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