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Do you know where your variables are?

comment on

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The best solution I found so far is this
$SIG{__WARN__} = sub { my $w = shift; warn $w unless $w =~ /::[ab]" used only once:/; };
EDIT: An even better one, preserving an already existing signal handler. It still does not guarantee ours won't be overwritten.
my $orig_warn = $SIG{__WARN__}; $SIG{__WARN__} = $orig_warn ? sub { my $w = shift; $orig_warn->($w) if $w !~ /::[ab]" used onl +y once/ } : sub { my $w = shift; warn $w if $w !~ /::[ab]" used only once/ } +;
EDIT: an even shorter one:
my $abwarn = $SIG{__WARN__} // sub { warn shift }; $SIG{__WARN__} = sub { my $w = shift; $abwarn->($w) if $w !~ /::[ab]" used only once:/; };

In reply to Re: Name "main::a" used only once: possible typo by subogero
in thread Name "main::a" used only once: possible typo by szabgab

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