Two CPAN modules come to mind Devel::Symdump and Module::Info (and its cousin Module::Info::File). Whereas Devel::Symdump doesn't discriminate between subs your module declares and subs exported into your module, Module::Info does.

In reply to Re: Checking for duplicate subroutine names by clueless newbie
in thread Checking for duplicate subroutine names by SirBones

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