fun iter_ (vec: vec_int) (current: int): void = do
    if current == @len(vec) then
        do end
    else
        do
            -- iter logic
            -- TODO: function as argument
            @get(vec, current) |> @write(_)
            @write("\n")

            iter_(vec, current + 1)
        end
    end
end

fun iter (vec: vec_int): void = do
    iter_(vec, 0)
end

fun main: void = do
    let foo: vec_int = [69, 420, 727, 1337, 42069, 69420]
    iter(foo)
end