Yes. You can experiment with simpler 
foo($hash{ undef() });

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^2: Inconsistency of 'Use of uninitialized value in scalar assignment' warning by choroba
in thread Inconsistency of 'Use of uninitialized value in scalar assignment' warning by ccn

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