call site 3 for magic.revert
magic/testing/test_patch.py - line 12
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   def test_patch_revert():
       class a:
           pass
       raises(AttributeError, "patch(a, 'i', 42)")
   
       a.i = 42
       patch(a, 'i', 23)
       assert a.i == 23
->     revert(a, 'i')
       assert a.i == 42