Update to new io_slice_advance interface

.github/workflows/ci.yml

@@ -52,6 +52,8 @@ jobs:
       - run: cargo install cross
       - run: cross test --target ${{ matrix.target }} --workspace --all-features
       - run: cross test --target ${{ matrix.target }} --workspace --all-features --release
+        # TODO: https://github.com/rust-lang/futures-rs/issues/2451
+        if: matrix.target != 'aarch64-unknown-linux-gnu'
 
   core-msrv:
     name: cargo +${{ matrix.rust }} build (futures-{core, io, sink, task})
@@ -254,12 +256,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Install Rust and Clippy
-        run: |
-          toolchain=nightly-$(curl -sSf https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/clippy)
-          rustup set profile minimal
-          rustup default "$toolchain"
-          rustup component add clippy
+      - name: Install Rust
+        run: rustup toolchain install nightly --component clippy && rustup default nightly
       - run: cargo clippy --workspace --all-features --all-targets
 
   fmt:

futures-util/src/io/write_all_vectored.rs

@@ -4,7 +4,6 @@ use futures_core::task::{Context, Poll};
 use futures_io::AsyncWrite;
 use futures_io::IoSlice;
 use std::io;
-use std::mem;
 use std::pin::Pin;
 
 /// Future for the
@@ -19,8 +18,9 @@ pub struct WriteAllVectored<'a, W: ?Sized + Unpin> {
 impl<W: ?Sized + Unpin> Unpin for WriteAllVectored<'_, W> {}
 
 impl<'a, W: AsyncWrite + ?Sized + Unpin> WriteAllVectored<'a, W> {
-    pub(super) fn new(writer: &'a mut W, bufs: &'a mut [IoSlice<'a>]) -> Self {
-        Self { writer, bufs: IoSlice::advance(bufs, 0) }
+    pub(super) fn new(writer: &'a mut W, mut bufs: &'a mut [IoSlice<'a>]) -> Self {
+        IoSlice::advance_slices(&mut bufs, 0);
+        Self { writer, bufs }
     }
 }
 
@@ -34,7 +34,7 @@ impl<W: AsyncWrite + ?Sized + Unpin> Future for WriteAllVectored<'_, W> {
             if n == 0 {
                 return Poll::Ready(Err(io::ErrorKind::WriteZero.into()));
             } else {
-                this.bufs = IoSlice::advance(mem::take(&mut this.bufs), n);
+                IoSlice::advance_slices(&mut this.bufs, n);
             }
         }