.0+1) [1.1.0] [1.0.0]
          EOO

        $rep_fetch;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade libfoo/1.1.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0+1
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0 available (1.1.0) [1.0.0]
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.1.0 available (1.1.0) [1.0.0]
          EOO

        # Deorphan libfoo/1.1.0 to latest available version (1.0.0).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14a
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.0.0 available (1.0.0)
          EOO

        # Noop.
        #
        $* --deorphan ?libfoo;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.0.0 available (1.0.0)
          EOO

        # Deorphan fails (none available).
        #
        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          EOI

        $rep_fetch;

        $* --deorphan ?libfoo 2>>/EOE != 0;
          error: unknown package libfoo
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured 1.0.0
          EOO

        $pkg_drop libbar
      }
    }

    : recursive
    :
    {
      +$tar -xf $src/t2/libbar-1.0.0.tar.gz &libbar-1.0.0/***
      +mv libbar-1.0.0 libbar

      +cat <<"EOI" >=libbar/repositories.manifest
        : 1
        :
        location: $rep/t14b
        role: prerequisite
        :
        location: $rep/t14f
        role: prerequisite
        :
        location: $rep/t14i
        role: prerequisite
        EOI

      : immediate
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0)
          EOO

        $rep_remove $~/libbar/;
        $rep_add $rep/t2 $rep/t4b $rep/t14c && $rep_fetch;

        $* --deorphan --immediate libbar 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            replace/update libbar/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available 1.1.0 (1.0.0)
            libfoo configured !1.0.0 available 1.1.0+1 [1.1.0] (1.0.0) 0.1.0
          EOO

        $pkg_drop libbar
      }

      : immediate-masked
      :
      : As above but using --mask-repository instead of rep-remove.
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0)
          EOO

        $rep_add $rep/t2 $rep/t4b $rep/t14c && $rep_fetch;

        # Note that on Windows the local repository canonical name path part
        # is converted to lower case.
        #
        cn = "$canonicalize([dir_path] $~/libbar)";
        if! $posix
          cn = $lcase([string] $cn)
        end;
        cn = "dir:$cn";

        $* --mask-repository $cn --deorphan --immediate libbar 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            replace/update libbar/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available 1.1.0 (1.0.0)
            libfoo configured !1.0.0 available [1.2.0] [1.1.1] 1.1.0+1 [1.1.0] (1.0.0) 0.1.0
          EOO

        $pkg_drop libbar
      }

      : recursive
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0)
          EOO

        $rep_remove $~/libbar/;
        $rep_add $rep/t2 $rep/t4b $rep/t14c && $rep_fetch;

        $* --deorphan --recursive libbar 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            replace/update libbar/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available 1.1.0 (1.0.0)
            libfoo configured !1.0.0 available 1.1.0+1 [1.1.0] (1.0.0) 0.1.0
          EOO

        $pkg_drop libbar
      }

      : deorphan-immediate
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0)
          EOO

        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14f
          role: prerequisite
          :
          location: $rep/t14i
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan-immediate libbar 2>>~%EOE%;
            replace/upgrade libfoo/1.1.1
            reconfigure/update libbar/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.1.1
          unpacked libfoo/1.1.1
          configured libfoo/1.1.1
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.1 available [1.2.0] (1.1.1)
          EOO

        $pkg_drop libbar
      }

      : deorphan-recursive
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $rep_add $rep/t3 && $rep_fetch;
        $* libbaz 2>!;

        $pkg_status -or libbaz >>EOO;
          !libbaz configured 1.0.0 available (1.0.0)
            !libbar configured 1.0.0 available (1.0.0)
              libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0) [1.0.0] [0.1.0]
          EOO

        cat <<"EOI" >=libbar/repositories.manifest;
          : 1
          :
          location: $rep/t14f
          role: prerequisite
          :
          location: $rep/t14i
          role: prerequisite
          EOI

        $rep_fetch;

        $* --deorphan-recursive libbaz 2>>~%EOE%;
            replace/upgrade libfoo/1.1.1
            reconfigure libbar (dependent of libfoo)
            reconfigure/update libbaz/1.0.0
          disfigured libbaz/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.1.1
          unpacked libfoo/1.1.1
          configured libfoo/1.1.1
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libbaz.+ is up to date%
          %info: .+libbar.+ is up to date%
          updated libbaz/1.0.0
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbaz >>EOO;
          !libbaz configured 1.0.0 available (1.0.0)
            !libbar configured 1.0.0 available (1.0.0)
              libfoo configured !1.1.1 available [1.2.0] (1.1.1) [1.0.0] [0.1.0]
          EOO

        $pkg_drop libbaz libbar
      }
    }

    : recursive-all-held
    :
    : As above but uses 'deorphan all held packages form'.
    :
    {
      +$tar -xf $src/t2/libbar-1.0.0.tar.gz &libbar-1.0.0/***
      +mv libbar-1.0.0 libbar

      +cat <<"EOI" >=libbar/repositories.manifest
        : 1
        :
        location: $rep/t14b
        role: prerequisite
        :
        location: $rep/t14f
        role: prerequisite
        :
        location: $rep/t14i
        role: prerequisite
        EOI

      : immediate
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0)
          EOO

        $rep_remove $~/libbar/;
        $rep_add $rep/t2 $rep/t4b $rep/t14c && $rep_fetch;

        $* --deorphan --immediate 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            replace/update libbar/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available 1.1.0 (1.0.0)
            libfoo configured !1.0.0 available 1.1.0+1 [1.1.0] (1.0.0) 0.1.0
          EOO

        $pkg_drop libbar
      }

      : recursive
      :
      {
        $clone_root_cfg;
        cp -rp ../libbar ./;

        $rep_add --type dir libbar/ && $rep_fetch;
        $* libbar ?libfoo/1.1.0 2>!;

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available (1.0.0)
            libfoo configured !1.1.0 available [1.2.0] [1.1.1] (1.1.0)
          EOO

        $rep_remove $~/libbar/;
        $rep_add $rep/t2 $rep/t4b $rep/t14c && $rep_fetch;

        $* --deorphan --recursive 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            replace/update libbar/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.1.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -or libbar >>EOO;
          !libbar configured 1.0.0 available 1.1.0 (1.0.0)
            libfoo configured !1.0.0 available 1.1.0+1 [1.1.0] (1.0.0) 0.1.0
          EOO

        $pkg_drop libbar
      }
    }

    : same-version
    :
    {
      : best-match
      :
      {
        $clone_root_cfg;

        $rep_add $rep/t1 && $rep_fetch;
        $* libfoo 2>!;

        $rep_add $rep/t2 && $rep_fetch;
        $* libbar ?libfoo 2>!;

        $rep_remove $rep/t1;

        $* --deorphan ?libfoo 2>>~%EOE%;
            replace/update libfoo/1.0.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_drop libbar
      }

      : constrained
      :
      {
        $clone_root_cfg;

        $rep_add $rep/t1 && $rep_fetch;
        $* libfoo 2>!;

        $rep_add $rep/t2 && $rep_fetch;
        $* libbar ?libfoo 2>!;

        $rep_remove $rep/t1;

        $* --deorphan ?libfoo/1.0.0 2>>~%EOE%;
            replace/update libfoo/1.0.0
            reconfigure libbar (dependent of libfoo)
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_drop libbar
      }
    }
  }

  : held
  :
  {
    : basics
    :
    {
      $clone_root_cfg;

      cp -r $src/libfoo-1.1.0 libfoo;
      sed -i -e 's/(version:).+/\1 1.0.0/' libfoo/manifest;

      $rep_add --type dir libfoo/ && $rep_fetch;

      $* libfoo 2>!;

      echo "" >+ libfoo/manifest;
      $rep_fetch;

      $pkg_status -ro libfoo >>EOO;
        !libfoo configured 1.0.0 available 1.0.0#1
        EOO

      # Deorphan libfoo/1.0.0 to libfoo/1.0.0#1.
      #
      $* --deorphan libfoo 2>>~%EOE%;
          replace/upgrade libfoo/1.0.0#1
        disfigured libfoo/1.0.0
        using libfoo/1.0.0#1 (external)
        configured libfoo/1.0.0#1
        %info: .+libfoo.+ is up to date%
        updated libfoo/1.0.0#1
        EOE

      $pkg_status -ro libfoo >>EOO;
        !libfoo configured 1.0.0#1 available (1.0.0#1)
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $rep_fetch $rep/t4a $rep/t4c;

      $pkg_status -ro libfoo >>EOO;
        !libfoo configured 1.0.0#1 available 1.1.0 (1.0.0#1) 1.0.0
        EOO

      # Deorphan libfoo/1.0.0#1 to libfoo/1.0.0.
      #
      $rep_remove $~/libfoo/;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/downgrade libfoo/1.0.0
        disfigured libfoo/1.0.0#1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+libfoo-1.0.0.+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.0.0 available 1.1.0';

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status libfoo >'!libfoo configured 1.0.0 available 1.1.0';

      # Deorphan libfoo/1.0.0 to libfoo/1.1.0.
      #
      $rep_remove $rep/t4c;

      # While at it, use the 'deorphan all held packages' form.
      #
      $* --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.1.0
        disfigured libfoo/1.0.0
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        configured libfoo/1.1.0
        %info: .+libfoo-1.1.0.+ is up to date%
        updated libfoo/1.1.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.1.0';

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status libfoo >'!libfoo configured 1.1.0';

      $pkg_drop libfoo
    }

    : basics-masked
    :
    : As above but using --mask-repository instead of rep-remove.
    :
    {
      $clone_root_cfg;

      cp -r $src/libfoo-1.1.0 libfoo;
      sed -i -e 's/(version:).+/\1 1.0.0/' libfoo/manifest;

      $rep_add --type dir libfoo/ && $rep_fetch;

      $* libfoo 2>!;

      echo "" >+ libfoo/manifest;
      $rep_fetch;

      $pkg_status -ro libfoo >>EOO;
        !libfoo configured 1.0.0 available 1.0.0#1
        EOO

      # Deorphan libfoo/1.0.0 to libfoo/1.0.0#1.
      #
      $* --deorphan libfoo 2>>~%EOE%;
          replace/upgrade libfoo/1.0.0#1
        disfigured libfoo/1.0.0
        using libfoo/1.0.0#1 (external)
        configured libfoo/1.0.0#1
        %info: .+libfoo.+ is up to date%
        updated libfoo/1.0.0#1
        EOE

      $pkg_status -ro libfoo >>EOO;
        !libfoo configured 1.0.0#1 available (1.0.0#1)
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $rep_fetch $rep/t4a $rep/t4c;

      $pkg_status -ro libfoo >>EOO;
        !libfoo configured 1.0.0#1 available 1.1.0 (1.0.0#1) 1.0.0
        EOO

      # Deorphan libfoo/1.0.0#1 to libfoo/1.0.0.
      #
      # Note that on Windows the local repository canonical name path part is
      # converted to lower case.
      #
      cn = "$canonicalize([dir_path] $~/libfoo)";
      if! $posix
        cn = $lcase([string] $cn)
      end;
      cn = "dir:$cn";

      $* --mask-repository $cn --deorphan libfoo 2>>~%EOE%;
          replace/downgrade libfoo/1.0.0
        disfigured libfoo/1.0.0#1
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+libfoo-1.0.0.+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.0.0 available 1.1.0 1.0.0#1';

      # Noop.
      #
      $* --mask-repository $cn --deorphan libfoo 2>'info: nothing to build';

      $pkg_status libfoo >'!libfoo configured 1.0.0 available 1.1.0 1.0.0#1';

      # Deorphan libfoo/1.0.0 to libfoo/1.1.0.
      #
      # While at it, use the 'deorphan all held packages' form.
      #
      $* --mask-repository $cn --mask-repository $rep/t4c --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.1.0
        disfigured libfoo/1.0.0
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        configured libfoo/1.1.0
        %info: .+libfoo-1.1.0.+ is up to date%
        updated libfoo/1.1.0
        EOE

      $pkg_status libfoo >'!libfoo configured 1.1.0';

      # Noop.
      #
      $* --mask-repository $cn --mask-repository $rep/t4c --deorphan libfoo \
         2>'info: nothing to build';

      $pkg_status libfoo >'!libfoo configured 1.1.0';

      $pkg_drop libfoo
    }

    : preference
    :
    {
      $clone_root_cfg;

      $tar -xf $src/t14d/libfoo-1.1.0+2.tar.gz &libfoo-1.1.0+2/***;
      mv libfoo-1.1.0+2 libfoo;

      $rep_add --type dir libfoo/ && $rep_fetch;

      $* libfoo 2>!;

      $rep_fetch $rep/t14a $rep/t14b $rep/t14c $rep/t14d $rep/t14e $rep/t14f $rep/t14i;

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+2 to the exactly same version.
      #
      $rep_remove $~/libfoo/;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/update libfoo/1.1.0+2
        disfigured libfoo/1.1.0+2
        fetched libfoo/1.1.0+2
        unpacked libfoo/1.1.0+2
        configured libfoo/1.1.0+2
        %info: .+libfoo-1.1.0\+2.+ is up to date%
        updated libfoo/1.1.0+2
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+2 to the later revision of same version (1.1.0+3).
      #
      $rep_remove $rep/t14d;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/upgrade libfoo/1.1.0+3
        disfigured libfoo/1.1.0+2
        fetched libfoo/1.1.0+3
        unpacked libfoo/1.1.0+3
        configured libfoo/1.1.0+3
        %info: .+libfoo-1.1.0\+3.+ is up to date%
        updated libfoo/1.1.0+3
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+3 available 1.2.0 1.1.1 (1.1.0+3) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+3 available 1.2.0 1.1.1 (1.1.0+3) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+3 to the later patch of same version (1.1.1).
      #
      $rep_remove $rep/t14e;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/upgrade libfoo/1.1.1
        disfigured libfoo/1.1.0+3
        fetched libfoo/1.1.1
        unpacked libfoo/1.1.1
        configured libfoo/1.1.1
        %info: .+libfoo-1.1.1.+ is up to date%
        updated libfoo/1.1.1
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.1 available 1.2.0 (1.1.1) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.1 available 1.2.0 (1.1.1) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.1 to later minor of same version (1.2.0).
      #
      $rep_remove $rep/t14f;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/upgrade libfoo/1.2.0
        disfigured libfoo/1.1.1
        fetched libfoo/1.2.0
        unpacked libfoo/1.2.0
        configured libfoo/1.2.0
        %info: .+libfoo-1.2.0.+ is up to date%
        updated libfoo/1.2.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.2.0 available (1.2.0) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.2.0 available (1.2.0) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.2.0 to latest available version (1.1.0+1).
      #
      $rep_remove $rep/t14i;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/downgrade libfoo/1.1.0+1
        disfigured libfoo/1.2.0
        fetched libfoo/1.1.0+1
        unpacked libfoo/1.1.0+1
        configured libfoo/1.1.0+1
        %info: .+libfoo-1.1.0\+1.+ is up to date%
        updated libfoo/1.1.0+1
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+1 available (1.1.0+1) 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+1 available (1.1.0+1) 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+1 to latest available version (1.1.0).
      #
      $rep_remove $rep/t14c;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/downgrade libfoo/1.1.0
        disfigured libfoo/1.1.0+1
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        configured libfoo/1.1.0
        %info: .+libfoo-1.1.0.+ is up to date%
        updated libfoo/1.1.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0 available (1.1.0) 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0 available (1.1.0) 1.0.0
        EOO

      # Deorphan libfoo/1.1.0 to latest available version (1.0.0).
      #
      $rep_remove $rep/t14b;

      $* --deorphan libfoo 2>>~%EOE%;
          replace/downgrade libfoo/1.0.0
        disfigured libfoo/1.1.0
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+libfoo-1.0.0.+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available (1.0.0)
        EOO

      # Noop.
      #
      $* --deorphan libfoo 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available (1.0.0)
        EOO

      # Deorphan fails (none available).
      #
      $rep_remove $rep/t14a;

      $* --deorphan libfoo 2>>/EOE != 0;
        error: unknown package libfoo
          info: configuration cfg/ has no repositories
          info: use 'bpkg rep-add' to add a repository
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0
        EOO

      $pkg_drop libfoo
    }

    : preference-all-held
    :
    : As above but uses 'deorphan all held packages form'.
    :
    {
      $clone_root_cfg;

      $tar -xf $src/t14d/libfoo-1.1.0+2.tar.gz &libfoo-1.1.0+2/***;
      mv libfoo-1.1.0+2 libfoo;

      $rep_add --type dir libfoo/ && $rep_fetch;

      $* libfoo 2>!;

      $rep_fetch $rep/t14a $rep/t14b $rep/t14c $rep/t14d $rep/t14e $rep/t14f $rep/t14i;

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+2 to the exactly same version.
      #
      $rep_remove $~/libfoo/;

      $* --deorphan 2>>~%EOE%;
          replace/update libfoo/1.1.0+2
        disfigured libfoo/1.1.0+2
        fetched libfoo/1.1.0+2
        unpacked libfoo/1.1.0+2
        configured libfoo/1.1.0+2
        %info: .+libfoo-1.1.0\+2.+ is up to date%
        updated libfoo/1.1.0+2
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+2 to the later revision of same version (1.1.0+3).
      #
      $rep_remove $rep/t14d;

      $* --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.1.0+3
        disfigured libfoo/1.1.0+2
        fetched libfoo/1.1.0+3
        unpacked libfoo/1.1.0+3
        configured libfoo/1.1.0+3
        %info: .+libfoo-1.1.0\+3.+ is up to date%
        updated libfoo/1.1.0+3
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+3 available 1.2.0 1.1.1 (1.1.0+3) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+3 available 1.2.0 1.1.1 (1.1.0+3) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+3 to the later patch of same version (1.1.1).
      #
      $rep_remove $rep/t14e;

      $* --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.1.1
        disfigured libfoo/1.1.0+3
        fetched libfoo/1.1.1
        unpacked libfoo/1.1.1
        configured libfoo/1.1.1
        %info: .+libfoo-1.1.1.+ is up to date%
        updated libfoo/1.1.1
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.1 available 1.2.0 (1.1.1) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.1 available 1.2.0 (1.1.1) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.1 to later minor of same version (1.2.0).
      #
      $rep_remove $rep/t14f;

      $* --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.2.0
        disfigured libfoo/1.1.1
        fetched libfoo/1.2.0
        unpacked libfoo/1.2.0
        configured libfoo/1.2.0
        %info: .+libfoo-1.2.0.+ is up to date%
        updated libfoo/1.2.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.2.0 available (1.2.0) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.2.0 available (1.2.0) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.2.0 to latest available version (1.1.0+1).
      #
      $rep_remove $rep/t14i;

      $* --deorphan 2>>~%EOE%;
          replace/downgrade libfoo/1.1.0+1
        disfigured libfoo/1.2.0
        fetched libfoo/1.1.0+1
        unpacked libfoo/1.1.0+1
        configured libfoo/1.1.0+1
        %info: .+libfoo-1.1.0\+1.+ is up to date%
        updated libfoo/1.1.0+1
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+1 available (1.1.0+1) 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+1 available (1.1.0+1) 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+1 to latest available version (1.1.0).
      #
      $rep_remove $rep/t14c;

      $* --deorphan 2>>~%EOE%;
          replace/downgrade libfoo/1.1.0
        disfigured libfoo/1.1.0+1
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        configured libfoo/1.1.0
        %info: .+libfoo-1.1.0.+ is up to date%
        updated libfoo/1.1.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0 available (1.1.0) 1.0.0
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0 available (1.1.0) 1.0.0
        EOO

      # Deorphan libfoo/1.1.0 to latest available version (1.0.0).
      #
      $rep_remove $rep/t14b;

      $* --deorphan 2>>~%EOE%;
          replace/downgrade libfoo/1.0.0
        disfigured libfoo/1.1.0
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+libfoo-1.0.0.+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available (1.0.0)
        EOO

      # Noop.
      #
      $* --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available (1.0.0)
        EOO

      # Deorphan fails (none available).
      #
      $rep_remove $rep/t14a;

      $* --deorphan 2>>/EOE != 0;
        error: libfoo is not available
          info: configuration cfg/ has no repositories
          info: use 'bpkg rep-add' to add a repository
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0
        EOO

      $pkg_drop libfoo
    }

    : preference-all-held-masked
    :
    : As above but using --mask-repository instead of rep-remove.
    :
    {
      $clone_root_cfg;

      $tar -xf $src/t14d/libfoo-1.1.0+2.tar.gz &libfoo-1.1.0+2/***;
      mv libfoo-1.1.0+2 libfoo;

      $rep_add --type dir libfoo/ && $rep_fetch;

      $* libfoo 2>!;

      $rep_fetch $rep/t14a $rep/t14b $rep/t14c $rep/t14d $rep/t14e $rep/t14f $rep/t14i;

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+2 to the exactly same version.
      #
      # Note that on Windows the local repository canonical name path part is
      # converted to lower case.
      #
      cn = "$canonicalize([dir_path] $~/libfoo)";
      if! $posix
        cn = $lcase([string] $cn)
      end;
      cn = "dir:$cn";

      mask = --mask-repository $cn;

      $* $mask --deorphan 2>>~%EOE%;
          replace/update libfoo/1.1.0+2
        disfigured libfoo/1.1.0+2
        fetched libfoo/1.1.0+2
        unpacked libfoo/1.1.0+2
        configured libfoo/1.1.0+2
        %info: .+libfoo-1.1.0\+2.+ is up to date%
        updated libfoo/1.1.0+2
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+2 available 1.2.0 1.1.1 1.1.0+3 (1.1.0+2) 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+2 to the later revision of same version (1.1.0+3).
      #
      mask += --mask-repository $rep/t14d;

      $* $mask --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.1.0+3
        disfigured libfoo/1.1.0+2
        fetched libfoo/1.1.0+3
        unpacked libfoo/1.1.0+3
        configured libfoo/1.1.0+3
        %info: .+libfoo-1.1.0\+3.+ is up to date%
        updated libfoo/1.1.0+3
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+3 available 1.2.0 1.1.1 (1.1.0+3) 1.1.0+2 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+3 available 1.2.0 1.1.1 (1.1.0+3) 1.1.0+2 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+3 to the later patch of same version (1.1.1).
      #
      mask += --mask-repository $rep/t14e;

      $* $mask --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.1.1
        disfigured libfoo/1.1.0+3
        fetched libfoo/1.1.1
        unpacked libfoo/1.1.1
        configured libfoo/1.1.1
        %info: .+libfoo-1.1.1.+ is up to date%
        updated libfoo/1.1.1
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.1 available 1.2.0 (1.1.1) 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.1 available 1.2.0 (1.1.1) 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.1 to later minor of same version (1.2.0).
      #
      mask += --mask-repository $rep/t14f;

      $* $mask --deorphan 2>>~%EOE%;
          replace/upgrade libfoo/1.2.0
        disfigured libfoo/1.1.1
        fetched libfoo/1.2.0
        unpacked libfoo/1.2.0
        configured libfoo/1.2.0
        %info: .+libfoo-1.2.0.+ is up to date%
        updated libfoo/1.2.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.2.0 available (1.2.0) 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.2.0 available (1.2.0) 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.2.0 to latest available version (1.1.0+1).
      #
      mask += --mask-repository $rep/t14i;

      $* $mask --deorphan 2>>~%EOE%;
          replace/downgrade libfoo/1.1.0+1
        disfigured libfoo/1.2.0
        fetched libfoo/1.1.0+1
        unpacked libfoo/1.1.0+1
        configured libfoo/1.1.0+1
        %info: .+libfoo-1.1.0\+1.+ is up to date%
        updated libfoo/1.1.0+1
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+1 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 (1.1.0+1) 1.1.0 1.0.0
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0+1 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 (1.1.0+1) 1.1.0 1.0.0
        EOO

      # Deorphan libfoo/1.1.0+1 to latest available version (1.1.0).
      #
      mask += --mask-repository $rep/t14c;

      $* $mask --deorphan 2>>~%EOE%;
          replace/downgrade libfoo/1.1.0
        disfigured libfoo/1.1.0+1
        fetched libfoo/1.1.0
        unpacked libfoo/1.1.0
        configured libfoo/1.1.0
        %info: .+libfoo-1.1.0.+ is up to date%
        updated libfoo/1.1.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 (1.1.0) 1.0.0
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.1.0 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 (1.1.0) 1.0.0
        EOO

      # Deorphan libfoo/1.1.0 to latest available version (1.0.0).
      #
      mask += --mask-repository $rep/t14b;

      $* $mask --deorphan 2>>~%EOE%;
          replace/downgrade libfoo/1.0.0
        disfigured libfoo/1.1.0
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        configured libfoo/1.0.0
        %info: .+libfoo-1.0.0.+ is up to date%
        updated libfoo/1.0.0
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 (1.0.0)
        EOO

      # Noop.
      #
      $* $mask --deorphan 2>'info: nothing to build';

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 (1.0.0)
        EOO

      # Deorphan fails (none available).
      #
      mask += --mask-repository $rep/t14a;

      $* $mask --deorphan 2>>/EOE != 0;
        error: libfoo is not available
        EOE

      $pkg_status -o libfoo >>EOO;
        !libfoo configured 1.0.0 available 1.2.0 1.1.1 1.1.0+3 1.1.0+2 1.1.0+1 1.1.0 (1.0.0)
        EOO

      $pkg_drop libfoo
    }
  }
}

: compatibility
:
{
  +$clone_cfg
  +$rep_add $rep/t15 && $rep_fetch

  test.arguments += --yes

  : toolchain
  :
  {
    +$clone_cfg

    : build-satisfied
    :
    {
      $clone_cfg;

      $* libfoo libbar 2>>~%EOE%;
        fetched libfoo/1.0.0
        unpacked libfoo/1.0.0
        fetched libbar/1.0.0
        unpacked libbar/1.0.0
        configured libfoo/1.0.0
        configured libbar/1.0.0
        %info: .+libfoo-1.0.0.+ is up to date%
        %info: .+libbar-1.0.0.+ is up to date%
        updated libfoo/1.0.0
        updated libbar/1.0.0
        EOE

      $pkg_drop libfoo libbar
    }

    : build-fail-unsatisfied
    :
    {
      $clone_cfg;

      $* libbaz 2>>~%EOE% != 0
        error: unable to satisfy constraint (build2 >= 65536.0.0) for package libbaz
        %  info: available build2 version is .+%
        info: while satisfying libbaz/1.0.0
        EOE
    }

    : build-fail-unsatisfied-dependency
    :
    {
      $clone_cfg;

      $* libbiz 2>>~%EOE% != 0
        error: unable to satisfy constraint (build2 >= 65536.0.0) for package libbaz
        %  info: available build2 version is .+%
        info: while satisfying libbaz/1.0.0
        info: while satisfying libbiz/1.0.0
        EOE
    }
  }
}

: existing-package
:
{
  +$tar -xf $src/libbar-1.2.0.tar.gz &libbar-1.2.0/***
  +$tar -xf $src/libbar-1.1.0.tar.gz &libbar-1.1.0/***
  +$tar -xf $src/libbar-1.0.0.tar.gz &libbar-1.0.0/***
  +$tar -xf $src/libbar-0.0.3.tar.gz &libbar-0.0.3/***
  +$tar -xf $src/libbaz-1.1.0.tar.gz &libbaz-1.1.0/***
  +$tar -xf $src/libfoo-1.1.0.tar.gz &libfoo-1.1.0/***
  +$tar -xf $src/libfoo-1.0.0.tar.gz &libfoo-1.0.0/***

  d = [dir_path] ../../../

  test.arguments += --yes

  : hold
  :
  {
    : archive
    :
    {
      : pick-archive
      :
      : Test that libbar/1.0.0 specified as an archive is picked as a
      : dependency for libbaz, despite the fact the repository contains
      : libbar/1.2.0.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz \
           $src/libfoo-1.0.0.tar.gz \
           $src/libbar-1.0.0.tar.gz 2>>~%EOE%;
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libfoo-1.0.0.+ is up to date%
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libfoo/1.0.0
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            !libbar configured !1.0.0 available 1.2.0
              !libfoo configured !1.0.0
            !libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz libfoo libbar
      }

      : pick-repo
      :
      : Picks the libbar/1.2.0 dependency from the repository for the
      : dependent libbaz/1.1.0 specified as an archive.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz $src/libfoo-1.0.0.tar.gz 2>>~%EOE%;
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          configured libbar/1.2.0
          configured libfoo/1.0.0
          configured libbaz/1.1.0
          %info: .+libfoo-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libfoo/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.2.0
            !libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz libfoo libbar
      }

      : unsatisfactory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4b && $rep_fetch;

        $* libbar $src/libfoo-1.0.0.tar.gz 2>>~%EOE% != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : unsatisfactory-archive
      :
      : Same as above but the dependent is specified as an archive.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a && $rep_fetch; # Note: libfoo/1.1.0 belongs to t4a.

        $* $src/libbar-1.1.0.tar.gz $src/libfoo-1.0.0.tar.gz 2>>~%EOE% != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
                    command line requires (libbar == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : dependency-alternative
      :
      : Note: by specifying an unsatisfactory dependency alternative as an
      : archive we resolve the alternatives ambiguity here, building both
      : libbar and libbaz packages as a result.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t8a && $rep_fetch;

        $* fox 2>>EOE != 0;
          error: unable to select dependency alternative for package fox/1.0.0
            info: explicitly specify dependency packages to manually select the alternative
            info: alternative: libbar
            info: alternative: libbaz
          info: while satisfying fox/1.0.0
          EOE

        $* fox $src/libbar-0.0.3.tar.gz 2>>~%EOE%;
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          fetched fox/1.0.0
          unpacked fox/1.0.0
          fetched libbar/0.0.3
          unpacked libbar/0.0.3
          configured libbaz/1.1.0
          configured fox/1.0.0
          configured libbar/0.0.3
          %info: .+fox-1.0.0.+ is up to date%
          %info: .+libbar-0.0.3.+ is up to date%
          updated fox/1.0.0
          updated libbar/0.0.3
          EOE

        $pkg_status -r fox libbar >>EOO;
          !fox configured 1.0.0
            libbaz configured 1.1.0
          !libbar configured !0.0.3 available 1.0.0
            libbaz configured 1.1.0
          EOO

        $pkg_drop fox libbar
      }

      : upgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a $rep/t4b && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz \
           $src/libfoo-1.0.0.tar.gz \
           $src/libbar-1.0.0.tar.gz 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            !libbar configured !1.0.0 available 1.1.0
              !libfoo configured !1.0.0 available 1.1.0
            !libfoo configured !1.0.0 available 1.1.0
          EOO

        $* --upgrade-recursive libbaz 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.1.0
            !libbar configured !1.1.0
              !libfoo configured !1.1.0
            !libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz libbar libfoo
      }

      : downgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* libbar 2>!;

        $* $src/libbar-1.0.0.tar.gz "?$src/libfoo-1.0.0.tar.gz" 2>>~%EOE%;
          disfigured libbar/1.2.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured !1.0.0 available 1.2.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbar
      }

      : replace
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* libfoo 2>!;

        $* $src/libfoo-1.0.0.tar.gz 2>>~%EOE%;
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          %info: .+libfoo-1.0.0.+ is up to date%
          updated libfoo/1.0.0
          EOE

        $pkg_status -r libfoo >>EOO;
          !libfoo configured !1.0.0
          EOO

        $* --plan "" $src/libfoo-1.0.0.tar.gz 2>>~%EOE%;
            replace/update libfoo/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          %info: .+libfoo-1.0.0.+ is up to date%
          updated libfoo/1.0.0
          EOE

        $pkg_status -r libfoo >>EOO;
          !libfoo configured !1.0.0
          EOO

        $* --plan "" $d/libfoo-1.0.0/ 2>>~%EOE%;
            replace/upgrade libfoo/1.0.0#1
          disfigured libfoo/1.0.0
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          %info: .+libfoo.+ is up to date%
          updated libfoo/1.0.0#1
          EOE

        $pkg_status -r libfoo >>EOO;
          !libfoo configured !1.0.0#1
          EOO

        $pkg_drop libfoo
      }

      : deorphan-existing-archive
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz \
           $src/libfoo-1.0.0.tar.gz \
           $src/libbar-1.0.0.tar.gz 2>!;

        $* --deorphan libfoo 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libfoo-1.0.0.+ is up to date%
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libfoo/1.0.0
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            !libbar configured !1.0.0
              !libfoo configured 1.0.0
            !libfoo configured 1.0.0
          EOO

        $rep_add $rep/t3 && $rep_fetch;

        $* --deorphan 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz libfoo >>EOO;
          !libbaz configured 1.0.0
            !libbar configured 1.0.0
              !libfoo configured 1.0.0
          !libfoo configured 1.0.0
          EOO

        $pkg_drop libbaz libbar libfoo
      }

      : deorphan-with-existing-archive
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 $rep/t3 && $rep_fetch;

        $* libbaz libbar 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            !libbar configured 1.0.0
              libfoo configured 1.0.0
          EOO

        $rep_remove $rep/t2 $rep/t3;

        $* --deorphan $src/libfoo-1.0.0.tar.gz 2>>~%EOE%;
          disfigured libbaz/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libfoo-1.0.0.+ is up to date%
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libfoo/1.0.0
          updated libbar/1.0.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            !libbar configured 1.0.0
              !libfoo configured !1.0.0
          EOO

        $* --deorphan $src/libbar-1.2.0.tar.gz 2>>~%EOE%;
          disfigured libbaz/1.0.0
          disfigured libbar/1.0.0
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          configured libbar/1.2.0
          configured libbaz/1.0.0
          %info: .+libbar-1.2.0.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbar/1.2.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz libfoo >>EOO;
          !libbaz configured 1.0.0
            !libbar configured !1.2.0
          !libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz libbar libfoo
      }

      : system
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t3 && $rep_fetch;

        $* libbaz '?sys:libbar' 2>!;

        $* $src/libbar-1.1.0.tar.gz "?$src/libfoo-1.1.0.tar.gz" 2>>~%EOE%;
          disfigured libbaz/1.0.0
          purged libbar/*
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.0.0
          %info: .+libbar-1.1.0.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbar/1.1.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            !libbar configured !1.1.0
              libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz libbar
      }
    }

    : directory
    :
    {
      : pick-directory
      :
      : Test that libbar/1.0.0 specified as a directory is picked as a
      : dependency for libbaz, despite the fact the repository contains
      : libbar/1.2.0.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $d/libbaz-1.1.0/ \
           $d/libfoo-1.0.0/ \
           $d/libbar-1.0.0/ 2>>~%EOE%;
          using libfoo/1.0.0 (external)
          using libbar/1.0.0 (external)
          using libbaz/1.1.0 (external)
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libfoo.+ is up to date%
          %info: .+libbar.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libfoo/1.0.0
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            !libbar configured !1.0.0 available 1.2.0
              !libfoo configured !1.0.0
            !libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz libfoo libbar
      }

      : pick-repo
      :
      : Picks the libbar/1.2.0 dependency from the repository for the
      : dependent libbaz/1.1.0 specified as a directory.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $d/libbaz-1.1.0/ $d/libfoo-1.0.0/ 2>>~%EOE%;
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          using libfoo/1.0.0 (external)
          using libbaz/1.1.0 (external)
          configured libbar/1.2.0
          configured libfoo/1.0.0
          configured libbaz/1.1.0
          %info: .+libfoo.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libfoo/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.2.0
            !libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz libfoo libbar
      }

      : unsatisfactory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4b && $rep_fetch;

        $* libbar $d/libfoo-1.0.0/ 2>>~%EOE% != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : unsatisfactory-archive
      :
      : Same as above but the dependent is specified as a directory.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a && $rep_fetch; # Note: libfoo/1.1.0 belongs to t4a.

        $* $d/libbar-1.1.0/ $d/libfoo-1.0.0/ 2>>~%EOE% != 0
          error: unable to satisfy constraints on package libfoo
            info: command line depends on (libfoo == 1.0.0)
            info: libbar/1.1.0 depends on (libfoo == 1.1.0)
                    command line requires (libbar == 1.1.0)
            info: available libfoo/1.0.0
            info: available libfoo/1.1.0
            info: while satisfying libbar/1.1.0
            info: explicitly specify libfoo version to manually satisfy both constraints
          EOE
      }

      : dependency-alternative
      :
      : Note: by specifying an unsatisfactory dependency alternative as a
      : directory we resolve the alternatives ambiguity here, building both
      : libbar and libbaz packages as a result.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t8a && $rep_fetch;

        $* fox 2>>EOE != 0;
          error: unable to select dependency alternative for package fox/1.0.0
            info: explicitly specify dependency packages to manually select the alternative
            info: alternative: libbar
            info: alternative: libbaz
          info: while satisfying fox/1.0.0
          EOE

        $* fox $d/libbar-0.0.3/ 2>>~%EOE%;
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          fetched fox/1.0.0
          unpacked fox/1.0.0
          using libbar/0.0.3 (external)
          configured libbaz/1.1.0
          configured fox/1.0.0
          configured libbar/0.0.3
          %info: .+fox-1.0.0.+ is up to date%
          %info: .+libbar.+ is up to date%
          updated fox/1.0.0
          updated libbar/0.0.3
          EOE

        $pkg_status -r fox libbar >>EOO;
          !fox configured 1.0.0
            libbaz configured 1.1.0
          !libbar configured !0.0.3 available 1.0.0
            libbaz configured 1.1.0
          EOO

        $pkg_drop fox libbar
      }

      : upgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a $rep/t4b && $rep_fetch;

        $* $d/libbaz-1.1.0/ \
           $d/libfoo-1.0.0/ \
           $d/libbar-1.0.0/ 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            !libbar configured !1.0.0 available 1.1.0
              !libfoo configured !1.0.0 available 1.1.0
            !libfoo configured !1.0.0 available 1.1.0
          EOO

        $* --upgrade-recursive libbaz 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.1.0
            !libbar configured !1.1.0
              !libfoo configured !1.1.0
            !libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz libbar libfoo
      }

      : downgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* libbar 2>!;

        $* $d/libbar-1.0.0/ "?$d/libfoo-1.0.0/" 2>>~%EOE%;
          disfigured libbar/1.2.0
          using libfoo/1.0.0 (external)
          using libbar/1.0.0 (external)
          configured libfoo/1.0.0
          configured libbar/1.0.0
          %info: .+libbar.+ is up to date%
          updated libbar/1.0.0
          EOE

        $pkg_status -r libbar >>EOO;
          !libbar configured !1.0.0 available 1.2.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbar
      }

      : replace
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* libfoo 2>!;

        $* $d/libfoo-1.0.0/ 2>>~%EOE%;
          disfigured libfoo/1.0.0
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          %info: .+libfoo.+ is up to date%
          updated libfoo/1.0.0#1
          EOE

        $pkg_status -r libfoo >>EOO;
          !libfoo configured !1.0.0#1
          EOO

        $* --plan "" $d/libfoo-1.0.0/ 2>>~%EOE%;
            replace/update libfoo/1.0.0#1
          disfigured libfoo/1.0.0#1
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          %info: .+libfoo.+ is up to date%
          updated libfoo/1.0.0#1
          EOE

        $pkg_status -r libfoo >>EOO;
          !libfoo configured !1.0.0#1
          EOO

        $* --plan "" $src/libfoo-1.0.0.tar.gz 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
          disfigured libfoo/1.0.0#1
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          %info: .+libfoo-1.0.0.+ is up to date%
          updated libfoo/1.0.0
          EOE

        $pkg_status -r libfoo >>EOO;
          !libfoo configured !1.0.0
          EOO

        $pkg_drop libfoo
      }

      : deorphan-existing-directory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* $d/libbaz-1.1.0/ \
           $d/libfoo-1.0.0/ \
           $d/libbar-1.0.0/ 2>!;

        $* --deorphan libfoo 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libfoo-1.0.0.+ is up to date%
          %info: .+libbar.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libfoo/1.0.0
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            !libbar configured !1.0.0
              !libfoo configured 1.0.0
            !libfoo configured 1.0.0
          EOO

        $rep_add $rep/t3 && $rep_fetch;

        $* --deorphan 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz libfoo >>EOO;
          !libbaz configured 1.0.0
            !libbar configured 1.0.0
              !libfoo configured 1.0.0
          !libfoo configured 1.0.0
          EOO

        $pkg_drop libbaz libbar libfoo
      }

      : deorphan-with-existing-directory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 $rep/t3 && $rep_fetch;

        $* libbaz libbar 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            !libbar configured 1.0.0
              libfoo configured 1.0.0
          EOO

        $rep_remove $rep/t2 $rep/t3;

        $* --deorphan $d/libfoo-1.0.0/ 2>>~%EOE%;
          disfigured libbaz/1.0.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libfoo.+ is up to date%
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libfoo/1.0.0#1
          updated libbar/1.0.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            !libbar configured 1.0.0
              !libfoo configured !1.0.0#1
          EOO

        $* --deorphan $d/libbar-1.2.0/ 2>>~%EOE%;
          disfigured libbaz/1.0.0
          disfigured libbar/1.0.0
          using libbar/1.2.0 (external)
          configured libbar/1.2.0
          configured libbaz/1.0.0
          %info: .+libbar.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbar/1.2.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz libfoo >>EOO;
          !libbaz configured 1.0.0
            !libbar configured !1.2.0
          !libfoo configured !1.0.0#1
          EOO

        $pkg_drop libbaz libbar libfoo
      }

      : system
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t3 && $rep_fetch;

        $* libbaz '?sys:libbar' 2>!;

        $* $d/libbar-1.1.0/ "?$d/libfoo-1.1.0/" 2>>~%EOE%;
          disfigured libbaz/1.0.0
          purged libbar/*
          using libfoo/1.1.0 (external)
          using libbar/1.1.0 (external)
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.0.0
          %info: .+libbar.+ is up to date%
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbar/1.1.0
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            !libbar configured !1.1.0
              libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz libbar
      }
    }
  }

  : dependency
  :
  {
    : archive
    :
    {
      : pick-archive
      :
      : Test that libbar/1.0.0 specified as an archive is picked as a
      : dependency for libbaz, despite the fact the repository contains
      : libbar/1.2.0.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz    \
           "?$src/libfoo-1.0.0.tar.gz" \
           "?$src/libbar-1.0.0.tar.gz" 2>>~%EOE%;
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0 available 1.2.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : unsatisfactory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4b && $rep_fetch;

        $* libbar "?$src/libfoo-1.0.0.tar.gz" 2>>EOE != 0
          error: package libfoo doesn't satisfy its dependents
            info: libfoo/1.0.0 doesn't satisfy libbar/1.1.0
          EOE
      }

      : unsatisfactory-archive
      :
      : Same as above but the dependent is specified as an archive.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a && $rep_fetch;

        $* $src/libbar-1.1.0.tar.gz "?$src/libfoo-1.0.0.tar.gz" 2>>EOE != 0
          error: package libfoo doesn't satisfy its dependents
            info: libfoo/1.0.0 doesn't satisfy libbar/1.1.0
          EOE
      }

      : dependency-alternative
      :
      : Note: by specifying an unsatisfactory dependency alternative as an
      : archive we resolve the alternatives ambiguity here, building libbaz and
      : skipping unused libbar as a result.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t8a && $rep_fetch;

        $* fox 2>>EOE != 0;
          error: unable to select dependency alternative for package fox/1.0.0
            info: explicitly specify dependency packages to manually select the alternative
            info: alternative: libbar
            info: alternative: libbaz
          info: while satisfying fox/1.0.0
          EOE

        $* fox "?$src/libbar-0.0.3.tar.gz" 2>>~%EOE%;
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          fetched fox/1.0.0
          unpacked fox/1.0.0
          configured libbaz/1.1.0
          configured fox/1.0.0
          %info: .+fox-1.0.0.+ is up to date%
          updated fox/1.0.0
          EOE

        $pkg_status -r fox libbar >>EOO;
          !fox configured 1.0.0
            libbaz configured 1.1.0
          libbar available 1.0.0
          EOO

        $pkg_drop fox
      }

      : upgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a $rep/t4b && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz \
           "?$src/libfoo-1.0.0.tar.gz" \
           "?$src/libbar-1.0.0.tar.gz" 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0 available 1.1.0
              libfoo configured !1.0.0 available 1.1.0
            libfoo configured !1.0.0 available 1.1.0
          EOO

        $* --upgrade-recursive libbaz 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.1.0
            libbar configured !1.1.0
              libfoo configured !1.1.0
            libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz
      }

      : downgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz "?$src/libfoo-1.0.0.tar.gz" 2>>~%EOE%;
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          configured libbar/1.2.0
          configured libfoo/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.2.0
            libfoo configured !1.0.0
          EOO

        $* --plan "" "?$src/libbar-1.0.0.tar.gz" 2>>~%EOE%;
            replace/downgrade libbar/1.0.0
            reconfigure libbaz (dependent of libbar)
          disfigured libbaz/1.1.0
          disfigured libbar/1.2.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0 available 1.2.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : replace
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz 2>!;

        $* --plan "" "?$src/libfoo-1.0.0.tar.gz" 2>>~%EOE%;
            replace/update libfoo/1.0.0
            reconfigure libbar (dependent of libfoo)
            reconfigure libbaz (dependent of libbar, libfoo)
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.0.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $* --plan "" "?$src/libfoo-1.0.0.tar.gz" 2>>~%EOE%;
            replace/update libfoo/1.0.0
            reconfigure libbar (dependent of libfoo)
            reconfigure libbaz (dependent of libbar, libfoo)
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.0.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $* --plan "" "?$d/libfoo-1.0.0/" 2>>~%EOE%;
            replace/upgrade libfoo/1.0.0#1
            reconfigure libbar (dependent of libfoo)
            reconfigure libbaz (dependent of libbar, libfoo)
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.0.0
              libfoo configured !1.0.0#1
            libfoo configured !1.0.0#1
          EOO

        $pkg_drop libbaz
      }

      : deorphan-existing-archive
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz    \
           "?$src/libfoo-1.0.0.tar.gz" \
           "?$src/libbar-1.0.0.tar.gz" 2>!;

        $* --deorphan ?libfoo 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $rep_add $rep/t3 && $rep_fetch;

        $* --deorphan libbaz ?libbar 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbaz/1.0.0
          EOE

        $pkg_drop libbaz
      }

      : deorphan-with-existing-archive
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $src/libbaz-1.1.0.tar.gz "?$src/libfoo-1.0.0.tar.gz" 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.2.0
            libfoo configured !1.0.0
          EOO

        $rep_remove $rep/t5;

        $* --deorphan "?$src/libbar-1.2.0.tar.gz" 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.2.0
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          configured libbar/1.2.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.2.0
            libfoo configured !1.0.0
          EOO

        $* --deorphan "?$src/libbar-1.0.0.tar.gz" 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.2.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz-1.1.0.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : system
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t3 && $rep_fetch;

        $* libbaz '?sys:libbar' 2>!;

        $* "?$src/libbar-1.1.0.tar.gz" "?$src/libfoo-1.1.0.tar.gz" 2>>~%EOE%;
          disfigured libbaz/1.0.0
          purged libbar/*
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.0.0
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            libbar configured !1.1.0
              libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz
      }
    }

    : directory
    :
    {
      : pick-directory
      :
      : Test that libbar/1.0.0 specified as a directory is picked as a
      : dependency for libbaz, despite the fact the repository contains
      : libbar/1.2.0.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $d/libbaz-1.1.0/ \
           "?$d/libfoo-1.0.0/"      \
           "?$d/libbar-1.0.0/" 2>>~%EOE%;
          using libfoo/1.0.0 (external)
          using libbar/1.0.0 (external)
          using libbaz/1.1.0 (external)
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0 available 1.2.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : unsatisfactory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4b && $rep_fetch;

        $* libbar "?$d/libfoo-1.0.0/" 2>>EOE != 0
          error: package libfoo doesn't satisfy its dependents
            info: libfoo/1.0.0 doesn't satisfy libbar/1.1.0
          EOE
      }

      : unsatisfactory-archive
      :
      : Same as above but the dependent is specified as a directory.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a && $rep_fetch;

        $* $d/libbar-1.1.0/ "?$d/libfoo-1.0.0/" 2>>EOE != 0
          error: package libfoo doesn't satisfy its dependents
            info: libfoo/1.0.0 doesn't satisfy libbar/1.1.0
          EOE
      }

      : dependency-alternative
      :
      : Note: by specifying an unsatisfactory dependency alternative as a
      : directory we resolve the alternatives ambiguity here, building libbaz
      : and skipping unused libbar as a result.
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t8a && $rep_fetch;

        $* fox 2>>EOE != 0;
          error: unable to select dependency alternative for package fox/1.0.0
            info: explicitly specify dependency packages to manually select the alternative
            info: alternative: libbar
            info: alternative: libbaz
          info: while satisfying fox/1.0.0
          EOE

        $* fox "?$d/libbar-0.0.3/" 2>>~%EOE%;
          fetched libbaz/1.1.0
          unpacked libbaz/1.1.0
          fetched fox/1.0.0
          unpacked fox/1.0.0
          configured libbaz/1.1.0
          configured fox/1.0.0
          %info: .+fox-1.0.0.+ is up to date%
          updated fox/1.0.0
          EOE

        $pkg_status -r fox libbar >>EOO;
          !fox configured 1.0.0
            libbaz configured 1.1.0
          libbar available 1.0.0
          EOO

        $pkg_drop fox
      }

      : upgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t4a $rep/t4b && $rep_fetch;

        $* $d/libbaz-1.1.0/ \
           "?$d/libfoo-1.0.0/" \
           "?$d/libbar-1.0.0/" 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0 available 1.1.0
              libfoo configured !1.0.0 available 1.1.0
            libfoo configured !1.0.0 available 1.1.0
          EOO

        $* --upgrade-recursive libbaz 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.1.0
          unpacked libfoo/1.1.0
          fetched libbar/1.1.0
          unpacked libbar/1.1.0
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.1.0
            libbar configured !1.1.0
              libfoo configured !1.1.0
            libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz
      }

      : downgrade
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $d/libbaz-1.1.0/ "?$d/libfoo-1.0.0/" 2>>~%EOE%;
          fetched libbar/1.2.0
          unpacked libbar/1.2.0
          using libfoo/1.0.0 (external)
          using libbaz/1.1.0 (external)
          configured libbar/1.2.0
          configured libfoo/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.2.0
            libfoo configured !1.0.0
          EOO

        $* --plan "" "?$d/libbar-1.0.0/" 2>>~%EOE%;
            replace/downgrade libbar/1.0.0
            reconfigure libbaz (dependent of libbar)
          disfigured libbaz/1.1.0
          disfigured libbar/1.2.0
          using libbar/1.0.0 (external)
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0 available 1.2.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : replace
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* $d/libbaz-1.1.0/ 2>!;

        $* --plan "" "?$d/libfoo-1.0.0/" 2>>~%EOE%;
            replace/upgrade libfoo/1.0.0#1
            reconfigure libbar (dependent of libfoo)
            reconfigure libbaz (dependent of libbar, libfoo)
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.0.0
              libfoo configured !1.0.0#1
            libfoo configured !1.0.0#1
          EOO

        $* --plan "" "?$d/libfoo-1.0.0/" 2>>~%EOE%;
            replace/update libfoo/1.0.0#1
            reconfigure libbar (dependent of libfoo)
            reconfigure libbaz (dependent of libbar, libfoo)
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0#1
          using libfoo/1.0.0#1 (external)
          configured libfoo/1.0.0#1
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.0.0
              libfoo configured !1.0.0#1
            libfoo configured !1.0.0#1
          EOO

        $* --plan "" "?$src/libfoo-1.0.0.tar.gz" 2>>~%EOE%;
            replace/downgrade libfoo/1.0.0
            reconfigure libbar (dependent of libfoo)
            reconfigure libbaz (dependent of libbar, libfoo)
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0#1
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar-1.0.0.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.0.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : deorphan-existing-directory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t2 && $rep_fetch;

        $* $d/libbaz-1.1.0/    \
           "?$d/libfoo-1.0.0/" \
           "?$d/libbar-1.0.0/" 2>!;

        $* --deorphan ?libfoo 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          disfigured libfoo/1.0.0
          fetched libfoo/1.0.0
          unpacked libfoo/1.0.0
          configured libfoo/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbar.+ is up to date%
          %info: .+libbaz.+ is up to date%
          updated libbar/1.0.0
          updated libbaz/1.1.0
          EOE

        $rep_add $rep/t3 && $rep_fetch;

        $* --deorphan libbaz ?libbar 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.0.0
          fetched libbar/1.0.0
          unpacked libbar/1.0.0
          fetched libbaz/1.0.0
          unpacked libbaz/1.0.0
          configured libbar/1.0.0
          configured libbaz/1.0.0
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbaz/1.0.0
          EOE

        $pkg_drop libbaz
      }

      : deorphan-with-existing-directory
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t5 && $rep_fetch;

        $* $d/libbaz-1.1.0/ "?$d/libfoo-1.0.0/" 2>!;

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured 1.2.0
            libfoo configured !1.0.0
          EOO

        $rep_remove $rep/t5;

        $* --deorphan "?$d/libbar-1.2.0/" 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.2.0
          using libbar/1.2.0#1 (external)
          configured libbar/1.2.0#1
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.2.0#1
            libfoo configured !1.0.0
          EOO

        # Suppress the 'dropping no longer used variable config.bin.exe.lib'
        # and alike warnings.
        #
        rm cfg/libbar/build/config.build;

        $* --deorphan "?$d/libbar-1.0.0/" 2>>~%EOE%;
          disfigured libbaz/1.1.0
          disfigured libbar/1.2.0#1
          using libbar/1.0.0 (external)
          configured libbar/1.0.0
          configured libbaz/1.1.0
          %info: .+libbaz.+ is up to date%
          updated libbaz/1.1.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured !1.1.0
            libbar configured !1.0.0
              libfoo configured !1.0.0
            libfoo configured !1.0.0
          EOO

        $pkg_drop libbaz
      }

      : system
      :
      {
        $clone_root_cfg;
        $rep_add $rep/t3 && $rep_fetch;

        $* libbaz '?sys:libbar' 2>!;

        $* "?$d/libbar-1.1.0/" "?$d/libfoo-1.1.0/" 2>>~%EOE%;
          disfigured libbaz/1.0.0
          purged libbar/*
          using libfoo/1.1.0 (external)
          using libbar/1.1.0 (external)
          configured libfoo/1.1.0
          configured libbar/1.1.0
          configured libbaz/1.0.0
          %info: .+libbaz-1.0.0.+ is up to date%
          updated libbaz/1.0.0
          EOE

        $pkg_status -r libbaz >>EOO;
          !libbaz configured 1.0.0
            libbar configured !1.1.0
              libfoo configured !1.1.0
          EOO

        $pkg_drop libbaz
      }
    }
  }
}