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

[STINNER Victor]

STINNER Victor added the comment:

2015-03-03 13:49 GMT+01:00 Serhiy Storchaka <report at bugs.python.org>:
>> If the patch has a significant overhead: _Py_CheckFunctionResult() may be
>> marked to be inlined, and PyCFunction_Call() and PyObject_Call() checks may
>> be marked as unlikely using GCC __builtin_expect(), something like:
>
> Could you please open separate issue or even a topic on Python-Ideas for
> Py_likely/Py_unlikely? I prefer spelling _Py_LIKELY.

I'm not really interested by micro-benchmark here :-) I also propose
solutions *if* my patch makes the code slower.

Since __builtin_expect() may have a negative effect on performances, I
would prefer to avoid it if we can :-)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23571>
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