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There are several theories about how to tell when a builtin is overridable, for example if prototype 'CORE::foo' is defined foo is overridable. That's mostly true, but there are exceptions.

Here's a quick way to tell:

$ perl -e'BEGIN{ *CORE::GLOBAL::use = sub{1};} use CGI qw/:standard/; +print header' Content-Type: text/html; charset=ISO-8859-1 $
The override didn't take, so use is what it is.

A simpler version:

$ perl -e'use Fatal qw/use/;' Cannot make a non-overridable builtin fatal at /usr/lib/perl5/5.8.4/Fa line 108. BEGIN failed--compilation aborted at -e line 1. $
Unfortunately, Fatal uses the defined prototype rule to decide that.

After Compline,

In reply to Re: Overriding 'use'? by Zaxo
in thread Overriding 'use'? by Anonymous Monk

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