error: lifetime may not live long enough
  --> $DIR/ex1-return-one-existing-name-return-type-is-anon.rs:8:5
   |
LL |   fn foo<'a>(&self, x: &'a i32) -> &i32 {
   |          --  - let's call the lifetime of this reference `'1`
   |          |
   |          lifetime `'a` defined here
LL |
LL |     x
   |     ^ method was supposed to return data with lifetime `'1` but it is returning data with lifetime `'a`

error: aborting due to previous error