io-async: fix warnings for latest nightly (1.75.0)

.github/workflows/clippy.yml

@@ -15,6 +15,6 @@ jobs:
         with:
           # embedded-hal-async needs nightly.
           # Use a pinned version to avoid spontaneous breakages (new clippy lints are added often)
-          toolchain: nightly-2023-07-03
+          toolchain: nightly-2023-10-14
           components: clippy
-      - run: cargo clippy --all-features -- --deny=warnings
+      - run: cargo clippy --all-features -- --deny=warnings

.github/workflows/rustdoc.yml

@@ -13,5 +13,5 @@ jobs:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: nightly-2023-07-03
-      - run: RUSTDOCFLAGS="--deny=warnings --cfg=docsrs" cargo doc --all-features
+          toolchain: nightly-2023-10-14
+      - run: RUSTDOCFLAGS="--deny=warnings --cfg=docsrs" cargo doc --all-features

embedded-hal-async/src/lib.rs

@@ -6,6 +6,8 @@
 // We don't immediately remove them to not immediately break older nightlies.
 // When all features are stable, we'll remove them.
 #![allow(stable_features)]
+#![allow(unknown_lints)]
+#![allow(async_fn_in_trait)]
 #![feature(async_fn_in_trait, impl_trait_projections)]
 
 pub mod delay;

embedded-io-async/src/lib.rs

@@ -7,6 +7,8 @@
 // We don't immediately remove them to not immediately break older nightlies.
 // When all features are stable, we'll remove them.
 #![allow(stable_features)]
+#![allow(unknown_lints)]
+#![allow(async_fn_in_trait)]
 #![feature(async_fn_in_trait, impl_trait_projections)]
 
 #[cfg(feature = "alloc")]