error[E0700]: hidden type for `impl Sized + 'a` captures lifetime that does not appear in bounds
  --> $DIR/early_bound.rs:7:17
   |
LL | fn test<'a: 'a>(n: bool) -> impl Sized + 'a {
   |         --                  --------------- opaque type defined here
   |         |
   |         hidden type `&'a ()` captures the lifetime `'a` as defined here
...
LL |         let _ = identity::<&'a ()>(test(false));
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: concrete type differs from previous defining opaque type use
  --> $DIR/early_bound.rs:3:29
   |
LL | fn test<'a: 'a>(n: bool) -> impl Sized + 'a {
   |                             ^^^^^^^^^^^^^^^ expected `&()`, got `()`
   |
note: previous use here
  --> $DIR/early_bound.rs:7:36
   |
LL |         let _ = identity::<&'a ()>(test(false));
   |                                    ^^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0700`.