So deactivate it: 

>perl -wle"sub real_AUTOLOAD { undef &AUTOLOAD; } sub AUTOLOAD { print
+ 'A'; goto &real_AUTOLOAD } f() for 1..2;"
A
Undefined subroutine &main::f called at -e line 1.

[download]

Getting rid of the whole glob works too: 

>perl -wle"sub AUTOLOAD { print 'A'; undef *AUTOLOAD; } f() for 1..2;"
A
Undefined subroutine &main::f called at -e line 1.

[download]

In reply to Re: undef-ing an active subroutine by ikegami
in thread undef-ing an active subroutine by perl5ever

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