Class C_with_slots_dict

Lib/test/test_descr.py:4298–4299

        self.assertEqual(repr(c), '<A_with_slots>')

        class C_with_slots_dict(A_with_slots):
            pass
        c = C_with_slots_dict()
        with self.assertRaisesRegex(TypeError, 'layout differs'):
            C_with_slots_dict.__bases__ = (A_with_dict_weakref,)