闭包里的生命周期

struct Person {
    name: String,
    age: u8,
}
fn main() {
    let p = Person {
        name: "Hao Chen".to_string(),
        age: 44,
    };
    //可以运行，因为 `u8` 有 Copy Trait
    let age = |p: &Person| p.age;
    // String 没有Copy Trait，所以，这里所有权就 Move 走了
    let name: for<'a> fn(&'a Person) -> &'a String = |p: &Person| &p.name;
    //下面的声明可以正确译
    // let name: for<'a> fn(&'a Person) -> &'a String = |p: &Person| &p.name;
    println!("name={}, age={}", name(&p), age(&p));
}