Quoth perldoc -f prototype:

If the builtin is not overridable (such as "qw//") or its arguments cannot be expressed by a prototype (such as "system") returns "undef" because the builtin does not really behave like a Perl function.

In reply to Re: Re: Re: How do I pass a block like map/grep/sort/etc? by Fletch
in thread How do I pass a block like map/grep/sort/etc? by Anonymous Monk

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