fn start_main() -> i64 {
    var pending: bool = true;
    while pending {
        print("Number: ");
        let parsed: result<i64> = parse_i64(read_line());
        if (parsed::ok) {
            print(format_i64(parsed::value + 1) + "\n");
            pending = false;
        } else {
            print(parsed::error::code + "\n");
        }
    }
    return 0;
}