push(new PrefixDecrementNode(toLocation(op), pop()));
break;
case PLUSPLUS:
op = jj_consume_token(PLUSPLUS);
UnaryExpression();
push(new PrefixIncrementNode(toLocation(op), pop()));
break;
case COPYOF:
jj_consume_token(COPYOF);
UnaryExpression();
push(new CopyNode(pop()));