fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
    if x.len() > y.len() {
        x
    } else {
        y
    }
}

fn call_after() {
    // lifetime 'a
    let s1 = "asdas".to_string();

    // lifetime 'a (like return type of longest func)
    let reference;
    {
        // lifetime 'b
        let s2 = "hello wrlld".to_string();
        // cant turn 'b into 'a here
        reference = s2.as_str();
    }
    //                           'a     'b ('b doesnt exist anymore)
    let result = longest(&s1, &reference);
    //                               cant do that
    println!("result: {}", result);
}

fn main() {
    call_after()
}