error[E0277]: the trait bound `for<'a> &'a _: Trait` is not satisfied
  --> $DIR/issue-89333.rs:6:5
   |
LL |     test(&|| 0);
   |     ^^^^ the trait `for<'a> Trait` is not implemented for `&'a _`
   |
help: this trait has no implementations, consider adding one
  --> $DIR/issue-89333.rs:9:1
   |
LL | trait Trait {}
   | ^^^^^^^^^^^
note: required by a bound in `test`
  --> $DIR/issue-89333.rs:11:55
   |
LL | fn test<T>(arg: &impl Fn() -> T) where for<'a> &'a T: Trait {}
   |                                                       ^^^^^ required by this bound in `test`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.