error[E0308]: mismatched types
  --> $DIR/higher-ranked-upcasting-ok.rs:17:5
   |
LL |     x
   |     ^ one type is more general than the other
   |
   = note: expected existential trait ref `for<'a, 'b> Supertrait<'a, 'b>`
              found existential trait ref `for<'a> Supertrait<'a, 'a>`

error[E0308]: mismatched types
  --> $DIR/higher-ranked-upcasting-ok.rs:17:5
   |
LL |     x
   |     ^ one type is more general than the other
   |
   = note: expected existential trait ref `for<'a, 'b> Supertrait<'a, 'b>`
              found existential trait ref `for<'a> Supertrait<'a, 'a>`
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 2 previous errors

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