Class complex2

Lib/test/test_complex.py:626–630

Make sure that __complex__() calls fail if anything other than a complex is returned

                return self

        class complex2(complex):
            """Make sure that __complex__() calls fail if anything other than a
            complex is returned"""
            def __complex__(self):
                return None

        check(complex(complex0(1j)), 0.0, 42.0)
        with self.assertWarns(DeprecationWarning):