FAIL: test_free_reference (test.test_concurrent_futures.test_thread_pool.ThreadPoolExecutorTest.test_free_reference)
Re-running test.test_concurrent_futures.test_thread_pool in verbose mode (matching: test_free_reference)
FAIL: test_free_reference (test.test_concurrent_futures.test_thread_pool.ThreadPoolExecutorTest.test_free_reference)