call site 0 for execnet.Channel.makefile
execnet/testing/test_gateway.py - line 333
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   def test_channel_file_write_error(self): 
       channel = self.gw.remote_exec("pass") 
->     f = channel.makefile() 
       channel.waitclose(TESTTIMEOUT)
       py.test.raises(IOError, f.write, 'hello')