LBRK
if (*pe == LBRK) {
case LBRK:
%token LBRK
map : LBRK RUNE RUNE RBRK
| map LBRK RUNE RUNE RBRK
| LBRK RUNE THRU RUNE ':' RUNE RBRK
| map LBRK RUNE THRU RUNE ':' RUNE RBRK