10 files changed, 776 insertions, 41 deletions

diff --git a/tests/test/script/builtin/sleep.testscript b/tests/test/script/builtin/sleep.testscript
index e1410ac..c044027 100644
--- a/tests/test/script/builtin/sleep.testscript
+++ b/tests/test/script/builtin/sleep.testscript
@@ -13,7 +13,7 @@ $c <'sleep 1' && $b
   : failure
   :
   $c <'env -t 1 -- sleep 86400' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: sleep terminated: execution timeout expired%
+    %testscript:.*: error: builtin sleep terminated: execution timeout expired%
     %.
     EOE
 
diff --git a/tests/test/script/common.testscript b/tests/test/script/common.testscript
index 4469d1c..651e056 100644
--- a/tests/test/script/common.testscript
+++ b/tests/test/script/common.testscript
@@ -31,7 +31,7 @@ end
 # Note that the buildfile is clever hack that relies on the first target
 # automatically becoming dir{./}'s prerequisite.
 #
-c = cat >=testscript
-b = $0 --no-default-options --serial-stop --quiet --buildfile - test \
+c = [cmdline] cat >=testscript
+b = [cmdline] $0 --no-default-options --serial-stop --quiet --buildfile - test \
 <"'testscript{testscript}: \$target'" \
 &?test/***
diff --git a/tests/test/script/runner/expr.testscript b/tests/test/script/runner/expr.testscript
index 98e495f..95d4bed 100644
--- a/tests/test/script/runner/expr.testscript
+++ b/tests/test/script/runner/expr.testscript
@@ -20,7 +20,7 @@
   true  = '$* >| -o'
   false = '$* -s 1 >| -o'
 
-  bf = $b 2>-
+  bf = [cmdline] $b 2>-
 
   : true
   :
diff --git a/tests/test/script/runner/for.testscript b/tests/test/script/runner/for.testscript
new file mode 100644
index 0000000..f43fcc2
--- /dev/null
+++ b/tests/test/script/runner/for.testscript
@@ -0,0 +1,502 @@
+# File      : tests/test/script/runner/for.testscript
+# license   : MIT; see accompanying LICENSE file
+
+.include ../common.testscript
+
+: form-1
+:
+: for x: ...
+:
+{
+  : basics
+  :
+  $c <<EOI && $b >>EOO
+    for x: a b
+      echo "$x" >|
+    end
+    EOI
+    a
+    b
+    EOO
+
+  : test-options
+  :
+  $c <<EOI && $b >>~%EOO%
+    for test.options: -a -b
+      echo $* >|
+    end
+    EOI
+    %.+ -a%
+    %.+ -b%
+    EOO
+
+  : special-var
+  :
+  $c <<EOI && $b 2>>EOE != 0
+    for ~: -a -b
+      echo $~ >|
+    end
+    EOI
+    testscript:1:5: error: attempt to set '~' variable directly
+    EOE
+
+  : exit
+  :
+  $c <<EOI && $b >>EOO
+    for x: a b
+      echo "$x" >|
+      exit
+    end
+    EOI
+    a
+    EOO
+
+  : error
+  :
+  $c <<EOI && $b >>EOO 2>>EOE != 0
+    for x: a b
+      echo "$x" >|
+      exit 'fed up'
+    end
+    EOI
+    a
+    EOO
+    testscript:3:3: error: fed up
+      info: test id: 1
+    EOE
+}
+
+: form-2
+:
+: ... | for x
+:
+{
+  : whitespace-split
+  :
+  $c <<EOI && $b >>EOO
+    echo " a b " | for -w x
+      echo "'$x'" >|
+    end
+    EOI
+    'a'
+    'b'
+    EOO
+
+  : newline-split
+  :
+  $c <<EOI && $b >>EOO
+    cat <<EOF | for -n x
+
+
+    a
+
+
+    b
+
+    EOF
+      echo "'$x'" >|
+    end
+    EOI
+    ''
+    ''
+    'a'
+    ''
+    ''
+    'b'
+    ''
+    EOO
+
+  : typed
+  :
+  $c <<EOI && $b >>/EOO
+    echo "a b" | for -w x [dir_path]
+      echo $x >|
+    end
+    EOI
+    a/
+    b/
+    EOO
+
+  : nested
+  :
+  $c <<EOI && $b >>EOO
+    echo "a b" | for -w x
+      echo "x y" | for -w y
+        echo "'$x $y'" >|
+      end
+    end
+    EOI
+    'a x'
+    'a y'
+    'b x'
+    'b y'
+    EOO
+
+  : nested-diag
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    echo "a b" | for -w x
+      echo "x y" | for -w y
+        echo "'$x $y'" >"'a x'"
+      end
+    end
+    EOI
+    testscript:3:5: error: echo stdout doesn't match expected
+      info: stdout: test/1/stdout-i1-i2-n3
+      info: expected stdout: test/1/stdout-i1-i2-n3.orig
+      info: stdout diff: test/1/stdout-i1-i2-n3.diff
+    %.+
+    EOE
+
+  : nested-diag-test-id
+  :
+  $c <<EOI && $b 2>>EOE != 0
+    echo "a b" | for -w x
+      echo "x y" | for -w y
+        test -f $x$y
+      end
+    end
+    EOI
+    testscript:3:5: error: builtin test exited with code 1
+      info: test id: 1
+    EOE
+
+  : var-value
+  :
+  $c <<EOI && $b >>EOO
+    x = 'x';
+    echo "a b" | for -w x
+    end;
+    echo $x >|
+    EOI
+    b
+    EOO
+
+  : both-sep-options
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    echo "a b" | for -n -w x
+      echo $x >|
+    end
+    EOI
+    testscript:1:1: error: for: both -n|--newline and -w|--whitespace specified
+    %.+
+    EOE
+
+  : invalid-option
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    echo "a b" | for -a x
+      echo $x >|
+    end
+    EOI
+    testscript:1:1: error: for: unknown option '-a'
+    %.+
+    EOE
+
+  : no-variable
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    echo "a b" | for -w
+      echo $x >|
+    end
+    EOI
+    testscript:1:1: error: for: missing variable name
+    %.+
+    EOE
+
+  : special-var
+  :
+  $c <<EOI && $b 2>>EOE != 0
+    echo "a b" | for -w ~
+      echo $* >|
+    end
+    EOI
+    testscript:1:1: error: attempt to set '~' variable directly
+      info: test id: 1
+    EOE
+
+  : unsep-attrs
+  :
+  $c <<EOI && $b 2>>EOE != 0
+    echo "a b" | for -w x[string]
+      echo $x >|
+    end
+    EOI
+    testscript:1:1: error: for: expected variable name instead of x[string]
+      info: test id: 1
+    EOE
+
+  : misuse
+  :
+  {
+    : after-var
+    :
+    $c <<EOI && $b 2>>EOE != 0
+      echo "a b" | for v:
+        echo $v >|
+      end
+      EOI
+      testscript:1:19: error: expected newline instead of ':'
+      EOE
+
+    : after-attrs
+    :
+    $c <<EOI && $b 2>>EOE != 0
+      echo "a b" | for v [string]:
+        echo $v >|
+      end
+      EOI
+      testscript:1:28: error: expected newline instead of ':'
+      EOE
+  }
+
+  : exit
+  :
+  $c <<EOI && $b >>EOO
+    echo "a b" | for x
+      echo "$x" >|
+      exit
+    end
+    EOI
+    a
+    EOO
+
+  : error
+  :
+  $c <<EOI && $b >>EOO 2>>EOE != 0
+    echo "a b" | for x
+      echo "$x" >|
+      exit 'fed up'
+    end
+    EOI
+    a
+    EOO
+    testscript:3:3: error: fed up
+      info: test id: 1
+    EOE
+}
+
+: form-3
+:
+: for x <...
+:
+{
+  : whitespace-split
+  :
+  $c <<EOI && $b >>EOO
+    for -w x <" a b "
+      echo "'$x'" >|
+    end
+    EOI
+    'a'
+    'b'
+    EOO
+
+  : quoted-opt
+  :
+  $c <<EOI && $b >>EOO
+    o = -n
+    for "$o" x <<EOF
+      a
+      b
+      EOF
+      echo "'$x'" >|
+    end;
+    for "($o)" x <<EOF
+      c
+      d
+      EOF
+      echo "'$x'" >|
+    end
+    EOI
+    'a'
+    'b'
+    'c'
+    'd'
+    EOO
+
+  : newline-split
+  :
+  $c <<EOI && $b >>EOO
+    for -n x <<EOF
+
+
+    a
+
+
+    b
+
+    EOF
+      echo "'$x'" >|
+    end
+    EOI
+    ''
+    ''
+    'a'
+    ''
+    ''
+    'b'
+    ''
+    EOO
+
+  : string-before-var
+  :
+  $c <<EOI && $b >>EOO
+    for <"a b" -w x
+      echo "'$x'" >|
+    end
+    EOI
+    'a'
+    'b'
+    EOO
+
+  : here-doc-before-var
+  :
+  $c <<EOI && $b >>EOO
+    for <<EOF -n x
+    a
+    b
+    EOF
+      echo "'$x'" >|
+    end
+    EOI
+    'a'
+    'b'
+    EOO
+
+  : typed
+  :
+  $c <<EOI && $b >>/EOO
+    for -w x [dir_path] <"a b"
+      echo $x >|
+    end
+    EOI
+    a/
+    b/
+    EOO
+
+  : typed-no-ops
+  :
+  $c <<EOI && $b >>/EOO
+    for x [dir_path] <"a b"
+      echo $x >|
+    end
+    EOI
+    a/
+    b/
+    EOO
+
+  : nested
+  :
+  $c <<EOI && $b >>EOO
+    for -w x <"a b"
+      for -w y <"x y"
+        echo "'$x $y'" >|
+      end
+    end
+    EOI
+    'a x'
+    'a y'
+    'b x'
+    'b y'
+    EOO
+
+  : nested-diag
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    for -w x <"a b"
+      for -w y <"x y"
+        echo "'$x $y'" >"'a x'"
+      end
+    end
+    EOI
+    testscript:3:5: error: echo stdout doesn't match expected
+      info: stdout: test/1/stdout-i1-i2-n3
+      info: expected stdout: test/1/stdout-i1-i2-n3.orig
+      info: stdout diff: test/1/stdout-i1-i2-n3.diff
+    %.+
+    EOE
+
+  : nested-diag-test-id
+  :
+  $c <<EOI && $b 2>>EOE != 0
+    for -w x <"a b"
+      for -w y <"x y"
+        test -f $x$y
+      end
+    end
+    EOI
+    testscript:3:5: error: builtin test exited with code 1
+      info: test id: 1
+    EOE
+
+  : var-value
+  :
+  $c <<EOI && $b >>EOO
+    x = 'x';
+    for -w x <"a b"
+    end;
+    echo $x >|
+    EOI
+    b
+    EOO
+
+  : invalid-option
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    for -a x <"a b"
+      echo $x >|
+    end
+    EOI
+    testscript:1:1: error: for: unknown option '-a'
+    %.
+    EOE
+
+
+  : no-variable
+  :
+  $c <<EOI && $b 2>>/~%EOE% != 0
+    for -w <"a b"
+      echo $x >|
+    end
+    EOI
+    testscript:1:1: error: for: missing variable name
+    %.
+    EOE
+
+  : special-var
+  :
+  $c <<EOI && $b 2>>EOE != 0
+    for ~ <"a b"
+      echo $~ >|
+    end
+    EOI
+    testscript:1:5: error: attempt to set '~' variable directly
+    EOE
+
+  : exit
+  :
+  $c <<EOI && $b >>EOO
+    for x <"a b"
+      echo "$x" >|
+      exit
+    end
+    EOI
+    a
+    EOO
+
+  : error
+  :
+  $c <<EOI && $b >>EOO 2>>EOE != 0
+    for x <"a b"
+      echo "$x" >|
+      exit 'fed up'
+    end
+    EOI
+    a
+    EOO
+    testscript:3:3: error: fed up
+      info: test id: 1
+    EOE
+}
diff --git a/tests/test/script/runner/pipe.testscript b/tests/test/script/runner/pipe.testscript
index 205fd55..cdd30a6 100644
--- a/tests/test/script/runner/pipe.testscript
+++ b/tests/test/script/runner/pipe.testscript
@@ -6,7 +6,6 @@
 $c <'cat <foo | $* -i 1 >foo' && $b  : builtin-to-process
 $c <'$* -o foo | cat >foo' && $b     : process-to-builtin
 
-
 : failure
 :
 : Note that while both commands for the pipe are faulty the diagnostics for
@@ -15,19 +14,28 @@ $c <'$* -o foo | cat >foo' && $b     : process-to-builtin
 {
   : exit-code
   :
-  $c <'$* -o foo -s 1 | $* -i 1 >foo -s 2' && $b 2>>/~%EOE% != 0
-  %testscript:1:1: error: .+ exited with code 2%
-    info: stdout: test/1/stdout-2
+  : Also verify that the command line is printed.
+  :
+  $c <'$* -o foo -s 1 | $* -i 1 -s 2 >foo' && $b --verbose 1 2>>/~%EOE% != 0
+  %.
+  %testscript:1:1: error: process .+ exited with code 1%
+  %  info: command line: .+driver.* -o foo -s 1%
+    info: test id: 1
+  %.
+  %testscript:1:1: error: process .+ exited with code 2%
+  %  info: command line: .+driver.* -i 1 -s 2%
+    info: stdout: test/1/stdout-c2
     info: test id: 1
+  %.{2}
   EOE
 
   : stderr
   :
   $c <'$* -o foo -e foo 2>bar | $* -i 2 2>baz' && $b 2>>/~%EOE% != 0
   %testscript:1:1: error: .+ stderr doesn't match expected%
-    info: stderr: test/1/stderr-2
-    info: expected stderr: test/1/stderr-2.orig
-    info: stderr diff: test/1/stderr-2.diff
+    info: stderr: test/1/stderr-c2
+    info: expected stderr: test/1/stderr-c2.orig
+    info: stderr diff: test/1/stderr-c2.diff
   %.{3}
   -baz
   +foo
diff --git a/tests/test/script/runner/redirect.testscript b/tests/test/script/runner/redirect.testscript
index 0fe3aa3..209c4ce 100644
--- a/tests/test/script/runner/redirect.testscript
+++ b/tests/test/script/runner/redirect.testscript
@@ -654,9 +654,9 @@ psr = ($cxx.target.class != 'windows' ? '/' : '\\') # Path separator in regex.
     $* -o bar >?out
     EOI
     %testscript:2: error: ../../../../../driver(.exe)? stdout doesn't match expected%
-      info: stdout: test/1/stdout-2
+      info: stdout: test/1/stdout-n2
       info: expected stdout: test/1/out
-      info: stdout diff: test/1/stdout-2.diff
+      info: stdout diff: test/1/stdout-n2.diff
     %--- \.*%
     %\+\+\+ \.*%
     %@@ \.*%
diff --git a/tests/test/script/runner/set.testscript b/tests/test/script/runner/set.testscript
index b2944a3..1800a7d 100644
--- a/tests/test/script/runner/set.testscript
+++ b/tests/test/script/runner/set.testscript
@@ -76,7 +76,7 @@
 
   : empty-attrs
   :
-  $c <"set '' baz" && $b 2>>EOE != 0
+  $c <"set baz ''" && $b 2>>EOE != 0
   testscript:1:1: error: set: empty variable attributes
     info: test id: 1
   EOE
@@ -300,7 +300,7 @@
   $c <<EOI && $b 2>>~%EOE% != 0
   $* -o 'foo' -l 10 | env -t 1 -- set bar
   EOI
-  %testscript:.*: error: set terminated: execution timeout expired%
+  %testscript:.*: error: .+driver.* terminated: execution timeout expired%
   %.
   EOE
 
@@ -326,23 +326,218 @@
     echo "$s" >=f;
     $* -o 'foo' -l 10 | cat f - | env -t 2 -- set bar
     EOI
-    %testscript:.*: error: set terminated: execution timeout expired%
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: builtin cat terminated: execution timeout expired%
     %.
     EOE
 
     : success
     :
-    : Note that the cat builtin ends up with the 'broken pipe' diagnostics or
-    : similar.
-    :
     $c <<EOI && $b
     echo "$s" >=f;
     timeout --success 2;
-    $* -o 'foo' -l 10 | cat f - 2>>~%EOE% | set bar
-      %cat: .+%
-      EOE
+
+    # Suppress cat's 'broken pipe' diagnostics.
+    #
+    $* -o 'foo' -l 10 | cat f - 2>- | set bar
     EOI
   }
+
+  : split
+  :
+  : Test various splitting modes as above, but now reading the stream in the
+  : non-blocking mode.
+  :
+  {
+    : whitespace-separated-list
+    :
+    {
+      : non-exact
+      :
+      {
+        : non-empty
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -w baz <' foo   bar ';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >'"foo" "bar"'
+        EOI
+
+        : empty
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -w baz <:'';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >''
+        EOI
+
+        : spaces
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -w baz <'  ';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >''
+        EOI
+      }
+
+      : exact
+      :
+      {
+        : trailing-ws
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set --exact --whitespace baz <' foo   bar ';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >'"foo" "bar" ""'
+        EOI
+
+        : no-trailing-ws
+        :
+        : Note that we need to strip the default trailing newline as well with the
+        : ':' modifier.
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -e -w baz <:' foo bar';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >'"foo" "bar"'
+        EOI
+
+        : empty
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -e -w baz <:'';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >''
+        EOI
+
+        : spaces
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -e -w baz <'  ';
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >'""'
+        EOI
+      }
+    }
+
+    : newline-separated-list
+    :
+    {
+      : non-exact
+      :
+      $c <<EOI && $b
+      timeout 10;
+      set -n baz <<EOF;
+
+      foo
+
+      bar
+
+      EOF
+      echo $regex.apply($baz, '^(.*)$', '"\1"') >'"" "foo" "" "bar" ""'
+      EOI
+
+      : exact
+      :
+      {
+        : trailing-newline
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set --exact --newline baz <<EOF;
+
+        foo
+
+        bar
+
+        EOF
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >'"" "foo" "" "bar" "" ""'
+        EOI
+
+        : no-trailing-newline
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set --exact --newline baz <<:EOF;
+
+        foo
+
+        bar
+        EOF
+        echo $regex.apply($baz, '^(.*)$', '"\1"') >'"" "foo" "" "bar"'
+        EOI
+      }
+    }
+
+    : string
+    :
+    {
+      : non-exact
+      :
+      $c <<EOI && $b
+      timeout 10;
+      set baz <<EOF;
+
+      foo
+
+      bar
+
+      EOF
+      echo ($baz[0]) >>EOO
+
+      foo
+
+      bar
+
+      EOO
+      EOI
+
+      : exact
+      :
+      : Note that echo adds the trailing newline, so EOF and EOO here-documents
+      : differ by this newline.
+      :
+      {
+        : trailing-newline
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -e baz <<EOF;
+
+        foo
+
+        bar
+        EOF
+        echo ($baz[0]) >>EOO
+
+        foo
+
+        bar
+
+        EOO
+        EOI
+
+        : no-trailing-newline
+        :
+        $c <<EOI && $b
+        timeout 10;
+        set -e baz <<:EOF;
+
+        foo
+
+        bar
+        EOF
+        echo ($baz[0]) >>EOO
+
+        foo
+
+        bar
+        EOO
+        EOI
+      }
+    }
+  }
 }
 
 : attributes
@@ -351,14 +546,14 @@
   : dir_path
   :
   $c <<EOI && $b
-  set [dir_path] bar <'foo';
+  set bar [dir_path] <'foo';
   echo $bar >/'foo/'
   EOI
 
   : null
   :
   $c <<EOI && $b
-  set [null] foo <-;
+  set foo [null] <-;
   echo $foo >''
   EOI
 
@@ -376,7 +571,7 @@
   : empty-brackets
   :
   $c <<EOI && $b 2>>EOE != 0
-  set -w '[]' baz <'foo bar';
+  set -w baz '[]' <'foo bar';
   echo "$baz"
   EOI
   testscript:2:8: error: concatenating variable expansion contains multiple values
@@ -385,7 +580,7 @@
   : no-left-bracket
   :
   $c <<EOI && $b 2>>EOE != 0
-  set -w x baz
+  set -w baz x
   EOI
   <attributes>:1:1: error: expected '[' instead of 'x'
     testscript:1:1: info: while parsing attributes 'x'
@@ -395,7 +590,7 @@
   : unknown
   :
   $c <<EOI && $b 2>>EOE != 0
-  set -w [x] baz
+  set -w baz [x]
   EOI
   <attributes>:1:1: error: unknown value attribute x
     testscript:1:1: info: while parsing attributes '[x]'
@@ -405,7 +600,7 @@
   : junk
   :
   $c <<EOI && $b 2>>EOE != 0
-  set -w '[string] x' baz
+  set -w baz '[string] x'
   EOI
   <attributes>:1:10: error: trailing junk after ']'
     testscript:1:1: info: while parsing attributes '[string] x'
diff --git a/tests/test/script/runner/status.testscript b/tests/test/script/runner/status.testscript
index e4586d9..461fd5c 100644
--- a/tests/test/script/runner/status.testscript
+++ b/tests/test/script/runner/status.testscript
@@ -15,7 +15,7 @@ b += --no-column
   : false
   :
   $c <'$* -s 1 == 0' && $b 2>>/~%EOE%d != 0
-  %testscript:1: error: ../../../../driver(.exe)? exit code 1 != 0%
+  %testscript:1: error: process ../../../../driver(.exe)? exit code 1 != 0%
     info: test id: 1
   EOE
 }
@@ -30,7 +30,7 @@ b += --no-column
   : false
   :
   $c <'$* -s 1 != 1' && $b 2>>/~%EOE% != 0
-  %testscript:1: error: ../../../../driver(.exe)? exit code 1 == 1%
+  %testscript:1: error: process ../../../../driver(.exe)? exit code 1 == 1%
     info: test id: 1
   EOE
 }
@@ -38,7 +38,7 @@ b += --no-column
 : error
 :
 $c <'$* -s 1 -e "Error"' && $b 2>>/~%EOE% != 0
-%testscript:1: error: ../../../driver(.exe)? exited with code 1%
+%testscript:1: error: process ../../../driver(.exe)? exited with code 1%
   info: stderr: test/1/stderr
 Error
   info: test id: 1
@@ -47,7 +47,7 @@ EOE
 : error-check
 :
 $c <'$* -s 1 -e "Error" == 0' && $b 2>>/~%EOE% != 0
-%testscript:1: error: ../../../driver(.exe)? exit code 1 != 0%
+%testscript:1: error: process ../../../driver(.exe)? exit code 1 != 0%
   info: stderr: test/1/stderr
 Error
   info: test id: 1
diff --git a/tests/test/script/runner/timeout.testscript b/tests/test/script/runner/timeout.testscript
index 5f87d39..f9b6ec7 100644
--- a/tests/test/script/runner/timeout.testscript
+++ b/tests/test/script/runner/timeout.testscript
@@ -424,7 +424,9 @@
   $c <<EOI && $b 2>>~%EOE% != 0
   env -t 1 -- $* -l 86400 -o 'foo' | touch $~/foo/bar
   EOI
-  %testscript:.*: error: touch exited with code 1%
+  %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
+  %.
+  %testscript:.*: error: builtin touch exited with code 1%
   %.+
   EOE
 }
@@ -435,42 +437,54 @@
   : prog-tm-prog
   :
   $c <'$* -l 10 | env -t 1 -- $* -i 0' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: .+driver.* terminated: execution timeout expired%
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
     %.
     EOE
 
   : tm-prog-prog
   :
   $c <'env -t 1 -- $* -l 10 | $* -i 0' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: .+driver.* terminated: execution timeout expired%
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
     %.
     EOE
 
   : tm-cat-prog
   :
-  $c <'env -t 1 -- cat <"test" | $* -l 10' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: cat terminated: execution timeout expired%
+  $c <'env -t 3 -- cat <"test" | $* -l 10' && $b 2>>~%EOE% != 0
+    %testscript:.*: error: builtin cat terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
     %.
     EOE
 
   : cat-tm-prog
   :
   $c <'cat <"test" | env -t 1 -- $* -l 10' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: .+driver.* terminated: execution timeout expired%
+    %testscript:.*: error: builtin cat terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
     %.
     EOE
 
   : tm-prog-cat
   :
   $c <'env -t 1 -- $* -l 10 | cat >-' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: .+driver.* terminated: execution timeout expired%
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: builtin cat terminated: execution timeout expired%
     %.
     EOE
 
   : tm-echo-prog
   :
-  $c <'env -t 1 -- echo "test" | $* -l 10' && $b 2>>~%EOE% != 0
-    %testscript:.*: error: echo terminated: execution timeout expired%
+  $c <'env -t 3 -- echo "test" | $* -l 10' && $b 2>>~%EOE% != 0
+    %testscript:.*: error: builtin echo terminated: execution timeout expired%
+    %.
+    %testscript:.*: error: process .+driver.* terminated: execution timeout expired%
     %.
     EOE
 
diff --git a/tests/test/script/runner/while.testscript b/tests/test/script/runner/while.testscript
new file mode 100644
index 0000000..1c58827
--- /dev/null
+++ b/tests/test/script/runner/while.testscript
@@ -0,0 +1,16 @@
+# file      : tests/test/script/runner/while.testscript
+# license   : MIT; see accompanying LICENSE file
+
+.include ../common.testscript
+
+: basics
+:
+$c <<EOI && $b >>EOO
+  while ($v != "aa")
+    echo "$v" >|
+    v = "$(v)a"
+  end
+  EOI
+
+  a
+  EOO