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#!/usr/bin/env perl -l

...
else {
    print 'true';
}

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Use of uninitialized value $test_hash{"unset_key"} in pattern match (m
+//) at ./pm_example.pl line 8.
false
Use of uninitialized value $test_hash{"unset_key"} in pattern match (m
+//) at ./pm_example.pl line 15.
false