axum: remove silencing of unreachable patterns that no longer trigger

Backport to beta occurred in rust-lang/rust#129103
and stable never implemented this warning

axum/src/handler/mod.rs

@@ -328,8 +328,6 @@ where
             ) -> _,
         > = svc.oneshot(req).map(|result| match result {
             Ok(res) => res.into_response(),
-
-            #[allow(unreachable_patterns)]
             Err(err) => match err {},
         });
 

axum/src/middleware/from_fn.rs

@@ -345,8 +345,6 @@ impl Next {
     pub async fn run(mut self, req: Request) -> Response {
         match self.inner.call(req).await {
             Ok(res) => res,
-
-            #[allow(unreachable_patterns)]
             Err(err) => match err {},
         }
     }

axum/src/middleware/map_response.rs

@@ -278,8 +278,6 @@ macro_rules! impl_service {
                         Ok(res) => {
                             f($($ty,)* res).await.into_response()
                         }
-
-                        #[allow(unreachable_patterns)]
                         Err(err) => match err {}
                     }
                 });

axum/src/routing/route.rs

@@ -230,8 +230,6 @@ impl Future for InfallibleRouteFuture {
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         match futures_util::ready!(self.project().future.poll(cx)) {
             Ok(response) => Poll::Ready(response),
-
-            #[allow(unreachable_patterns)]
             Err(err) => match err {},
         }
     }