optimize service combinators memory layout

actix-service/src/map_init_err.rs

@@ -60,16 +60,15 @@ where
     }
 }
 
-pin_project! {
-    pub struct MapInitErrFuture<A, F, E>
-    where
-        A: ServiceFactory,
-        F: Fn(A::InitError) -> E,
-    {
-        f: F,
-        #[pin]
-        fut: A::Future,
-    }
+#[pin_project::pin_project]
+pub struct MapInitErrFuture<A, F, E>
+where
+    A: ServiceFactory,
+    F: Fn(A::InitError) -> E,
+{
+    f: F,
+    #[pin]
+    fut: A::Future,
 }
 
 impl<A, F, E> MapInitErrFuture<A, F, E>