[issue37126] test_threading is leaking references

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

Łukasz, this PR will fix the x86 Gentoo Refleaks 3.x and friends, so I would recommend landing this before the release.

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nosy: +lukasz.langa

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37126>
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