error: returning the result of a let binding from a block. Consider returning the expression directly.
  --> $DIR/matches.rs:9:13
   |
LL |             x
   |             ^
   |
   = note: `-D clippy::let-and-return` implied by `-D warnings`
note: this expression can be directly returned
  --> $DIR/matches.rs:8:21
   |
LL |             let x = 3;
   |                     ^

error: aborting due to previous error