error: lifetime may not live long enough
  --> $DIR/ex3-both-anon-regions-self-is-anon.rs:7:19
   |
LL |     fn foo<'a>(&self, x: &Foo) -> &Foo {
   |                -         - let's call the lifetime of this reference `'1`
   |                |
   |                let's call the lifetime of this reference `'2`
LL |         if true { x } else { self }
   |                   ^ associated function was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`
   |
help: consider introducing a named lifetime parameter and update trait if needed
   |
LL |     fn foo<'a>(&'a self, x: &'a Foo) -> &Foo {
   |                 ++           ++

error: aborting due to previous error