• c_powu: L189 (c_powu() called with n < 100 and mask can't overflow)
• complex_hash: L459, L462 (in current implementation of hashing, -1 is reserved)
• complex_richcompare: L643, L669 (TO_COMPLEX calls are redundant)
• complex_subtype_from_string: L892 (complex_subtype_from_string() helper called only on L949 with unicode object at v)
• actual_complex_new: L960 (PyComplex_Check can't be true here), L960 (test added)
• complex_new_impl: L1028 (test added)
• complex_new_impl: L1034 (here r is not a complex subtype, hence above try_complex_special_method() call was unsuccessful)
• complex_new_impl: L1068 (here r is a complex subtype, hence own_r==1)
• complex_from_number: L1150 (test added)

Line numbers are wrt to complexobject.c at 8a284e189673582e2.

Everything (except for memory errors) should be covered by tests in test_complex.py and test_capi/test_complex.py.

• Issue: More tests for complexobject.c #109802