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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