1 files changed, 6 insertions, 8 deletions
diff --git a/library/std/src/io/util.rs b/library/std/src/io/util.rs
index c1300cd67..f076ee092 100644
--- a/library/std/src/io/util.rs
+++ b/library/std/src/io/util.rs
@@ -5,7 +5,7 @@ mod tests;
 
 use crate::fmt;
 use crate::io::{
-    self, BufRead, IoSlice, IoSliceMut, Read, ReadBuf, Seek, SeekFrom, SizeHint, Write,
+    self, BorrowedCursor, BufRead, IoSlice, IoSliceMut, Read, Seek, SeekFrom, SizeHint, Write,
 };
 
 /// A reader which is always at EOF.
@@ -47,7 +47,7 @@ impl Read for Empty {
     }
 
     #[inline]
-    fn read_buf(&mut self, _buf: &mut ReadBuf<'_>) -> io::Result<()> {
+    fn read_buf(&mut self, _cursor: BorrowedCursor<'_>) -> io::Result<()> {
         Ok(())
     }
 }
@@ -130,21 +130,19 @@ impl Read for Repeat {
         Ok(buf.len())
     }
 
-    fn read_buf(&mut self, buf: &mut ReadBuf<'_>) -> io::Result<()> {
+    fn read_buf(&mut self, mut buf: BorrowedCursor<'_>) -> io::Result<()> {
         // SAFETY: No uninit bytes are being written
-        for slot in unsafe { buf.unfilled_mut() } {
+        for slot in unsafe { buf.as_mut() } {
             slot.write(self.byte);
         }
 
-        let remaining = buf.remaining();
+        let remaining = buf.capacity();
 
         // SAFETY: the entire unfilled portion of buf has been initialized
         unsafe {
-            buf.assume_init(remaining);
+            buf.advance(remaining);
         }
 
-        buf.add_filled(remaining);
-
         Ok(())
     }