[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,
my test works for me. It can be either
>>> a = [1, 2, 3]
or
>>> a = iter([1, 2, 3])
, no matter: both objects will be +1 referenced after taking
>>> b = islice(a, 1)
. 
My test failed without patch and passed with one.

But your test is more straightforward, thanks.
Attaching patches with your test.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21321>
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