call site 6 for execnet.RSync.send
execnet/testing/test_rsync.py - line 94
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   def test_rsync_non_verbose(self):
       source = self.source
       source.ensure("hello")
       cap = py.io.StdCapture()
       try:
           rsync = RSync(source, verbose=False)
           rsync.add_target(gw, self.dest1)
->         rsync.send()
       finally:
           out, err = cap.reset()
       assert not out
       assert not err