call site 0 for _thread.ThreadOut.deinstall
thread/testing/test_io.py - line 65
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   def test_threadout_nested(self):
       # we want ThreadOuts to coexist
       last = sys.stdout
       out = ThreadOut(sys, 'stdout')
       assert last == sys.stdout
->     out.deinstall()
       assert last == sys.stdout