error[E0446]: private type `Bar` in public interface
  --> $DIR/E0446.rs:10:5
   |
LL | struct Bar;
   | ---------- `Bar` declared as private
...
LL |     type Alias1 = Bar;
   |     ^^^^^^^^^^^ can't leak private type

error[E0446]: private trait `PrivTr` in public interface
  --> $DIR/E0446.rs:11:5
   |
LL | trait PrivTr {}
   | ------------ `PrivTr` declared as private
...
LL |     type Alias2 = Box<dyn PrivTr>;
   |     ^^^^^^^^^^^ can't leak private trait

error: aborting due to 2 previous errors

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