[issue21321] itertools.islice() doesn't release reference to the source iterator when the slice is exhausted

[Anton Afanasyev]

Anton Afanasyev added the comment:

Hi Antoine,
oops you are right about leaks: fixed them in new attached patch.
As for testing changes in "reduce()": they are already covered by "self.pickletest(islice(range(100), *args))". Function "pickletest()" covers case for pickle dumping/loading of exhausted iterator.

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Added file: http://bugs.python.org/file35091/issue21321_3.4_8c8315bac6a8_5.diff

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<http://bugs.python.org/issue21321>
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