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

error: aborting due to previous error