anchor.diff:             ]
            }
          ).
  +
   -define( UNEXPECTED_OBJECT
          , {?MATCH_ANY, ?UNEXPECTED}
          ).
  
positive.code:            ]
           }
         ).
  -define( SIMPLE_OBJECT1
         , { array
           , [ {"0", {struct, [{"type", "unknown"}]}}
  
negative.code:                                               ]
                                              ))
                ).
  
  fail_when_expected_contained_by_actual_and_unexpected_test() ->
    ?assertMatch( [{unexpected, {"/2", undefined, ?OBJECT_3}}]
                , filter_errors(compare_as_set( [ {"0", ?OBJECT_1}
  