Rewrite Rhai function dispatching

examples/reuse_scope.rs

@@ -5,10 +5,14 @@ fn main() {
     let mut engine = Engine::new();
     let mut scope: Scope = Vec::new();
 
-    if !engine.eval_with_scope::<()>(&mut scope, "let x = 4 + 5").is_ok() { assert!(false); }
+    if !engine
+        .eval_with_scope::<()>(&mut scope, "let x = 4 + 5")
+        .is_ok()
+    {
+        assert!(false);
+    }
 
     if let Ok(result) = engine.eval_with_scope::<i64>(&mut scope, "x") {
-       println!("result: {}", result);
+        println!("result: {}", result);
     }
 }
-