I'm not sure what bug you're talking about. The fact that Data::Dumper can't dump code references is documented:
"Data::Dumper" cheats with CODE references. If a code reference is encountered in the structure being processed (and if you haven't set the "Deparse" flag), an anonymous subroutine that contains the string '"DUMMY"' will be inserted in its place, and a warning will be printed if "Purity" is set.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: doubts about Data::Dumper output by choroba
in thread doubts about Data::Dumper output by Discipulus

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