By the time Perl compiles the use warn; statement, it's already decided that the first warn refers to the builtin warn. Perl won't go back and recompile code it's already compiled when you override a keyword (that's not possible in some cases).

In reply to Re: Overriding CORE::GLOBAL::warn/die by chromatic
in thread Overriding CORE::GLOBAL::warn/die by clueless newbie

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