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Re: Name "main::a" used only once: possible typo

by subogero (Initiate)
on Sep 12, 2017 at 15:56 UTC ( #1199215=note: print w/replies, xml ) Need Help??

in reply to Name "main::a" used only once: possible typo

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:/; };

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