chore(cargo): add unexpected cfgs to [lints] table (#3678)

Author: Urgau

.github/workflows/CI.yml

@@ -23,7 +23,6 @@ jobs:
       - features
       - ffi
       - ffi-header
-      - unexpected-cfgs
       - doc
       - check-external-types
       - udeps
@@ -221,22 +220,6 @@ jobs:
       - name: Ensure that hyper.h is up to date
         run: ./capi/gen_header.sh --verify
 
-  unexpected-cfgs:
-    runs-on: ubuntu-latest
-    needs: [style]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@nightly
-      - uses: Swatinem/rust-cache@v2
-      - run: cargo check --all-features
-        env:
-          RUSTFLAGS: >-
-            -D unexpected_cfgs
-            --cfg hyper_internal_check_unexpected_cfgs
-            --cfg hyper_unstable_tracing
-            --cfg hyper_unstable_ffi
-            --check-cfg=cfg(hyper_internal_check_unexpected_cfgs,hyper_unstable_tracing,hyper_unstable_ffi)
-
   doc:
     name: Build docs
     needs: [style, test]

Cargo.toml

@@ -93,9 +93,16 @@ tracing = ["dep:tracing"]
 # internal features used in CI
 nightly = []
 
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = [
+    'cfg(hyper_unstable_tracing)',
+    'cfg(hyper_unstable_ffi)'
+]
+
 [package.metadata.docs.rs]
 features = ["ffi", "full", "tracing"]
-rustdoc-args = ["--cfg", "docsrs", "--cfg", "hyper_unstable_ffi", "--cfg", "hyper_unstable_tracing"]
+rustdoc-args = ["--cfg", "hyper_unstable_ffi", "--cfg", "hyper_unstable_tracing"]
 
 [package.metadata.playground]
 features = ["full"]

src/lib.rs

@@ -1,6 +1,5 @@
 #![deny(missing_docs)]
 #![deny(missing_debug_implementations)]
-#![cfg_attr(not(hyper_internal_check_unexpected_cfgs), allow(unexpected_cfgs))]
 #![cfg_attr(test, deny(rust_2018_idioms))]
 #![cfg_attr(all(test, feature = "full"), deny(unreachable_pub))]
 #![cfg_attr(all(test, feature = "full"), deny(warnings))]