diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3e0e2bd48..36d4f0e73 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -317,11 +317,12 @@ jobs:
         run: rustup update stable
       - run: cargo fmt --all -- --check
 
-  docs:
-    name: cargo doc
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install Rust
-        run: rustup update nightly && rustup default nightly
-      - run: RUSTDOCFLAGS="-D warnings --cfg docsrs" cargo doc --workspace --no-deps --all-features
+  # TODO: upstream bug https://github.com/rust-lang/rust/issues/118670
+  # docs:
+  #   name: cargo doc
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #     - name: Install Rust
+  #       run: rustup update nightly && rustup default nightly
+  #     - run: RUSTDOCFLAGS="-D warnings --cfg docsrs" cargo doc --workspace --no-deps --all-features
diff --git a/futures-test/src/lib.rs b/futures-test/src/lib.rs
index 49f834846..91f5273f8 100644
--- a/futures-test/src/lib.rs
+++ b/futures-test/src/lib.rs
@@ -14,6 +14,7 @@
         allow(dead_code, unused_assignments, unused_variables)
     )
 ))]
+#![allow(clippy::test_attr_in_doctest)]
 
 #[cfg(not(feature = "std"))]
 compile_error!(
diff --git a/futures-util/src/io/chain.rs b/futures-util/src/io/chain.rs
index 728a3d2dc..410ff0dc7 100644
--- a/futures-util/src/io/chain.rs
+++ b/futures-util/src/io/chain.rs
@@ -121,9 +121,7 @@ where
 
         if !*this.done_first {
             match ready!(this.first.poll_fill_buf(cx)?) {
-                buf if buf.is_empty() => {
-                    *this.done_first = true;
-                }
+                [] => *this.done_first = true,
                 buf => return Poll::Ready(Ok(buf)),
             }
         }
diff --git a/futures-util/src/stream/futures_ordered.rs b/futures-util/src/stream/futures_ordered.rs
index 3aaef8bde..2cc144e81 100644
--- a/futures-util/src/stream/futures_ordered.rs
+++ b/futures-util/src/stream/futures_ordered.rs
@@ -19,7 +19,8 @@ pin_project! {
     struct OrderWrapper<T> {
         #[pin]
         data: T, // A future or a future's output
-        index: isize,
+        // Use i64 for index since isize may overflow in 32-bit targets.
+        index: i64,
     }
 }
 
@@ -98,8 +99,8 @@ where
 pub struct FuturesOrdered<T: Future> {
     in_progress_queue: FuturesUnordered<OrderWrapper<T>>,
     queued_outputs: BinaryHeap<OrderWrapper<T::Output>>,
-    next_incoming_index: isize,
-    next_outgoing_index: isize,
+    next_incoming_index: i64,
+    next_outgoing_index: i64,
 }
 
 impl<T: Future> Unpin for FuturesOrdered<T> {}