error: lifetime may not live long enough
  --> $DIR/region-object-lifetime-2.rs:10:5
   |
LL | fn borrowed_receiver_different_lifetimes<'a,'b>(x: &'a dyn Foo) -> &'b () {
   |                                          -- -- lifetime `'b` defined here
   |                                          |
   |                                          lifetime `'a` defined here
LL |     x.borrowed()
   |     ^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'b`
   |
   = help: consider adding the following bound: `'a: 'b`

error: aborting due to previous error