[issue46615] Use-after-free by mutating set during set operations

[Dennis Sweeney]

Change by Dennis Sweeney <sweeney.dennis650 at gmail.com>:


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pull_requests: +29473
pull_request: https://github.com/python/cpython/pull/31312

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46615>
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