From e5167fe7bd52a8eaebbf01d0b1469785306f4a96 Mon Sep 17 00:00:00 2001
From: ash <97464181+Borgerr@users.noreply.github.com>
Date: Tue, 25 Jun 2024 23:58:43 -0600
Subject: [PATCH] set self.is_known_utf8 to false in extend_from_slice

---
 library/std/src/sys_common/wtf8.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/std/src/sys_common/wtf8.rs b/library/std/src/sys_common/wtf8.rs
index 708f62f476e..117a3e23044 100644
--- a/library/std/src/sys_common/wtf8.rs
+++ b/library/std/src/sys_common/wtf8.rs
@@ -480,7 +480,7 @@ pub fn from_box(boxed: Box<Wtf8>) -> Wtf8Buf {
     #[inline]
     pub(crate) fn extend_from_slice(&mut self, other: &[u8]) {
         self.bytes.extend_from_slice(other);
-        self.is_known_utf8 = self.is_known_utf8 || self.next_surrogate(0).is_none();
+        self.is_known_utf8 = false;
     }
 }