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

[Mario Corchero]

Mario Corchero <mariocj89 at gmail.com> added the comment:

Having not looked deeply at it but with the reproducer, running a quick bisect, it points to this commit: https://github.com/python/cpython/commit/77b3b7701a34ecf6316469e05b79bb91de2addfa 
I'll try having a look later at the day if I can manage to free some time.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39578>
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