update CI scripts

Author: ssrlive

.github/workflows/rust.yml

@@ -17,8 +17,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: rust version
-      run: rustc --version
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        components: clippy, rustfmt
     - name: rustfmt
       run: cargo fmt --all -- --check
     - name: check

src/acl/mod.rs

@@ -510,7 +510,7 @@ impl AccessControl {
 
     /// Returns the ASCII representation a domain name,
     /// if conversion fails returns original string
-    fn convert_to_ascii(host: &str) -> Cow<str> {
+    fn convert_to_ascii(host: &str) -> Cow<'_, str> {
         idna::domain_to_ascii(host).map(From::from).unwrap_or_else(|_| host.into())
     }