p4 is a Perl-based macro processor that is useful when cpp and m4 are insufficient. License: GNU General Public License v2 Changes: This release added an anonymous function syntax &() for returning values and changed &{} to eval code and not return a value. &{} now replaces the previous usage of ${} to eval code without returning a value which might actually return a value in edge cases (e.g ${$foo = 0}).

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