fn maybeValue(bytes: Span<u8>, index: usize) -> Maybe<u8> raises {
    check std.mem.get(bytes, index)
    return std.mem.get(bytes, index)
}

fn privateFail(flag: Bool) -> i32 raises {
    if flag {
        raise Hidden
    }
    return 7
}

fn namedFail(flag: Bool) -> i32 raises [Hidden] {
    let value: i32 = check privateFail(flag)
    return value
}

pub fn main(world: World) -> Void raises {
    let bytes: [1]u8 = [42]
    let found: u8 = check maybeValue(bytes, 0)
    let fallback: u8 = rescue maybeValue(bytes, 3) err 5_u8
    let recovered: i32 = rescue namedFail(true) err 9
    if found == 42_u8 && fallback == 5_u8 && recovered == 9 {
        check world.out.write("maybe error flow ok\n")
    }
}