[issue40050] test_importlib leaked [6303, 6299, 6303] references

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

https://buildbot.python.org/all/#/builders/206/builds/119

test_importlib leaked [6303, 6299, 6303] references, sum=18905
test_importlib leaked [2022, 2020, 2022] memory blocks, sum=6064

Issue reported at: https://bugs.python.org/issue1635741#msg364845

It seems like the regression was introduced by the following change:

commit 8334f30a74abcf7e469b901afc307887aa85a888 (HEAD)
Author: Hai Shi <shihai1992 at gmail.com>
Date:   Fri Mar 20 16:16:45 2020 +0800

    bpo-1635741: Port _weakref extension module to multiphase initialization (PEP 489) (GH-19084)

----------
components: Tests
messages: 364905
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_importlib leaked [6303, 6299, 6303] references
versions: Python 3.9

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