From 9169107c1cf15bc955bb15a06d83a1ebf011e9eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=AE=A1=E5=94=AF=E5=AE=87?= <guanweiyu.b@bytedance.com>
Date: Thu, 6 Apr 2023 11:48:16 +0800
Subject: [PATCH] Remove an unnecessary `mut` in `BufWriter::into_parts`.

`ptr::read` takes `*const T` so `&mut` is not necessary.
---
 library/std/src/io/buffered/bufwriter.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/std/src/io/buffered/bufwriter.rs b/library/std/src/io/buffered/bufwriter.rs
index 6acb937e784..14c455d4fa3 100644
--- a/library/std/src/io/buffered/bufwriter.rs
+++ b/library/std/src/io/buffered/bufwriter.rs
@@ -339,7 +339,7 @@ impl<W: Write> BufWriter<W> {
         let buf = if !self.panicked { Ok(buf) } else { Err(WriterPanicked { buf }) };
 
         // SAFETY: forget(self) prevents double dropping inner
-        let inner = unsafe { ptr::read(&mut self.inner) };
+        let inner = unsafe { ptr::read(&self.inner) };
         mem::forget(self);
 
         (inner, buf)