call site 0 for execnet.PopenGateway.newchannel
execnet/testing/test_gateway.py - line 106
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   def test_remote_exec_waitclose_2(self):
->     channel = self.gw.remote_exec('def gccycle(): pass')
       channel.waitclose(TESTTIMEOUT)
execnet/gateway.py - line 219
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   def remote_exec(self, source, stdout=None, stderr=None): 
       """ return channel object and connect it to a remote
               execution thread where the given 'source' executes
               and has the sister 'channel' object in its global 
               namespace.  The callback functions 'stdout' and 
               'stderr' get called on receival of remote 
               stdout/stderr output strings. 
           """
       try:
           source = str(Source(source))
       except NameError: 
           try: 
               import py 
               source = str(py.code.Source(source))
           except ImportError: 
               pass 
->     channel = self.newchannel() 
       outid = self._newredirectchannelid(stdout) 
       errid = self._newredirectchannelid(stderr) 
       self._outgoing.put(Message.CHANNEL_OPEN(channel.id, 
                              (source, outid, errid)))
       return channel