From 61ef802c98bb25a7c1052ddf46fa2ef08f3a4122 Mon Sep 17 00:00:00 2001
From: bitcp <7768468+bitcp@users.noreply.github.com>
Date: Tue, 3 Feb 2026 13:51:39 +0800
Subject: [PATCH] Remove an extra "mut"

---
 content/tokio/tutorial/async.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/content/tokio/tutorial/async.md b/content/tokio/tutorial/async.md
index 57216bab..afae7bb3 100644
--- a/content/tokio/tutorial/async.md
+++ b/content/tokio/tutorial/async.md
@@ -142,7 +142,7 @@ enum MainFuture {
 impl Future for MainFuture {
     type Output = ();
 
-    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>)
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>)
         -> Poll<()>
     {
         use MainFuture::*;