This gist shows, why the lifetime specifier helps the rust compiler to see a hidden borrow.

lifetime.rs

enum Quality {
    Good,
    Questionable,
    Invalid,
}
// TODO: Implement as trait
struct HasQuality<'a> {
    pub value: &'a Box<&'a str>,
    quality: Quality,
}

impl<'a> HasQuality<'a> {
    pub fn new(value: &'a Box<&'a str>, quality: Quality) -> Self {
        Self {
            value,
            quality,
        }
    }
}
impl<'a> Drop for HasQuality<'a> {
    fn drop(&mut self) { }
}

#[test]
fn it_works() {
    let message = Box::new("Hello World!");
    let information = HasQuality::new(&message, Quality::Good);
    assert_eq!(*information.value, Box::new("Hello World!"));
    drop(message);
    assert_eq!(*information.value, Box::new("Hello World!"));
    drop(information);
    assert_eq!(*information.value, Box::new("Hello World!"));
}

/// OUTPUT:
/// ```
/// error[E0505]: cannot move out of `message` because it is borrowed
///   --> src/lib.rs:29:10
///    |
/// 27 |     let information = HasQuality::new(&message, Quality::Good);
///    |                                       -------- borrow of `message` occurs here
/// 28 |     assert_eq!(*information.value, Box::new("Hello World!"));
/// 29 |     drop(message);
///    |          ^^^^^^^ move out of `message` occurs here
/// 30 |     assert_eq!(*information.value, Box::new("Hello World!"));
///    |     --------------------------------------------------------- borrow later used here
/// 
/// ```