fn myfunc(a: i32, b: i32)-> Option<i32> {
    Some(a + b)
}

fn lift_opt2<A, B, R, F: Fn(A, B) -> Option<R>>(f: F) -> impl Fn(Option<A>, Option<B>) -> Option<R> {
    move |a: Option<A>, b: Option<B>| a.and_then(|a| b.and_then(|b| f(a, b)))
}

fn main() {
    let a = Some(2);
    let b = Some(3);
    let result = lift_opt2(myfunc)(a, b);

    println!("{:?}", result);
}