error[E0792]: expected generic type parameter, found `&F`
  --> $DIR/issue-99073.rs:6:11
   |
LL | fn fix<F: Fn(G), G: Fn()>(f: F) -> impl Fn() {
   |        - this generic parameter must be used with a generic type parameter
LL |   move || f(fix(&f))
   |           ^^^^^^^^^^

error: concrete type differs from previous defining opaque type use
  --> $DIR/issue-99073.rs:6:13
   |
LL |   move || f(fix(&f))
   |             ^^^^^^^ expected `{closure@$DIR/issue-99073.rs:6:3: 6:10}`, got `G`
   |
note: previous use here
  --> $DIR/issue-99073.rs:5:36
   |
LL | fn fix<F: Fn(G), G: Fn()>(f: F) -> impl Fn() {
   |                                    ^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0792`.