error[E0412]: cannot find type `Missing` in this scope
  --> $DIR/rpitit-shadowed-by-missing-adt.rs:8:35
   |
LL |     fn w() -> impl Deref<Target = Missing<impl Sized>>;
   |                                   ^^^^^^^ not found in this scope

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0412`.