call site 6 for execnet.PopenGateway.remote_exec
execnet/testing/test_gateway.py - line 131
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   def test_channel_finish_and_then_EOFError(self):
->     channel = self.gw.remote_exec('channel.send(42)') 
       x = channel.receive()
       assert x == 42
       py.test.raises(EOFError, channel.receive) 
       py.test.raises(EOFError, channel.receive) 
       py.test.raises(EOFError, channel.receive)