don't blame $x if reftype($x)/refaddr($x) is undef #23593
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When the "Use of uninitialized value" warning tries to find the source
of the problem, it skips over builtin::reftype/builtin::refaddr
operations and blames their arguments:
$ perl -wE 'my $x = 42; $_ = reftype($x) eq ""'
Use of uninitialized value $x in string eq at -e line 1.
$ perl -wE 'my $x = 42; $_ = refaddr($x) eq ""'
Use of uninitialized value $x in string eq at -e line 1.
This is wrong because $x is clearly defined.
This patch teaches S_find_uninit_var that reftype/refaddr can return
undef even if their arguments are perfectly defined.
Fixes Perl#19273.
khwilliamson
approved these changes
Aug 17, 2025
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When the "Use of uninitialized value" warning tries to find the source of the problem, it skips over builtin::reftype/builtin::refaddr operations and blames their arguments:
This is wrong because $x is clearly defined.
This patch teaches S_find_uninit_var that reftype/refaddr can return undef even if their arguments are perfectly defined.
Fixes #19273.