[issue22986] Improved handling of __class__ assignment

[Roundup Robot]

Roundup Robot added the comment:

New changeset d3671e6ba106 by Benjamin Peterson in branch 'default':
merge 3.4 (#22986)
https://hg.python.org/cpython/rev/d3671e6ba106

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nosy: +python-dev

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<http://bugs.python.org/issue22986>
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