t / t8005 / euc-japan.txton commit parse-options: detect attempt to add a duplicate short option name (af465af)
   1EUC_JAPAN_NAME="»³ÅÄ ÂÀϺ"
   2EUC_JAPAN_MSG="¥Ö¥ì¡¼¥à¤Î¥Æ¥¹¥È¤Ç¤¹¡£"