[issue28214] Improve exception reporting for problematic __set_name__ attributes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Updated patch uses C API added in issue28410. It preserves the traceback of original exception:

Traceback (most recent call last):
  File "issue28214.py", line 3, in __set_name__
    1/0
ZeroDivisionError: division by zero

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "issue28214.py", line 5, in <module>
    class TheoreticallyCouldWork:
RuntimeError: Error calling __set_name__ on 'FaultyImplementation' instance 'attr' in 'TheoreticallyCouldWork'

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Added file: http://bugs.python.org/file45129/set_name_chain_error_cause_2.patch

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