error[E0782]: trait objects must include the `dyn` keyword
  --> $DIR/generic-with-implicit-hrtb-without-dyn.rs:6:24
   |
LL | fn ice() -> impl AsRef<Fn(&())> {
   |                        ^^^^^^^
   |
help: add `dyn` keyword before this trait
   |
LL - fn ice() -> impl AsRef<Fn(&())> {
LL + fn ice() -> impl AsRef<dyn Fn(&())> {
   |

error[E0277]: the trait bound `(): AsRef<(dyn for<'r> Fn(&'r ()) + 'static)>` is not satisfied
  --> $DIR/generic-with-implicit-hrtb-without-dyn.rs:6:13
   |
LL | fn ice() -> impl AsRef<Fn(&())> {
   |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'r> Fn(&'r ()) + 'static)>` is not implemented for `()`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0782.
For more information about an error, try `rustc --explain E0277`.