error[E0433]: failed to resolve: use of undeclared type `Self`
  --> $DIR/use-self-type.rs:7:16
   |
LL |         pub(in Self::f) struct Z;
   |                ^^^^ use of undeclared type `Self`

error[E0432]: unresolved import `Self`
  --> $DIR/use-self-type.rs:6:13
   |
LL |         use Self::f;
   |             ^^^^ use of undeclared type `Self`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0432, E0433.
For more information about an error, try `rustc --explain E0432`.