Functions and control flow

fn main() -> Unit {
    var total: Int64 = 0;
    var i = 1;
    while i <= 5 {
        total = total + i;
        i = i + 1;
    }

    if total == 15 {
        print("sum verified");
    } else {
        print("unexpected sum");
    }
    print(total);
    print(factorial(5));

    let label = "outer";
    {
        let label = "inner";
        print(label);
    }
    print(label);
}

// Forward function references and recursion are supported.
fn factorial(n: Int64) -> Int64 {
    if n <= 1 {
        return 1;
    } else {
        return n * factorial(n - 1);
    }
}
// Expected output:
// sum verified
// 15
// 120
// inner
// outer