Implement IntoResponse for (R,) where R: IntoResponse (#2143)

axum-core/src/response/into_response.rs

@@ -449,6 +449,16 @@ where
     }
 }
 
+impl<R> IntoResponse for (R,)
+where
+    R: IntoResponse,
+{
+    fn into_response(self) -> Response {
+        let (res,) = self;
+        res.into_response()
+    }
+}
+
 macro_rules! impl_into_response {
     ( $($ty:ident),* $(,)? ) => {
         #[allow(non_snake_case)]

axum-macros/tests/debug_handler/fail/wrong_return_type.stderr

@@ -9,10 +9,10 @@ error[E0277]: the trait bound `bool: IntoResponse` is not satisfied
             &'static [u8]
             &'static str
             ()
+            (R,)
             (Response<()>, R)
             (Response<()>, T1, R)
             (Response<()>, T1, T2, R)
-            (Response<()>, T1, T2, T3, R)
           and $N others
 note: required by a bound in `__axum_macros_check_handler_into_response::{closure#0}::check`
  --> tests/debug_handler/fail/wrong_return_type.rs:4:23

axum/CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 # Unreleased
 
-- None.
+- **added:** Implement `IntoResponse` for `(R,) where R: IntoResponse` ([#2143])
+
+[#2143]: https://github.com/tokio-rs/axum/pull/2143
 
 # 0.6.20 (03. August, 2023)