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

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> The GC is supposed to be able to break such cycle, no?

In zip_new(), lz->result tuple is *not* always tracked by the GC.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42536>
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