Rollup merge of #129675 - lolbinarycat:bufreader_peek_unsized, r=workingjubilee

allow BufReader::peek to be called on unsized types

#128405

library/std/src/io/buffered/bufreader.rs

@@ -94,7 +94,9 @@ pub fn new(inner: R) -> BufReader<R> {
     pub fn with_capacity(capacity: usize, inner: R) -> BufReader<R> {
         BufReader { inner, buf: Buffer::with_capacity(capacity) }
     }
+}
 
+impl<R: Read + ?Sized> BufReader<R> {
     /// Attempt to look ahead `n` bytes.
     ///
     /// `n` must be less than `capacity`.