Class M4

Lib/test/test_patma.py:55–56

        class M3(collections.UserDict, C, list):
            pass
        class M4(dict, collections.abc.Sequence, C):
            pass
        self.assertEqual(self.check_sequence_then_mapping(M1()), "map")
        self.assertEqual(self.check_sequence_then_mapping(M2()), "map")
        self.assertEqual(self.check_sequence_then_mapping(M3()), "map")