Class CustomRLock

Lib/test/test_threading.py:2337–2339

        # Subtypes with custom `__init__` are allowed (but, not recommended):
        class CustomRLock(self.locktype):
            def __init__(self, a, *, b) -> None:
                super().__init__()

        with warnings.catch_warnings(record=True) as warnings_log:
            CustomRLock(1, b=2)