borrow_checker.rs

fn get_longest(v: &[String]) -> &str {
    assert!(v.len() > 0);
    let mut result = &v[0];
    for s in v {
        if s.len() > result.len() {
            result = &s
        }
    }
    result.as_str()
}

fn foo(v: &mut Vec<String>) {
    let longest = get_longest(v);
    if longest != "longest" {
        let longest = format!("{} (longest)", longest.len());
        v.push(longest);
    }
}

fn main() {
    
}