void main() {
    int start = 0;
    int[] a = new int[4];
    int[] b = a;
    int[] c = b;
    test(a == c);
    
    test(length(a));
    test(length(b));
    test(length(c));
    
    a[0] = 50;
    a[1] = 60;
    a[2] = 70;
    a[3] = 80;
    
    test(a[0]);
    test(a[1]);
    test(a[2]);
    test(a[3]); 
}