[issue42536] Iterating on a zip keeps objects alive longer than expected (test_itertools leaks sometimes references)

[Brandt Bucher]

Brandt Bucher <brandtbuc...@gmail.com> added the comment:

Simple demo:

>>> import gc
>>> gc.disable()
>>> z = zip([[]])
>>> gc.is_tracked(next(z))
True
>>> z = zip([[]])
>>> gc.collect()
0
>>> gc.is_tracked(next(z))
False

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<https://bugs.python.org/issue42536>
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