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#!/usr/bin/perl

...
my $foo = 42;
my $bar = 43;
eval '$'.'foo++';

Unused variable my $bar at ./warntest.pl line 8.

Unused variable my $foo at ./warntest.pl line 7.
Unused variable my $bar at ./warntest.pl line 8.
$foo++%

Unused variable my $bar at ./warntest.pl line 8.