Fix: Clone closure directly for tail calls

src/ast/vm.rs

@@ -511,7 +511,7 @@ impl VM {
                 let frame = self.frames.last().ok_or("No call frame for 'again'")?;
                 if let Some(closure) = &frame.closure {
                     Ok(Value::TailCallRequest(Box::new((
-                        Rc::new(closure.as_ref().clone()) as Rc<dyn Object>,
+                        closure.clone() as Rc<dyn Object>,
                         arg_vals,
                     ))))
                 } else {