error[E0277]: the trait bound `T: MyDisplay` is not satisfied
  --> $DIR/issue-65774-1.rs:10:5
   |
LL |     type MpuConfig: MyDisplay = T;
   |     ^^^^^^^^^^^^^^^^---------^^^^^
   |     |               |
   |     |               required by this bound in `MPU::MpuConfig`
   |     the trait `MyDisplay` is not implemented for `T`

error[E0277]: the trait bound `T: MyDisplay` is not satisfied
  --> $DIR/issue-65774-1.rs:44:76
   |
LL |         let closure = |config: &mut <S as MPU>::MpuConfig| writer.my_write(&config);
   |                                                                            ^^^^^^^ the trait `MyDisplay` is not implemented for `T`
   |
note: required because of the requirements on the impl of `MyDisplay` for `&mut T`
  --> $DIR/issue-65774-1.rs:5:24
   |
LL | impl<'a, T: MyDisplay> MyDisplay for &'a mut T { }
   |                        ^^^^^^^^^     ^^^^^^^^^
   = note: required for the cast to the object type `dyn MyDisplay`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.