anchor.diff:  GET /unexpected-disallow
   < 200
   < Content-Type: application/json
  -{ \"ok\": true, \"{{_}}\": \"{{unexpected}}\" }
  +{
  +    \"ok\": true,
  +    \"extra_object\": {
  +        \"{{_}}\": \"{{unexpected}}\"
  +    },
  +    \"extra_array\": [\"{{unexpected}}\"]
  +}
   "/utf8>>).
   
   %%%_* Emacs ============================================================
  
positive.code:                    ) ->
    {ok, {{200, []}, [{"Content-Type", "application/json"}], <<"{
      \"ok\": true,
      \"extra_value\": \"test\"
  }
  "/utf8>>}}.
  
  
negative.code:                  , _
                   , _
                   , [ {_, _, _, _, {fail, [ { unexpected
                                             , {"/body/extra_object/key", _, _}
                                             },
                                             { unexpected
                                             , {"/body/extra_array/0", _, _}
                                             }
                                           ]}}
                     ]
  