error[E0446]: private type `fn(u8) -> u8 {my_const_fn}` in public interface
  --> $DIR/eval-privacy.rs:16:5
   |
LL |     type AssocTy = Const<{ my_const_fn(U) }>;
   |     ^^^^^^^^^^^^ can't leak private type
...
LL | const fn my_const_fn(val: u8) -> u8 {
   | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0446`.