[issue23722] During metaclass.__init__, super() of the constructed class does not work

[Nick Coghlan]

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

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

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