io: remove poll_{read,write}_buf from traits (#2882)

These functions have object safety issues. It also has been decided to
avoid vectored operations on the I/O traits. A later PR will bring back
vectored operations on specific types that support them.

Refs: #2879, #2716

1 files changed, 0 insertions, 9 deletions

diff --git a/tokio/src/net/tcp/split.rs b/tokio/src/net/tcp/split.rs
index 9d99d7bd..6e927f05 100644
--- a/tokio/src/net/tcp/split.rs
+++ b/tokio/src/net/tcp/split.rs
@@ -12,7 +12,6 @@ use crate::future::poll_fn;
 use crate::io::{AsyncRead, AsyncWrite, ReadBuf};
 use crate::net::TcpStream;
 
-use bytes::Buf;
 use std::io;
 use std::net::Shutdown;
 use std::pin::Pin;
@@ -148,14 +147,6 @@ impl AsyncWrite for WriteHalf<'_> {
         self.0.poll_write_priv(cx, buf)
     }
 
-    fn poll_write_buf<B: Buf>(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        self.0.poll_write_buf_priv(cx, buf)
-    }
-
     #[inline]
     fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
         // tcp flush is a no-op