error[E0621]: explicit lifetime required in the type of `s`
 --> tests/ui/short-lifetime.rs:9:48
  |
9 |     pub fn ref_cast<'a>(s: &String) -> &'a Self;
  |                                                ^ lifetime `'a` required
  |
help: add explicit lifetime `'a` to the type of `s`
  |
9 |     pub fn ref_cast<'a>(s: &'a String) -> &'a Self;
  |                             ++