mkbranch
mkbranch (scbol[i / 2], scset[i / 2]);
extern int mkbranch PROTO ((int, int));
scset[i] = mkbranch( scset[i], def_rule );
mkbranch( scbol[scon_stk[i]],
scbol[i] = mkbranch( scbol[i],
mkbranch( scset[scon_stk[i]],
mkbranch( scset[i],