diff --git a/crates/red_knot/src/ast_ids.rs b/crates/red_knot/src/ast_ids.rs
index e456c8c95af862..a73a62beef5937 100644
--- a/crates/red_knot/src/ast_ids.rs
+++ b/crates/red_knot/src/ast_ids.rs
@@ -275,7 +275,7 @@ pub struct TypedNodeKey<N: AstNode> {
 
 impl<N: AstNode> TypedNodeKey<N> {
     pub fn new(node_key: NodeKey) -> Option<Self> {
-        N::can_cast(node_key.kind).then(|| TypedNodeKey {
+        N::can_cast(node_key.kind).then_some(TypedNodeKey {
             inner: node_key,
             _marker: PhantomData,
         })
diff --git a/crates/red_knot/src/db.rs b/crates/red_knot/src/db.rs
index 616d3966a47a22..eede7c884dc655 100644
--- a/crates/red_knot/src/db.rs
+++ b/crates/red_knot/src/db.rs
@@ -309,5 +309,5 @@ pub fn definitions(db: &dyn Db, source_text: SourceText) -> Arc<Definitions> {
     let ast = parsed.ast(db);
     let ids = ast_ids(db, source_text);
 
-    Arc::new(Definitions::from_module(ast, &*ids, source_text.file(db)))
+    Arc::new(Definitions::from_module(ast, &ids, source_text.file(db)))
 }
diff --git a/crates/red_knot/src/hir/definition.rs b/crates/red_knot/src/hir/definition.rs
index 83321ce725f2a5..35b239796ab98f 100644
--- a/crates/red_knot/src/hir/definition.rs
+++ b/crates/red_knot/src/hir/definition.rs
@@ -417,34 +417,28 @@ impl DefinitionsVisitor<'_> {
     fn lower_type_parameter(&mut self, type_parameter: &TypeParam) -> TypeParameterId {
         match type_parameter {
             TypeParam::TypeVar(type_var) => {
-                let id = self
-                    .definitions
+                self.definitions
                     .type_parameters
                     .push(TypeParameter::TypeVar(TypeParameterTypeVar {
                         name: Name::new(&type_var.name),
                         ast_id: self.ast_id(type_var),
-                    }));
-                id
+                    }))
             }
             TypeParam::ParamSpec(param_spec) => {
-                let id = self
-                    .definitions
+                self.definitions
                     .type_parameters
                     .push(TypeParameter::ParamSpec(TypeParameterParamSpec {
                         name: Name::new(&param_spec.name),
                         ast_id: self.ast_id(param_spec),
-                    }));
-                id
+                    }))
             }
             TypeParam::TypeVarTuple(type_var_tuple) => {
-                let id = self
-                    .definitions
+                self.definitions
                     .type_parameters
                     .push(TypeParameter::TypeVarTuple(TypeParameterTypeVarTuple {
                         name: Name::new(&type_var_tuple.name),
                         ast_id: self.ast_id(type_var_tuple),
-                    }));
-                id
+                    }))
             }
         }
     }
@@ -546,17 +540,17 @@ impl PreorderVisitor<'_> for DefinitionsVisitor<'_> {
     fn visit_except_handler(&mut self, except_handler: &'_ ExceptHandler) {
         match except_handler {
             ExceptHandler::ExceptHandler(except_handler) => {
-                self.lower_except_handler(except_handler)
+                self.lower_except_handler(except_handler);
             }
         }
     }
 
     fn visit_with_item(&mut self, with_item: &'_ WithItem) {
-        self.lower_with_item(&with_item);
+        self.lower_with_item(with_item);
     }
 
     fn visit_match_case(&mut self, match_case: &'_ MatchCase) {
-        self.lower_match_case(&match_case);
+        self.lower_match_case(match_case);
         self.visit_body(&match_case.body);
     }
 }
diff --git a/crates/red_knot/src/module.rs b/crates/red_knot/src/module.rs
index dc805c85d4b822..8dc5805f702c48 100644
--- a/crates/red_knot/src/module.rs
+++ b/crates/red_knot/src/module.rs
@@ -53,7 +53,7 @@ impl ModuleName {
         Some(Self(name))
     }
 
-    pub fn components(&self) -> impl Iterator<Item = &str> + DoubleEndedIterator {
+    pub fn components(&self) -> impl DoubleEndedIterator<Item = &str> {
         self.0.split('.')
     }
 
@@ -208,7 +208,7 @@ impl ModuleResolver {
 
     /// Returns the module for a given id.
     pub fn module(&self, id: ModuleId) -> &Module {
-        self.modules.get(&id).unwrap()
+        &self.modules[&id]
     }
 
     /// Updates the last modified time for the module corresponding to `path`.
@@ -257,7 +257,7 @@ impl ModuleResolver {
         if module.path().root() == &root_path {
             let normalized = path.canonicalize().ok()?;
 
-            if !module.path().resolved().starts_with(&normalized) {
+            if !module.path().resolved().starts_with(normalized) {
                 // This path is for a module with the same name but with a different precedence. For example:
                 // ```
                 // src/foo.py
@@ -507,8 +507,8 @@ mod tests {
         let baz = bar.join("baz.py");
 
         std::fs::create_dir_all(&bar)?;
-        std::fs::write(&foo.join("__init__.py"), "")?;
-        std::fs::write(&bar.join("__init__.py"), "")?;
+        std::fs::write(foo.join("__init__.py"), "")?;
+        std::fs::write(bar.join("__init__.py"), "")?;
         std::fs::write(&baz, "print('Hello, world!')")?;
 
         let baz_id = test_case.resolver.resolve(ModuleName::new("foo.bar.baz"));
@@ -535,7 +535,7 @@ mod tests {
         let baz = bar.join("baz.py");
 
         std::fs::create_dir_all(&bar)?;
-        std::fs::write(&foo.join("__init__.py"), "")?;
+        std::fs::write(foo.join("__init__.py"), "")?;
         std::fs::write(&baz, "print('Hello, world!')")?;
 
         let baz_id = test_case.resolver.resolve(ModuleName::new("foo.bar.baz"));
diff --git a/crates/ruff_python_ast/src/node.rs b/crates/ruff_python_ast/src/node.rs
index 0dd2bf036b16d7..ac193bfe7a73dc 100644
--- a/crates/ruff_python_ast/src/node.rs
+++ b/crates/ruff_python_ast/src/node.rs
@@ -17,7 +17,7 @@ pub trait AstNode: Ranged {
     fn cast(kind: AnyNode) -> Option<Self>
     where
         Self: Sized;
-    fn cast_ref<'a>(kind: AnyNodeRef<'a>) -> Option<Self::Ref<'a>>;
+    fn cast_ref(kind: AnyNodeRef<'_>) -> Option<Self::Ref<'_>>;
 
     fn can_cast(kind: NodeKind) -> bool;