#![allow(unused)]
fn main() {
    let slice = [
        Some(10),
        Some(40),
        None,
        Some(33),
        Some(20),
        None,
        Some(1),
        Some(2),
    ];
    let mut iter: Vec<&[Option<i32>]> = slice.split(|num| num.is_none()).collect();
    let iter: Vec<Vec<i32>> = iter
        .iter()
        .map(|x| x.iter().map(|y| y.unwrap()).collect())
        .collect();
    println!("{:?}", iter);
}