From 64946ac15c5e8ee957a48d05c536c8faf53d966c Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Thu, 5 Feb 2026 16:24:52 +0900
Subject: [PATCH] make it work on msrv

---
 actix-web-codegen/src/route.rs | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/actix-web-codegen/src/route.rs b/actix-web-codegen/src/route.rs
index 0bc803560..b56700f67 100644
--- a/actix-web-codegen/src/route.rs
+++ b/actix-web-codegen/src/route.rs
@@ -527,17 +527,27 @@ impl ToTokens for Route {
             quote! { #vis struct #name; }
         } else {
             quote! {
-                #vis struct #name #struct_generics (core::marker::PhantomData<#phantom_tuple>)
-                #where_clause;
+                #vis struct #name #struct_generics (core::marker::PhantomData<#phantom_tuple>);
             }
         };
 
+        let default_expr = if generics.params.is_empty() {
+            quote! { Self }
+        } else {
+            quote! { Self(core::marker::PhantomData) }
+        };
+
         let stream = quote! {
             #(#doc_attributes)*
             #[allow(non_camel_case_types)]
-            #[derive(Default)]
             #struct_def
 
+            impl #impl_generics ::core::default::Default for #name #ty_generics {
+                fn default() -> Self {
+                    #default_expr
+                }
+            }
+
             impl #impl_generics ::actix_web::dev::HttpServiceFactory for #name #ty_generics
             #where_clause
             {