I just now noticed Sub::Metadata, which allows you to retrieve (and manipulate) the prototype (but not the signature) of a subroutine. Maybe that one could help you here.

The module claims to work even with Perl 5.6, so most Perl versions should be supported.

In reply to Re^7: Monkey patching all subs with a basic 'starting subname' message by Corion
in thread Monkey patching all subs with a basic 'starting subname' message by Anonymous Monk

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