#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let x: Option<u32> = Some(2);
    assert_eq!(x.is_some_and(| x | x > 1), true);
    let x: Option<u32> = Some(0);
    assert_eq!(x.is_some_and(| x | x > 1), false);
    let x: Option<u32> = None;
    assert_eq!(x.is_some_and(| x | x > 1), false);
    let x: Option<String> = Some("ownership".to_string());
    assert_eq!(x.as_ref().is_some_and(| x | x.len() > 1), true);
    println!("still alive {:?}", x);
}