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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 52c7017fdcdd by Victor Stinner in branch 'default':
Issue #23571: Oops, fix #ifdef assert()
https://hg.python.org/cpython/rev/52c7017fdcdd

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