call site 8 for execnet.Channel.receive
execnet/testing/test_gateway.py - line 326
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   def test_channel_file(self): 
       channel = self.gw.remote_exec("""
               f = channel.makefile() 
               print >>f, "hello world" 
               f.close() 
               channel.send(42) 
           """)
->     first = channel.receive() + channel.receive()
       assert first.strip() == 'hello world' 
       second = channel.receive() 
       assert second == 42