yes, add a subroutine in @INC, and interrogate the namespace you're interested in every time before/after loading a module for changes

On the other hand, grep the source

lib/Test/Deep.pm

33:@EXPORT = qw( eq_deeply cmp_deeply cmp_set cmp_bag cmp_methods
34:     useclass noclass set bag subbagof superbagof subsetof superset
+of
165:    # this allows Set and Bag to handle circular refs
429:sub set
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