proc main()
{
    var a = [1,2,3].enclose();
    var b = a.disclose();
    b[1] = 20;
    print("'a: ', V", a);
    print("'b: ', 3(V,X)", b);
    var c = @@a;
    b[1] = 200;
    print("'b: ', 3(V,X)", b);
    print("'c: ', V", c);
}