proc main!() {
    let mut total = 0

    for x in [1, 2, 3] {
        total += x
    }

    for x in [| 4, 5, 6 |] {
        total += x
    }

    for k:v in {| 7 => 8, 9 => 10 |} {
        total += k + v
    }

    for x in 11 : 12 : 13 : unit {
        total += x
    }

    exit total
}