msvc fix

Author: Drevoed

src/io/buf_writer.rs

@@ -192,7 +192,7 @@ impl<W: AsyncWrite + Unpin> BufWriter<W> {
         self.inner
     }
 
-    pub fn poll_into_inner(mut self: Pin<&mut Self>, cx: Context<'_>) -> Poll<io::Result<usize>> {
+    pub fn poll_into_inner(self: Pin<&mut Self>, _cx: Context<'_>) -> Poll<io::Result<usize>> {
         unimplemented!("poll into inner method")
     }
 
@@ -218,7 +218,7 @@ impl<W: AsyncWrite + Unpin> BufWriter<W> {
     }
 
 
-    pub fn poll_flush_buf(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+    pub fn poll_flush_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
         let Self {
             inner,
             buf,
@@ -374,7 +374,7 @@ impl<W: AsyncWrite + Unpin> AsyncWrite for LineWriter<W> {
             return Poll::Ready(Ok(n));
         }
         match ready!(self.inner().poll_write(cx, &buf[i + 1..])) {
-            Ok(i) => Poll::Ready(Ok(n + 1)),
+            Ok(_) => Poll::Ready(Ok(n + 1)),
             Err(_) => Poll::Ready(Ok(n)),
         }
     }