This can be difficult for the reasons the other folks have already explained: in Perl, compile time is anytime.

It's not difficult - otherwise we wouldn't have the "used only once" warning. It's not useful because of AUTOLOAD, and not having to declare subroutines. It's the usefulness which makes there's no warning, not whether it's difficult.

Abigail

In reply to Re: Compile-time checking for undef subroutines? by Abigail-II
in thread Compile-time checking for undef subroutines? by mr.dunstan

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