[issue31249] test_concurrent_futures leaks dangling threads

[STINNER Victor]

STINNER Victor added the comment:


New changeset 489d91c61d02f401551966f1558ee2dc87fc0ad9 by Victor Stinner in branch 'master':
bpo-31249: test_concurrent_futures checks dangling threads (#3167)
https://github.com/python/cpython/commit/489d91c61d02f401551966f1558ee2dc87fc0ad9


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<http://bugs.python.org/issue31249>
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