error[E0308]: mismatched types
  --> $DIR/casts-differing-anon.rs:21:13
   |
LL | fn foo() -> Box<impl fmt::Debug+?Sized> {
   |                 ---------------------- the found opaque type
...
LL | fn bar() -> Box<impl fmt::Debug+?Sized> {
   |                 ---------------------- the expected opaque type
...
LL |     b_raw = f_raw as *mut _;
   |             ^^^^^ expected opaque type, found a different opaque type
   |
   = note: expected opaque type `impl Debug + ?Sized` (opaque type at <$DIR/casts-differing-anon.rs:7:17>)
              found opaque type `impl Debug + ?Sized` (opaque type at <$DIR/casts-differing-anon.rs:3:17>)
   = note: distinct uses of `impl Trait` result in different opaque types

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.