error[E0308]: mismatched types --> $DIR/issue-82446.rs:11:9 | LL | val | ^^^ expected struct `Box`, found reference | = note: expected struct `Box<(dyn MyTrait + 'static)>` found reference `&Box<(dyn MyTrait + 'static)>` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.