ERROR: test_threading_module_has_signatures (__main__.TestSignatureDefinitions.test_threading_module_has_signatures) [supported] (builtin='excepthook')
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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