*                  types of the invoked method).
     */
    public void genArgs(List<JCExpression> trees, List<Type> pts) {
        for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) {
            genExpr(l.head, pts.head).load();
            pts = pts.tail;
        }
        // require lists be of same length
        assert pts.isEmpty();
    }