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All the Perl that's Practical to Extract and Report

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  • You can omit the sub keyword only when the closure is the first thing in the parameter list.

    The usual workaround is a do-nothing function with only the closure as prototyped parameter:

    sub as(&;*) { @_ }

    Then you can say

    describe $foo as { $bar + $baz };

    or whatever. Though this is questionable in the sense that it has to be looked up in the documentation, whereas the not-so-pretty solution is plainly obvious to anyone who knows enough Perl.