TAND
if ((t = readtoken()) == TAND) {
case TAND:
RETURN(TAND);
if (vtable[TAND].v_access&CHANGED) {
vtable[TAND].v_access &= ~CHANGED;
if (boolean(value(TAND)))
setboolean(value(TAND), 1);
setboolean(value(TAND), 0);
if (boolean(value(TAND)))