is_known_utf8 check taken from into_string

Borgerr · Borgerr · commit da8e157afd7c · 2024-06-23T22:34:33.000-06:00
diff --git a/library/std/src/sys_common/wtf8.rs b/library/std/src/sys_common/wtf8.rs
@@ -480,6 +480,7 @@ impl 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();
     }
 }
 

Original file line number	Diff line number	Diff line change
`@@ -480,6 +480,7 @@ impl Wtf8Buf {`
`480`	`480`	`#[inline]`
`481`	`481`	`pub(crate) fn extend_from_slice(&mut self, other: &[u8]) {`
`482`	`482`	`self.bytes.extend_from_slice(other);`
	`483`	`+ self.is_known_utf8 = self.is_known_utf8 \|\| self.next_surrogate(0).is_none();`
`483`	`484`	`}`
`484`	`485`	`}`
`485`	`486`