// EXIT:42
unit optional;

fn pick(flag: bool) -> ?i32 {
    if flag { return 42; }
    return null;
}

fn main() -> i32 {
    let a: ?i32 = pick(true);
    let b: ?i32 = pick(false);
    let x: i32 = a orelse 0;
    let y: i32 = b orelse 0;
    return x + y;
}