call site 4 for path.local.chmod
path/local/testing/test_posix.py - line 149
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   def test_chmod_simple_int(self):
       print "self.root is", self.root
       mode = self.root.mode()
       self.root.chmod(mode/2)
       try:
           assert self.root.mode() != mode
       finally:
->         self.root.chmod(mode)
           assert self.root.mode() == mode