call site 1 for execnet.PopenGateway.remote_exec
execnet/testing/test_gateway.py - line 139
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   def test_channel_close_and_then_receive_error_multiple(self):
->     channel = self.gw.remote_exec('channel.send(42) ; raise ValueError')
       x = channel.receive()
       assert x == 42
       py.test.raises(channel.RemoteError, channel.receive)