anchor.diff:  
   start_symb_char($#) -> false;
   start_symb_char($`) -> false;
  -start_symb_char($') -> false;            %'
  +start_symb_char($') -> false;                   %'
   start_symb_char($,) -> false;
  -start_symb_char($|) -> false;            %Symbol quote character
  +start_symb_char($|) -> false;                   %Symbol quote character
   start_symb_char(C) -> symb_char(C).
   
   symb_char($() -> false;
  
positive.code: 
  fwrite1(F, As) ->
      case catch lfe_io_format:fwrite1(F, As) of
      {'EXIT',_} ->                %Something went wrong
          erlang:error(badarg, [F,As]);    %Signal from here
      Result -> Result
      end.
  
negative.code: symb_char($]) -> false;
  symb_char(${) -> false;
  symb_char($}) -> false;
  symb_char($") -> false;
  symb_char($;) -> false;
  symb_char(C) -> ((C > $\s) and (C =< $~)) orelse (C > $\240).
  
  