error[E0004]: non-exhaustive patterns: `A::B { x: Some(_) }` not covered --> $DIR/struct-like-enum-nonexhaustive.rs:8:11 | LL | match x { | ^ pattern `A::B { x: Some(_) }` not covered | note: `A` defined here --> $DIR/struct-like-enum-nonexhaustive.rs:2:5 | LL | enum A { | - LL | B { x: Option }, | ^ not covered = note: the matched value is of type `A` help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown | LL ~ A::B { x: None } => {}, LL + A::B { x: Some(_) } => todo!() | error: aborting due to previous error For more information about this error, try `rustc --explain E0004`.