anchor.diff:                      {ok, OK2, NoOK2}
               end;
           {missing, Key} ->
  -            {error, {missing_mandatory_field, Key}}
  +            {error, {missing_mandatory_field, nklib_util:to_binary(Key)}}
       end;
   
   parse_config([{Key, Val}|Rest], OK, NoOK, Syntax, Opts) ->
  
positive.code:     {error, Error}
      when Error :: 
          {syntax_error, binary()} | 
          {invalid_spec, syntax_opt()} |
          term().
  
  
negative.code:     {error, Error}
      when Error :: 
          {syntax_error, binary()} | 
          {missing_mandatory_field, binary()} |
          {invalid_spec, syntax_opt()} |
          term().
  
  