Is this a bug ?

I am poor at the Engligh writting. Because an explanation sentence can't be described well, I want it to think that the following one for the difference is seen. --- xemacs-21.2.19/src/syntax.c Fri Jun 25 15:01:08 1999 +++ xemacs-21.2.19/src/syntax.c.new Fri Aug 20 15:25:21 1999 ＠＠ -424,7 +424,7 ＠＠ #endif from--; #ifdef MULE - ch1 = BUF_FETCH_CHAR (buf, from - 1); + ch1 = BUF_FETCH_CHAR (buf, from /* - 1 */); code = SYNTAX_UNSAFE (mirrortab, ch1); if (words_include_escapes && (code == Sescape || code == Scharquote))