error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from `dyn` type
  --> $DIR/bound-lifetime-through-dyn-trait.rs:6:71
   |
LL | fn dyn_hoops<T: Sized>() -> dyn for<'a> Iterator<Item = impl Captures<'a>> {
   |                                                                       ^^
   |
note: lifetime declared here
  --> $DIR/bound-lifetime-through-dyn-trait.rs:6:37
   |
LL | fn dyn_hoops<T: Sized>() -> dyn for<'a> Iterator<Item = impl Captures<'a>> {
   |                                     ^^

error: item does not constrain `Opaque::{opaque#0}`
  --> $DIR/bound-lifetime-through-dyn-trait.rs:11:8
   |
LL | pub fn main() {
   |        ^^^^
   |
   = note: consider removing `#[define_opaque]` or adding an empty `#[define_opaque()]`
note: this opaque type is supposed to be constrained
  --> $DIR/bound-lifetime-through-dyn-trait.rs:13:19
   |
LL |     type Opaque = impl Sized;
   |                   ^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0657`.