anchor.diff:  
       file:write(File, [iolist_to_binary(mochijson2:encode(prepare_to_write(Json3)))]),
       file:close(File),
  -    ok.
  +    case Errors of
  +        [] -> ok;
  +        _ -> error
  +    end.
   
   %%--------------------------------------------------------------------
   %% @doc
  
positive.code: -author("Michal Wrzeszcz").
  
  -annotation('function').
  -include_lib("annotations/include/types.hrl").
  
  -export([around_advice/4]).
  
negative.code:             case proplists:get_value(perf_configs, ConfExt, []) of
                  [] ->
                      Ext = proplists:get_value(perf_config, ConfExt, []),
                      Ans = exec_perf_config(M, F, Inputs, Ext, Repeats),
                      ?assertEqual(ok, Ans);
                  Exts ->
                      AnsSum = lists:foldl(
                          fun(Ext, Acc) ->
                              Ans = exec_perf_config(M, F, Inputs, Ext, Repeats),
                              case Acc of
                                  ok -> Ans;
                                  _ -> Acc
                              end
                          end, ok, Exts),
                      ?assertEqual(ok, AnsSum)
              end;
          _ ->
              Ext = proplists:get_value(ct_config, ConfExt, []),
  