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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 004e3870d9e6 by Victor Stinner in branch '3.4':
Issue #23571: If io.TextIOWrapper constructor fails in _Py_DisplaySourceLine(),
https://hg.python.org/cpython/rev/004e3870d9e6

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