[issue19005] PyIter_Next crashes if passed a non-iterator

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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components: +Documentation -Interpreter Core
type: crash -> 
versions: +Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19005>
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