error[E0038]: the trait `Array` cannot be made into an object
  --> $DIR/issue-20692.rs:7:5
   |
LL | trait Array: Sized + Copy {}
   |       -----  -----   ---- ...because it requires `Self: Sized`
   |       |      |
   |       |      ...because it requires `Self: Sized`
   |       this trait cannot be made into an object...
...
LL |     &dyn Array;
   |     ^^^^^^^^^^ the trait `Array` cannot be made into an object

error[E0038]: the trait `Array` cannot be made into an object
  --> $DIR/issue-20692.rs:4:13
   |
LL | trait Array: Sized + Copy {}
   |       -----  -----   ---- ...because it requires `Self: Sized`
   |       |      |
   |       |      ...because it requires `Self: Sized`
   |       this trait cannot be made into an object...
...
LL |     let _ = x
   |             ^ the trait `Array` cannot be made into an object
   |
   = note: required because of the requirements on the impl of `CoerceUnsized<&dyn Array>` for `&T`
   = note: required by cast to type `&dyn Array`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0038`.