[issue23571] Raise SystemError if a function returns a result with an exception set

[STINNER Victor]

STINNER Victor added the comment:

Serhiy was right: we should mention the name of the function in the
exception. In the Django traceback, it's not easy to guess what raised the
SystemError.

Ok to mention the change in What's New in Python 3.5.

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<http://bugs.python.org/issue23571>
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