error[E0308]: mismatched types
  --> $DIR/issue-86201.rs:6:29
   |
LL | type FunType = impl Fn<()>;
   |                ----------- the expected opaque type
LL |
LL | static STATIC_FN: FunType = some_fn;
   |                             ^^^^^^^ expected opaque type, found fn item
   |
   = note: expected opaque type `impl Fn<()>`
                  found fn item `fn() {some_fn}`

error: could not find defining uses
  --> $DIR/issue-86201.rs:4:16
   |
LL | type FunType = impl Fn<()>;
   |                ^^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.