Use #[expect(lint)] over #[allow(lint)] where possible (#17822)

crates/ruff_db/src/diagnostic/render.rs

@@ -376,7 +376,7 @@ struct Renderable<'r> {
     // (At time of writing, 2025-03-13, we currently render the diagnostic
     // ID into the main message of the parent diagnostic. We don't use this
     // specific field to do that though.)
-    #[allow(dead_code)]
+    #[expect(dead_code)]
     id: &'r str,
     diagnostics: Vec<RenderableDiagnostic<'r>>,
 }

crates/ruff_db/src/system/os.rs

@@ -50,7 +50,6 @@ impl OsSystem {
 
         Self {
             // Spreading `..Default` because it isn't possible to feature gate the initializer of a single field.
-            #[allow(clippy::needless_update)]
             inner: Arc::new(OsSystemInner {
                 cwd: cwd.to_path_buf(),
                 case_sensitivity,

crates/ruff_db/src/system/walk_directory.rs

@@ -35,7 +35,7 @@ impl WalkDirectoryBuilder {
     /// Each additional path is traversed recursively.
     /// This should be preferred over building multiple
     /// walkers since it enables reusing resources.
-    #[allow(clippy::should_implement_trait)]
+    #[expect(clippy::should_implement_trait)]
     pub fn add(mut self, path: impl AsRef<SystemPath>) -> Self {
         self.paths.push(path.as_ref().to_path_buf());
         self

crates/ruff_db/src/vendored.rs

@@ -172,7 +172,7 @@ impl Default for VendoredFileSystem {
 /// that users of the `VendoredFileSystem` could realistically need.
 /// For debugging purposes, however, we want to have all information
 /// available.
-#[allow(unused)]
+#[expect(unused)]
 #[derive(Debug)]
 struct ZipFileDebugInfo {
     crc32_hash: u32,