error: field `b` is never read --> $DIR/union-lint-dead-code.rs:8:5 | LL | union Foo { | --- field in this union LL | x: usize, LL | b: bool, | ^ | note: the lint level is defined here --> $DIR/union-lint-dead-code.rs:4:9 | LL | #![deny(dead_code)] | ^^^^^^^^^ error: aborting due to 1 previous error