anchor.diff:          _ ->
               throw({error, {missing_option_arg, Name}})
       end.
  -    
  +
   
   %% @doc Find the option for the discrete argument in position specified in the
   %%      Pos argument.
  
positive.code:     (Arg =:= "on") orelse (Arg =:= "enabled") orelse
      (Arg =:= "1").
  
      
  -spec is_arg_false(string()) -> boolean().
  is_arg_false(Arg) ->
      (Arg =:= "false") orelse (Arg =:= "f") orelse
  
negative.code:     lists:flatten(lists:reverse(usage_options_reverse(OptSpecList, []))).
  
  usage_options_reverse([{Name, Short, Long, _ArgSpec, Help} | Tail], Acc) ->
      Prefix =
          case Long of
              undefined ->
                  case Short of
                      % Neither short nor long form (non-option argument).
  