[issue26015] Add new tests for pickling iterators of mutable sequences

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In 2.7 iterators are not pickleable.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions:  -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26015>
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