call site 0 for execnet.Channel.__del__
test/rsession/testing/test_hostmanage.py - line 63
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   def test_remote_has_homedir_as_currentdir(self):
       host = self._gethostinfo()
       old = py.path.local.get_temproot().chdir()
       try:
->         host.initgateway()
           channel = host.gw.remote_exec(py.code.Source(
               gethomedir, """
                   import os
                   homedir = gethomedir()
                   curdir = os.getcwd()
                   channel.send((curdir, homedir))
               """))
           remote_curdir, remote_homedir = channel.receive()
           assert remote_curdir == remote_homedir 
       finally:
           old.chdir()