call site 4 for execnet.Channel.waitclose
execnet/testing/test_gateway.py - line 212
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   def test_channel_receiver_callback(self): 
       l = []
       #channel = self.gw.newchannel(receiver=l.append)
       channel = self.gw.remote_exec(source='''
               channel.send(42)
               channel.send(13)
               channel.send(channel.gateway.newchannel())
               ''') 
       channel.setcallback(callback=l.append)
       py.test.raises(IOError, channel.receive)
->     channel.waitclose(TESTTIMEOUT)
       assert len(l) == 3
       assert l[:2] == [42,13]
       assert isinstance(l[2], channel.__class__)