call site 10 for _thread.WorkerPool.dispatch
thread/testing/test_pool.py - line 46
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   def test_get_timeout():
       pool = WorkerPool()
       def f(): 
           py.std.time.sleep(0.2) 
           return 42
->     reply = pool.dispatch(f) 
       py.test.raises(IOError, "reply.get(timeout=0.01)")