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#!/usr/bin/env perl use warnings; ... foo bar unintended stringification at test.pl line 34. Can't locate object method "str" via package "foo bar" (perhaps you fo +rgot to load "foo bar"?) at test.pl line 35.
$ perl -MO=Concise,-src test.pl | perl -ne \ '/^#\s+\d+\s*:/&&($a=$_);/(?<!ex-)stringify/&&print$a,$_' test.pl syntax OK # 34: my $zz; $zz = "$x $y"; # warns 1a <@> stringify[$zz:257,258] sK/TARGMY,1 ->1b