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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2e14ca478a57 by Victor Stinner in branch 'default':
Issue #23571: PyErr_FormatV() and PyErr_SetObject() now always clear the
https://hg.python.org/cpython/rev/2e14ca478a57

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