[issue3720] segfault in for loop with evil iterator

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

I think PyObject_NextNotImplemented should be renamed to
_PyObject_NextNotImplemented. Aside from that, I think the patch is
ready for committing.

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nosy: +benjamin.peterson

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3720>
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