Try checking the sub's compilation package. I'm using eval to cover just in case the value that was given to sub_package() isn't a code reference or whatever.

use B 'svref_2object';

sub sub_package { eval { svref_2object( shift )->STASH->NAME } }

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In reply to Re: Detecting an imported function by diotalevi
in thread Detecting an imported function by Ovid

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