UNIVERSAL::isa - Hack around stupid module authors using UNIVERSAL::isa as a function when they shouldn't.
echo 'export PERL5OPT=-MUNIVERSAL::isa' >> /etc/profile
Whenever you use "isa" in UNIVERSAL as a function, a kitten using Test::MockObject dies. Normally, the kittens would be helpless, but if they use UNIVERSAL::isa (the module whose docs you are reading), the kittens can live long and prosper.
This module replaces
UNIVERSAL::isa with a version that makes sure that if it's called as a function on objects which override
isa will be called on those objects as a method.
In all other cases the real
UNIVERSAL::isa is just called directly.
If the lexical warnings pragma is available, a warning will be emitted for each naughty invocation of
UNIVERSAL::isa. These warnings can be silenced by saying:
no warnings 'UNIVERSAL::isa';
in the lexical scope of the naughty code.
UNIVERSAL::can for a more mature discussion of the problem at hand.
Autrijus Tang <firstname.lastname@example.org>
Yuval Kogman <email@example.com>
Same as perl, blah blah blah, (c) 2005