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;