[issue31588] SystemError in class creation in case of a metaclass with a bad __prepare__() method

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I'm not a metaclass expert. Eric, Nick, could you please take a look at the patch?

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versions: +Python 2.7, Python 3.6

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<https://bugs.python.org/issue31588>
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