Update nightly CI version

.cirrus.yml

@@ -4,7 +4,7 @@ freebsd_instance:
   image_family: freebsd-14-0
 env:
   RUST_STABLE: stable
-  RUST_NIGHTLY: nightly-2023-10-21
+  RUST_NIGHTLY: nightly-2024-05-05
   RUSTFLAGS: -D warnings
 
 # Test FreeBSD in a full VM on cirrus-ci.com.  Test the i686 target too, in the

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ env:
   RUST_BACKTRACE: 1
   # Change to specific Rust release to pin
   rust_stable: stable
-  rust_nightly: nightly-2023-10-21
+  rust_nightly: nightly-2024-05-05
   rust_clippy: '1.77'
   # When updating this, also update:
   # - README.md
@@ -995,6 +995,21 @@ jobs:
         run: cargo check-external-types --all-features
         working-directory: tokio
 
+  check-unexpected-lints-cfgs:
+    name: check unexpected lints and cfgs
+    needs: basics
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust ${{ env.rust_nightly }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.rust_nightly }}
+      - name: check tokio
+        run: cargo check --all-features
+        env:
+          RUSTFLAGS: -Dwarnings --check-cfg=cfg(loom) --check-cfg=cfg(tokio_unstable) -Funexpected_cfgs -Funknown_lints
+
   check-fuzzing:
     name: check-fuzzing
     needs: basics