Make cargo check --all --examples work!

packages/native-core/examples/simple.rs

@@ -218,5 +218,5 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 // wait 1 second
                 tokio::time::sleep(std::time::Duration::from_secs(1)).await;
             }
-        }
+        })
 }