refactor(traverse): remove unnecessary #[allow] (#8518)

Pure refactor. Remove unnecessary `#[allow]` attrs. Replace remaining ones with `#[expect]`.

crates/oxc_traverse/scripts/lib/ancestor.mjs

@@ -112,9 +112,7 @@ export default function generateAncestorsCode(types) {
   }
 
   return `
-    #![allow(
-      unsafe_code,
-      clippy::missing_safety_doc,
+    #![expect(
       clippy::ptr_as_ptr,
       clippy::undocumented_unsafe_blocks,
       clippy::cast_ptr_alignment,
@@ -131,7 +129,6 @@ export default function generateAncestorsCode(types) {
     /// Used in [\`crate::TraverseCtx::retag_stack\`].
     #[repr(u16)]
     #[derive(Clone, Copy)]
-    #[allow(dead_code)]
     pub(crate) enum AncestorType {
       None = 0,
       ${ancestorTypeEnumVariants}

crates/oxc_traverse/scripts/lib/traverse.mjs

@@ -24,7 +24,7 @@ export default function generateTraverseTraitCode(types) {
 
     use crate::TraverseCtx;
 
-    #[allow(unused_variables)]
+    #[expect(unused_variables)]
     pub trait Traverse<'a> {
       ${traverseMethods}
     }

crates/oxc_traverse/scripts/lib/walk.mjs

@@ -22,15 +22,10 @@ export default function generateWalkFunctionsCode(types) {
   }
 
   return `
-    #![allow(
-      unsafe_code,
-      clippy::missing_safety_doc,
-      clippy::missing_panics_doc,
-      clippy::undocumented_unsafe_blocks,
+    #![expect(
       clippy::semicolon_if_nothing_returned,
       clippy::ptr_as_ptr,
       clippy::ref_as_ptr,
-      clippy::borrow_as_ptr,
       clippy::cast_ptr_alignment
     )]
 

crates/oxc_traverse/src/context/ancestry.rs

@@ -160,7 +160,7 @@ impl<'a> TraverseAncestry<'a> {
     /// # SAFETY
     /// This method must not be public outside this crate, or consumer could break safety invariants.
     #[inline]
-    #[allow(unused_variables, clippy::needless_pass_by_value)]
+    #[expect(unused_variables, clippy::needless_pass_by_value)]
     pub(crate) fn pop_stack(&mut self, token: PopToken) {
         // SAFETY: `PopToken`s are only created in `push_stack`, so the fact that caller provides one
         // guarantees that a push has happened. This method consumes the token which guarantees another
@@ -191,7 +191,7 @@ impl<'a> TraverseAncestry<'a> {
     ///
     /// This method must not be public outside this crate, or consumer could break safety invariants.
     #[inline]
-    #[allow(unsafe_code, clippy::ptr_as_ptr, clippy::ref_as_ptr)]
+    #[expect(clippy::ptr_as_ptr, clippy::ref_as_ptr)]
     pub(crate) unsafe fn retag_stack(&mut self, ty: AncestorType) {
         debug_assert!(self.stack.len() >= 2);
         *(self.stack.last_mut() as *mut _ as *mut AncestorType) = ty;

crates/oxc_traverse/src/context/scoping.rs

@@ -286,7 +286,7 @@ impl TraverseScoping {
     ///   what was found in AST.
     /// i.e. if source contains identifiers `_foo` and `__bar`, create UIDs names `___0`, `___1`,
     /// `___2` etc. They'll all be unique within the program.
-    #[allow(clippy::missing_panics_doc)]
+    #[expect(clippy::missing_panics_doc)]
     pub fn generate_uid_name(&mut self, name: &str) -> CompactStr {
         // If `uid_names` is not already populated, initialize it
         if self.uid_names.is_none() {

crates/oxc_traverse/src/generated/ancestor.rs

@@ -2,9 +2,7 @@
 // Generated by `oxc_traverse/scripts/build.mjs`.
 // To alter this generated file you have to edit the codegen.
 
-#![allow(
-    unsafe_code,
-    clippy::missing_safety_doc,
+#![expect(
     clippy::ptr_as_ptr,
     clippy::undocumented_unsafe_blocks,
     clippy::cast_ptr_alignment,
@@ -21,7 +19,6 @@ use oxc_syntax::scope::ScopeId;
 /// Used in [`crate::TraverseCtx::retag_stack`].
 #[repr(u16)]
 #[derive(Clone, Copy)]
-#[allow(dead_code)]
 pub(crate) enum AncestorType {
     None = 0,
     ProgramHashbang = 1,

crates/oxc_traverse/src/generated/traverse.rs

@@ -7,7 +7,7 @@ use oxc_ast::ast::*;
 
 use crate::TraverseCtx;
 
-#[allow(unused_variables)]
+#[expect(unused_variables)]
 pub trait Traverse<'a> {
     #[inline]
     fn enter_program(&mut self, node: &mut Program<'a>, ctx: &mut TraverseCtx<'a>) {}

crates/oxc_traverse/src/generated/walk.rs

@@ -2,15 +2,10 @@
 // Generated by `oxc_traverse/scripts/build.mjs`.
 // To alter this generated file you have to edit the codegen.
 
-#![allow(
-    unsafe_code,
-    clippy::missing_safety_doc,
-    clippy::missing_panics_doc,
-    clippy::undocumented_unsafe_blocks,
+#![expect(
     clippy::semicolon_if_nothing_returned,
     clippy::ptr_as_ptr,
     clippy::ref_as_ptr,
-    clippy::borrow_as_ptr,
     clippy::cast_ptr_alignment
 )]