Its relatively easy to check your code for such constructs because Perl::Critic::Policy is xpaths you can copy this example Perl::Critic::Policy::ValuesAndExpressions::UndefinedBehaviourMaybeQuoteit / $1 not quoted (value not frozen) undefined behaviour

In reply to Re^8: Why does the first $c evaluate to the incremented value ... (check) by Anonymous Monk
in thread Why does the first $c evaluate to the incremented value in [$c, $c += $_] ? by smls

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