[issue28891] Standardise more behaviours for zero-argument super() __class__ and __classcell__

[Nick Coghlan]

Nick Coghlan added the comment:

Breaking the concrete proposal out to its own post:

- for CPython, "nonlocal __class__" becomes a SyntaxError generated by the symbol table pass in the compiler in 3.7+ and a DeprecationWarning in 3.6.1+
- other implementations (including PyPy) can just make "nonlocal __class__" a SyntaxError immediately
- an explicit test be added to https://hg.python.org/cpython/file/default/Lib/test/test_super.py for 3.6+ that "__class__" and "__classcell__" don't show up in the class locals() during execution of the class body

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28891>
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