call site 1 for _thread.WorkerPool.dispatch
thread/testing/test_pool.py - line 63
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   def test_maxthreads():
       pool = WorkerPool(maxthreads=1)
       def f():
           py.std.time.sleep(0.5)
       try:
           pool.dispatch(f)
->         py.test.raises(IOError, pool.dispatch, f)
       finally:
           pool.shutdown()
test/raises.py - line 30
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   def raises(ExpectedException, *args, **kwargs):
       """ raise AssertionError, if target code does not raise the expected
           exception.
       """
       assert args
       __tracebackhide__ = True 
       if isinstance(args[0], str):
           expr, = args
           assert isinstance(expr, str)
           frame = sys._getframe(1)
           loc = frame.f_locals.copy()
           loc.update(kwargs)
           #print "raises frame scope: %r" % frame.f_locals
           source = py.code.Source(expr)
           try:
               exec source.compile() in frame.f_globals, loc
               #del __traceback__
               # XXX didn'T mean f_globals == f_locals something special?
               #     this is destroyed here ...
           except ExpectedException:
               return py.code.ExceptionInfo()
       else:
           func = args[0]
           assert callable
           try:
->             func(*args[1:], **kwargs)
               #del __traceback__
           except ExpectedException:
               return py.code.ExceptionInfo()
           k = ", ".join(["%s=%r" % x for x in kwargs.items()])
           if k:
               k = ', ' + k
           expr = '%s(%r%s)' %(func.__name__, args, k)
       raise ExceptionFailure(msg="DID NOT RAISE", 
                              expr=args, expected=ExpectedException)