[issue28214] Improve exception reporting for problematic __set_name__ attributes

[Nick Coghlan]

Nick Coghlan added the comment:

Slight change, as it makes sense to reference the special method name explicitly:

TypeError: Error calling __set_name__ on 'BadIdea' instance 'attr' in 'NotGoingToWork': 'NoneType' object is not callable

TypeError: Error calling __set_name__ on 'FaultyImplementation' instance 'attr' in 'TheoreticallyCouldWork': ZeroDivisionError: division by zero

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28214>
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