python -c "from unittest.mock import MagicMock as MM; from _pickle import load;
 load(MM())"
python: Objects/typeobject.c:5583: _PyType_LookupRef: Assertion `!PyErr_Occurred()' failed.
Aborted

python -c "from unittest.mock import MagicMock as MM; from _pickle import load; load(MM())"
TypeError: a bytes-like object is required, not 'MagicMock'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
    from unittest.mock import MagicMock as MM; from _pickle import load; load(MM())
                                                                         ~~~~^^^^^^
  File "/home/danzin/projects/cpython/Lib/unittest/mock.py", line 1168, in __call__
    self._mock_check_sig(*args, **kwargs)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
SystemError: <function CallableMixin._mock_check_sig at 0x7feb149cf8a0> returned a result with an exception set