[issue39578] MagicMock specialisation instance can no longer be passed to new MagicMock instance

[Frank Harrison]

Frank Harrison <frank at doublethefish.com> added the comment:

Minor correction: The regression was only tested on Python 3.9.0a2 (Fedora), Python 3.9a3 (OSX), CPython's master (build from source) and the latest non-prerelease versions of python 3.5, 3.6, 3.7, and 3.8. Tested on OSX and Fedora 31.

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<https://bugs.python.org/issue39578>
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