[3.6] bpo-31249: Fix ref cycle in ThreadPoolExecutor #3253
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* bpo-31249: Fix ref cycle in ThreadPoolExecutor concurrent.futures: WorkItem.run() used by ThreadPoolExecutor now breaks a reference cycle between an exception object and the WorkItem object. ThreadPoolExecutor.shutdown() now also clears its threads set. * shutdown() now only clears threads if wait is true. * Revert changes on shutdown() (cherry picked from commit bc61315)
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test_concurrent_futures checks also dangling threads.
https://bugs.python.org/issue31249