error[E0308]: mismatched types --> $DIR/issue-57741-1.rs:14:9 | LL | let y = match x { | - this expression has type `Box` LL | S::A { a } | S::B { b: a } => a, | ^^^^^^^^^^ expected struct `Box`, found enum `S` | = note: expected struct `Box` found enum `S` error[E0308]: mismatched types --> $DIR/issue-57741-1.rs:14:22 | LL | let y = match x { | - this expression has type `Box` LL | S::A { a } | S::B { b: a } => a, | ^^^^^^^^^^^^^ expected struct `Box`, found enum `S` | = note: expected struct `Box` found enum `S` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.