call site 14 for execnet.Channel.send
execnet/testing/test_gateway.py - line 122
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   def test_remote_exec_channel_anonymous(self):
       channel = self.gw.remote_exec('''
                       obj = channel.receive()
                       channel.send(obj)
                     ''')
->     channel.send(42)
       result = channel.receive()
       assert result == 42