call site 3 for path.local.readlink
path/local/testing/test_posix.py - line 46
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   def test_symlink_relative(self):
       tmpdir = self.tmpdir 
       linkpath = tmpdir.join('test')
       filepath = tmpdir.join('file')
       filepath.write("Hello")
       linkpath.mksymlinkto(filepath, absolute=False)
->     assert linkpath.readlink() == "file"
       assert filepath.read() == linkpath.read()