error[E0621]: explicit lifetime required in the type of `x`
  --> $DIR/ex1-return-one-existing-name-if-else-using-impl-2.rs:14:15
   |
13 | fn foo<'a>(x: &i32, y: &'a i32) -> &'a i32 {
   |            - consider changing the type of `x` to `&'a i32`
14 |    if x > y { x } else { y }
   |               ^ lifetime `'a` required

error: aborting due to previous error(s)