[issue28214] Improve exception reporting for problematic __set_name__ attributes

[Nick Coghlan]

Nick Coghlan added the comment:

@property can be used to define a broken __set_name__ attribute:

>>> class BadIdea:
...     @property
...     def __set_name__(self):
...         pass
... 
>>> class NotGoingToWork:
...     attr = BadIdea()
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable

And there's also a failing __set_name__ call:

>>> class FaultyImplementation:
...     def __set_name__(self, *args):
...         1/0
... 
>>> class TheoreticallyCouldWork:
...     attr = FaultyImplementation()
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __set_name__
ZeroDivisionError: division by zero

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