error[E0597]: `x` does not live long enough
 --> src/main.rs:4:3
  |
2 | let y = {
  |     - borrow later stored here
3 |   let x = String::from("Hello");
4 |   &x
  |   ^^ borrowed value does not live long enough
5 | };
  | - `x` dropped here while still borrowed

For more information about this error, try `rustc --explain E0597`.