error: unsatisfied lifetime constraints
  --> $DIR/region-object-lifetime-2.rs:20:5
   |
LL | fn borrowed_receiver_different_lifetimes<'a,'b>(x: &'a Foo) -> &'b () {
   |                                          -- -- lifetime `'b` defined here
   |                                          |
   |                                          lifetime `'a` defined here
LL |     x.borrowed() //~ ERROR cannot infer
   |     ^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'b`

error: aborting due to previous error