The funny thing is that even though I->can() doesn't return an error, I->can("can") returns undef. So I can can(), but I->cannot ("can").
perldoc UNIVERSAL says:
Perl magically makes these functions [isa, can, and VERSION] act as methods on all objects.
so I guess that's just Perl magic at work.
Update: in view of ikegami's reply, maybe this is a documentation bug as well. Perhaps s/these functions/all functions in package UNIVERSAL/?
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Not quite.
There's nothing special about those functions. The magic is Perl acting as if UNIVERSAL was in @ISA when doing a method call. Apparently, can doesn't. Bug!
>perl -wle "{ package UNIVERSAL; sub test { '!' } } print I->can('test
+')?1:0;"
0
>perl -wle "{ package UNIVERSAL; sub test { '!' } } print I->test;"
!
The interesting part is
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