error[E0495]: cannot infer an appropriate lifetime for autoref due to conflicting requirements
  --> $DIR/region-object-lifetime-4.rs:22:7
   |
LL |     x.borrowed() //~ ERROR cannot infer
   |       ^^^^^^^^
   |
note: first, the lifetime cannot outlive the lifetime 'a as defined on the function body at 21:41...
  --> $DIR/region-object-lifetime-4.rs:21:41
   |
LL | fn borrowed_receiver_related_lifetimes2<'a,'b>(x: &'a (Foo+'b)) -> &'b () {
   |                                         ^^
note: ...so that reference does not outlive borrowed content
  --> $DIR/region-object-lifetime-4.rs:22:5
   |
LL |     x.borrowed() //~ ERROR cannot infer
   |     ^
note: but, the lifetime must be valid for the lifetime 'b as defined on the function body at 21:44...
  --> $DIR/region-object-lifetime-4.rs:21:44
   |
LL | fn borrowed_receiver_related_lifetimes2<'a,'b>(x: &'a (Foo+'b)) -> &'b () {
   |                                            ^^
note: ...so that reference does not outlive borrowed content
  --> $DIR/region-object-lifetime-4.rs:22:5
   |
LL |     x.borrowed() //~ ERROR cannot infer
   |     ^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0495`.