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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:


New changeset 084f80b82c564c8a3cef26fc6e56da188a379be2 by Nick Coghlan (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-31588: Validate return value of __prepare__() methods (GH-3790)
https://github.com/python/cpython/commit/084f80b82c564c8a3cef26fc6e56da188a379be2


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