warning: not reporting region error due to nll
  --> $DIR/region-object-lifetime-4.rs:22:7
   |
LL |     x.borrowed() //~ ERROR cannot infer
   |       ^^^^^^^^

error: unsatisfied lifetime constraints
  --> $DIR/region-object-lifetime-4.rs:22:5
   |
LL | fn borrowed_receiver_related_lifetimes2<'a,'b>(x: &'a (Foo+'b)) -> &'b () {
   |                                         -- -- lifetime `'b` defined here
   |                                         |
   |                                         lifetime `'a` defined here
LL |     x.borrowed() //~ ERROR cannot infer
   |     ^^^^^^^^^^^^ argument requires that `'a` must outlive `'b`

error: aborting due to previous error