Class ValueRange

Lib/test/test_typing.py:9641–9643

        import dataclasses
        @dataclasses.dataclass
        class ValueRange:
            lo: int
            hi: int
        v = ValueRange(1, 2)
        self.assertEqual(get_args(Annotated[int, v] | None),
                         (Annotated[int, v], types.NoneType))