refactor(ast_codegen): no longer outputs discard variable for empty v…

…isitors.

crates/oxc_ast/src/generated/visit.rs

@@ -1574,7 +1574,6 @@ pub mod walk {
 
     pub fn walk_template_element<'a, V: Visit<'a>>(visitor: &mut V, it: &TemplateElement<'a>) {
         // NOTE: AstKind doesn't exists!
-        let _ = (visitor, it);
     }
 
     pub fn walk_expressions<'a, V: Visit<'a>>(visitor: &mut V, it: &Vec<'a, Expression<'a>>) {
@@ -2480,7 +2479,6 @@ pub mod walk {
 
     pub fn walk_js_doc_unknown_type<'a, V: Visit<'a>>(visitor: &mut V, it: &JSDocUnknownType) {
         // NOTE: AstKind doesn't exists!
-        let _ = (visitor, it);
     }
 
     pub fn walk_decorators<'a, V: Visit<'a>>(visitor: &mut V, it: &Vec<'a, Decorator<'a>>) {
@@ -3217,7 +3215,6 @@ pub mod walk {
 
     pub fn walk_jsx_empty_expression<'a, V: Visit<'a>>(visitor: &mut V, it: &JSXEmptyExpression) {
         // NOTE: AstKind doesn't exists!
-        let _ = (visitor, it);
     }
 
     pub fn walk_jsx_fragment<'a, V: Visit<'a>>(visitor: &mut V, it: &JSXFragment<'a>) {

crates/oxc_ast/src/generated/visit_mut.rs

@@ -1585,7 +1585,6 @@ pub mod walk_mut {
         it: &mut TemplateElement<'a>,
     ) {
         // NOTE: AstType doesn't exists!
-        let _ = (visitor, it);
     }
 
     pub fn walk_expressions<'a, V: VisitMut<'a>>(
@@ -2584,7 +2583,6 @@ pub mod walk_mut {
         it: &mut JSDocUnknownType,
     ) {
         // NOTE: AstType doesn't exists!
-        let _ = (visitor, it);
     }
 
     pub fn walk_decorators<'a, V: VisitMut<'a>>(visitor: &mut V, it: &mut Vec<'a, Decorator<'a>>) {
@@ -3378,7 +3376,6 @@ pub mod walk_mut {
         it: &mut JSXEmptyExpression,
     ) {
         // NOTE: AstType doesn't exists!
-        let _ = (visitor, it);
     }
 
     pub fn walk_jsx_fragment<'a, V: VisitMut<'a>>(visitor: &mut V, it: &mut JSXFragment<'a>) {

tasks/ast_codegen/src/generators/visit.rs

@@ -583,16 +583,13 @@ impl<'a> VisitBuilder<'a> {
             .collect();
 
         let body = if KIND_BLACK_LIST.contains(&ident.to_string().as_str()) {
-            let unused =
-                if fields_visits.is_empty() { Some(quote!(let _ = (visitor, it);)) } else { None };
             let note = insert!(
                 "// NOTE: {} doesn't exists!",
                 if self.is_mut { "AstType" } else { "AstKind" }
             );
             quote! {
                 #note
                 #(#fields_visits)*
-                #unused
             }
         } else {
             let kind = self.kind_type(ident);