1 error: `?Trait` is not permitted in trait object types
2 --> $DIR/only-maybe-bound.rs:3:15
4 LL | type _0 = dyn ?Sized;
7 error[E0224]: at least one trait is required for an object type
8 --> $DIR/only-maybe-bound.rs:3:11
10 LL | type _0 = dyn ?Sized;
13 error: aborting due to 2 previous errors
15 For more information about this error, try `rustc --explain E0224`.