src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/src/main.rs

fn main() {
    let reference_to_nothing = dangle();
}

// ANCHOR: here
fn dangle() -> &String { // dangle returns a reference to a String

    let s = String::from("hello"); // s is a new String

    &s // we return a reference to the String, s
} // Here, s goes out of scope, and is dropped. Its memory goes away.
  // Danger!
// ANCHOR_END: here