call site 10 for io.StdCaptureFD.__init__
execnet/testing/test_gateway.py - line 31
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   def test_stdouterrin_setnull():
->     cap = py.io.StdCaptureFD()
       from py.__.execnet.register import stdouterrin_setnull
       stdouterrin_setnull()
       import os
       os.write(1, "hello")
       if os.name == "nt":
           os.write(2, "world")
       os.read(0, 1)
       out, err = cap.reset()
       assert not out
       assert not err