error: unused variable: `a` --> $DIR/issue-22599.rs:8:19 | LL | v = match 0 { a => 0 }; | ^ help: if this is intentional, prefix it with an underscore: `_a` | note: the lint level is defined here --> $DIR/issue-22599.rs:1:9 | LL | #![deny(unused_variables)] | ^^^^^^^^^^^^^^^^ error: aborting due to 1 previous error