fixed if let guards documentation

Author: Kivooeo

src/expressions/match-expr.md

@@ -229,7 +229,7 @@ Before a guard (including an `if let` guard) is evaluated:
 
       ```
       In the above example, `v` is already bound in the outer pattern, and the guard attempts to move it --- this is not allowed. You can fix it by cloning or borrowing:
-      ```rust
+      ```rust,ignore
       Some(v) if let Some(_) = take(v.clone()) => "ok",
       ```
 > [!NOTE]