ERROR: test_threading_module_has_signatures (__main__.TestSignatureDefinitions.test_threading_module_has_signatures) [supported] (builtin='excepthook')----------------------------------------------------------------------Traceback (most recent call last):  File "/home/peter/develop/cpython/Lib/test/test_inspect/test_inspect.py", line 5717, in _test_module_has_signatures    self.assertIsNotNone(inspect.signature(obj))                         ~~~~~~~~~~~~~~~~~^^^^^  File "/home/peter/develop/cpython/Lib/inspect.py", line 3312, in signature    return Signature.from_callable(obj, follow_wrapped=follow_wrapped,           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                   globals=globals, locals=locals, eval_str=eval_str,                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                   annotation_format=annotation_format)                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/home/peter/develop/cpython/Lib/inspect.py", line 3027, in from_callable    return _signature_from_callable(obj, sigcls=cls,                                    follow_wrapper_chains=follow_wrapped,                                    globals=globals, locals=locals, eval_str=eval_str,                                    annotation_format=annotation_format)  File "/home/peter/develop/cpython/Lib/inspect.py", line 2508, in _signature_from_callable    return _signature_from_builtin(sigcls, obj,                                   skip_bound_arg=skip_bound_arg)  File "/home/peter/develop/cpython/Lib/inspect.py", line 2294, in _signature_from_builtin    return _signature_fromstr(cls, func, s, skip_bound_arg)  File "/home/peter/develop/cpython/Lib/inspect.py", line 2150, in _signature_fromstr    raise ValueError("{!r} builtin has invalid signature".format(obj))ValueError: <built-in function _excepthook> builtin has invalid signature