fn sign(value: i32) -> i32 {
    if value < 0 {
        return -1
    } else if value > 0 {
        return 1
    }
    return 0
}

pub fn main(world: World) -> Void raises {
    if sign(-4) == -1 && sign(7) == 1 {
        check world.out.write("conditional structures ok\n")
    }
}