[issue42250] test_ast leaked [23640, 23636, 23640] references

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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components: +Tests
nosy: +BTaskaya, vstinner -pablogsal
versions: +Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42250>
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