error: implementation of `Debug` is not general enough
  --> $DIR/higher-ranked-auto-trait-9.rs:43:50
   |
LL |     let fut: &(dyn Future<Output = ()> + Send) = &fut as _;
   |                                                  ^^^^^^^^^ implementation of `Debug` is not general enough
   |
   = note: `(dyn Any + '0)` must implement `Debug`, for any lifetime `'0`...
   = note: ...but `Debug` is actually implemented for the type `(dyn Any + 'static)`

error: aborting due to 1 previous error