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For example:
print $(dir/:var)
print $(file{target}:var)
print $(dir/file{target}:var)
Note that if the scope/target does not (yet) exists, it will be created.
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For example:
v = [null]
v = [string] abc
v += ABC # abcABC
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Now we can do:
[string] str = foo
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For example:
cxx{*-options}: dist = true
1. Only single '*' wildcard is supported, matches 0 or more characters.
2. If target type is not specified, it defaults to any target.
3. Appending (+=) is not allowed.
4. The value is expanded immediately in the context of the scope.
5. The more specific pattern (i.e., with the shortest "stem") is preferred.
If the stem has the same length, then the last defined (but not redefined)
pattern is used. This will probably have to change to become an error.
See tests/variable/type-pattern for more examples.
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For now it acts as just the value mode that can be enabled anywhere
variable expansion is supported, for example:
(foo=bar):
And the primary use currently is to enable/test quoted and indirect
variable expansion:
"foo bar" = FOO BAR
print $"foo bar" # Invalid.
print $("foo bar") # Yeah, baby.
foo = FOO
FOO = foo
print $($foo)
Not that you should do something like this...
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