allow BufReader::peek to be called on unsized types

rust-lang · Aug 28, 2024 · fc28478 · fc28478
1 parent 600edc9
commit fc28478
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/library/std/src/io/buffered/bufreader.rs b/library/std/src/io/buffered/bufreader.rs
@@ -117,7 +117,10 @@ impl<R: Read> BufReader<R> {
     /// assert_eq!(&s, "hello");
     /// ```
     #[unstable(feature = "bufreader_peek", issue = "128405")]
-    pub fn peek(&mut self, n: usize) -> io::Result<&[u8]> {
+    pub fn peek(&mut self, n: usize) -> io::Result<&[u8]>
+    where
+        R: ?Sized,
+    {
         assert!(n <= self.capacity());
         while n > self.buf.buffer().len() {
             if self.buf.pos() > 0 {