error: unused variable: `y` --> $DIR/lint-match-arms.rs:5:9 | LL | y => (), | ^ help: if this is intentional, prefix it with an underscore: `_y` | note: the lint level is defined here --> $DIR/lint-match-arms.rs:3:16 | LL | #[deny(unused_variables)] | ^^^^^^^^^^^^^^^^ error: aborting due to 1 previous error