call site 5 for execnet.Channel.receive
execnet/testing/test_gateway.py - line 180
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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) 
execnet/channel.py - line 184
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   def next(self): 
       try:
->         return self.receive()
       except EOFError: 
           raise StopIteration