Nick Coghlan added the comment:

Updated patch for Serhiy's review comments: 
issue23722_classcell_reference_validation_v2.diff

- avoids a spurious deprecation warning for metaclasses that don't return a 
type() instance at all
- avoids even the appearance of a refleak in the __build_class__ fallback code
- integrates the documentation into the main patch

----------
Added file: 
http://bugs.python.org/file45748/issue23722_classcell_reference_validation_v2.diff

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