Class F

Lib/test/test_math.py:2402–2405

        # A SystemError should not be raised if the first arg to atan2(),
        # copysign(), or remainder() cannot be converted to a float.
        class F:
            def __float__(self):
                self.converted = True
                1/0
        for func in math.atan2, math.copysign, math.remainder:
            y = F()
            with self.assertRaises(TypeError):