error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
  --> $DIR/ordinary-bounds-unsuited.rs:20:62
   |
LL | fn upper_bounds<'a, 'b>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'a, 'b>
   |                                                              ^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0700`.