error: returning the result of a let binding from a block. Consider returning the expression directly. --> $DIR/matches.rs:18:13 | 18 | x | ^ | = note: `-D clippy::let-and-return` implied by `-D warnings` note: this expression can be directly returned --> $DIR/matches.rs:17:21 | 17 | let x = 3; | ^ error: aborting due to previous error