[issue43234] Prohibit passing non-ThreadPoolExecutor executors to loop.set_default_executor following a deprecation

[Illia Volochii]

Change by Illia Volochii <illia.volochii at gmail.com>:


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keywords: +patch
pull_requests: +23326
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24540

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<https://bugs.python.org/issue43234>
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