call site 4 for path.local.mksymlinkto
path/local/testing/test_posix.py - line 86
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   def test_realpath_file(self):
       tmpdir = self.tmpdir 
       linkpath = tmpdir.join('test')
       filepath = tmpdir.join('file')
       filepath.write("")
->     linkpath.mksymlinkto(filepath)
       realpath = linkpath.realpath()
       assert realpath.basename == 'file'