OP_BACKREFN      1687 ext/mbstring/oniguruma/regcomp.c 	    r = add_opcode(reg, OP_BACKREFN);
OP_BACKREFN      5718 ext/mbstring/oniguruma/regcomp.c   { OP_BACKREFN,            "backrefn",             ARG_MEMNUM  },
OP_BACKREFN      2137 ext/mbstring/oniguruma/regexec.c     case OP_BACKREFN:  MOP_IN(OP_BACKREFN);