fn start_main() -> i64 {
    var numbers: list<i64> = [2, 4, 6];
    let copied: list<i64> = numbers;
    append(numbers, 8);
    append(numbers, 10);
    var index: i64 = 0;
    var total: i64 = 0;
    while (index < length(numbers)) {
        total = total + numbers[index];
        index = index + 1;
    }
    print(format_i64(total) + "\n");
    print(format_i64(length(copied)) + "\n");
    print(format_i64(copied[2]) + "\n");
    return 0;
}