[issue28884] Python 3.5.2 non-segfaulting bugs (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(B6) this program fails the check for no sys.exc_info(), even though at
  the point this assert runs (called from the <== line) we are not in
  any except/finally block.  This is a generalization of
  test_exceptions:test_generator_doesnt_retain_old_exc::

    import sys

    def g():
        try:
            raise ValueError
        except ValueError:
            yield 1
        assert sys.exc_info() == (None, None, None)
        yield 2

    gen = g()

    try:
        raise IndexError
    except IndexError:
        assert next(gen) is 1
    assert next(gen) is 2    # <==

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<http://bugs.python.org/issue28884>
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