in reply to Re: Unit testing built-in functions
in thread Unit testing built-in functions

You can only override some builtins, and those you can override must be overridden by importing the replacement functions from another module.

The former: Yes.

The latter: Um, no. Or at least, not quite: 

~$ perl -le 'BEGIN { *CORE::GLOBAL::unlink = sub(@) { print "@_" } } u
+nlink "aaa".."aad"'
aaa aab aac aad

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print "Just another Perl ${\(trickster and hacker)},"
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In Section Seekers of Perl Wisdom