From a5d8e46ef19fa20258e5234319dfca7343f032fc Mon Sep 17 00:00:00 2001
From: luojiyin <luojiyin@hotmail.com>
Date: Tue, 2 Sep 2025 11:45:36 +0800
Subject: [PATCH] feat: demo code clear

---
 tutorial/04_borrowing.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tutorial/04_borrowing.md b/tutorial/04_borrowing.md
index 8d91f00..c4c968e 100644
--- a/tutorial/04_borrowing.md
+++ b/tutorial/04_borrowing.md
@@ -44,6 +44,7 @@ fn main() {
     let r3 = &mut s;
     r3.push_str(", world");
     println!("{}", r3);
+    println!("s is {}",s); //会发现 s 的值变了
 }
 ```