call site 1 for execnet.Channel.__del__
test/rsession/testing/test_hostmanage.py - line 209
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   def test_hostmanager_init_rsync_topdir_explicit(self):
       dir2 = self.source.ensure("dir1", "dir2", dir=1)
       dir2.ensure("hello")
       hm = self.gethostmanager(
           dist_hosts = ["localhost:%s" % self.dest],
           dist_rsync_roots = [str(self.source)]
       )
       assert hm.config.topdir == self.source
->     hm.init_rsync([].append)
       dest = self.dest.join(self.source.basename)
       assert dest.join("dir1").check()
       assert dest.join("dir1", "dir2").check()
       assert dest.join("dir1", "dir2", 'hello').check()