call site 4 for execnet.PopenGateway.remote_exec
execnet/testing/test_gateway.py - line 198
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   def test_channel_passing_over_channel(self):
       channel = self.gw.remote_exec('''
                       c = channel.gateway.newchannel()
                       channel.send(c)
                       c.send(42)
                     ''')
       c = channel.receive()
       x = c.receive()
       assert x == 42
   
       # check that the both sides previous channels are really gone
       channel.waitclose(TESTTIMEOUT)
       #assert c.id not in self.gw._channelfactory
       newchan = self.gw.remote_exec('''
                       assert %d not in channel.gateway._channelfactory._channels
->                   ''' % (channel.id))
       newchan.waitclose(TESTTIMEOUT)
       assert channel.id not in self.gw._channelfactory._channels