In perl.git, the branch smoke-me/davem/proto_undef has been created
<http://perl5.git.perl.org/perl.git/commitdiff/343d03e768e8a0fd8d9aca836df191d819f4e3e8?hp=0000000000000000000000000000000000000000>
at 343d03e768e8a0fd8d9aca836df191d819f4e3e8 (commit)
- Log -----------------------------------------------------------------
commit 343d03e768e8a0fd8d9aca836df191d819f4e3e8
Author: David Mitchell <[email protected]>
Date: Wed May 6 11:56:47 2015 +0100
allow undef as an arg to '&' prototype
RT #123475
Commit e41e9865be5555 (to fix [perl #123062]) restricted the types of
args allowed for a function with a '&' prototype - previously it allowed
array refs and the like. It also removed undef, so this was now a
compile-time error:
sub foo (&) {...}
foo(undef)
However, some CPAN code used the idiom register_callback(undef) to
explicitly disable a registered callback.
So re-allow an explicit undef.
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