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Specifically:
1. In the double-quoted strings we now only do effective escaping of the
special `$("\` characters plus `)` for symmetry.
2. There is now support for "escape sequence expansion" in the form $\X where
\X can be any of the C/C++ simple escape sequences (\n, \t, etc) plus \0
(which in C/C++ is an octal escape sequence). For example:
info "foo$\n$\tbar$\n$\tbaz"
Will print:
buildfile:1:1: info: foo
bar
baz
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in script
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Use this to relax the pattern inclusion/exclusion syntax to only require
unquoted +/-.
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Value subscript is only recognized in evaluation contexts (due to ambiguity
with wildcard patterns; consider: $x[123].txt) and should be unseparated from
the previous token. For example:
x = ($y[1])
x = (($f ? $y : $z)[1])
x = ($identity($y)[$z])
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Before:
x = [string null]
After:
x = [string, null]
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Now it should be possible to use `[]` for wildcard patterns, for example:
foo = foo.[hit]xx
Note that a leading bracket expression will still be recognized as attributes
and escaping or quoting it will inhibit pattern matching. To resolve this case
we need to specify an empty attribute list:
foo = [] [abc]-foo.cxx
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