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#!/usr/bin/perl

...
    my $r = "thirdsub";
    print Dumper $r;
}

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Name "Frob::Dumper" used only once: possible typo at useuse.pl line 31
+.
$VAR1 = 'secsub';
$VAR1 = 'thirdsub';
print() on unopened filehandle Dumper at useuse.pl line 31.