anchor.diff:      lists:flatten(io_lib:format(F, A)).
   
   
  -%% i(F) ->
  -%%     i(F, []).
  +i(F) ->
  +    i(F, []).
   
   i(F, A) ->
       FStr = f("[~s] " ++ F, [formated_timestamp()|A]),
  
positive.code:         {ok, BadIndex} ->
              ?FAIL({if_name2index, Name, Index, BadIndex});
          {error, enotsup = Reason_N2I1} ->
              ?SKIP({if_name2index, Reason_N2I1});
          {error, Reason_N2I2} ->
              ?FAIL({if_name2index, Name, Reason_N2I2})
  
negative.code:             {ok, N} when is_list(N) andalso (N =/= []) ->
                  N;
              {error, enotsup = Reason} ->
                  i("if_names not supported - skipping"),
                  ?SKIP({if_names, Reason});
              {error, Reason} ->
                  ?FAIL({if_names, Reason})
  