potion_closure_arity  642 core/objmodel.c   potion_method(clo_vt, "arity", potion_closure_arity, 0);
potion_closure_arity  839 core/potion.h  PN potion_closure_arity(Potion *, PN, PN);
potion_closure_arity  156 test/api/potion-test.c   CuAssertIntEquals(T, "cl arity f2", 2, PN_INT(potion_closure_arity(P,0,p2)));