error[E0277]: the size for values of type `Device` cannot be known at compilation time
  --> $DIR/unsized-extern-derefmove.rs:14:9
   |
LL |     let d: Device = unsafe { *make_device() };
   |         ^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `Device`
   = note: all local variables must have a statically known size
help: consider borrowing here
   |
LL |     let d: &Device = unsafe { *make_device() };
   |            +

error: aborting due to 1 previous error

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