call site 15 for execnet.PopenGateway.remote_exec
execnet/testing/test_gateway.py - line 179
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   def test_channel_iter(self):
       channel = self.gw.remote_exec("""
                 for x in range(3): 
                   channel.send(x)
->         """) 
       l = list(channel) 
       assert l == range(3)