rectify some previously dead code

src/service/context/extensions.rs

@@ -140,7 +140,6 @@ impl fmt::Debug for Extensions {
 trait AnyClone: Any {
     fn clone_box(&self) -> Box<dyn AnyClone + Send + Sync>;
     fn as_any(&self) -> &dyn Any;
-    fn as_any_mut(&mut self) -> &mut dyn Any;
     fn into_any(self: Box<Self>) -> Box<dyn Any>;
 }
 
@@ -153,10 +152,6 @@ impl<T: Clone + Send + Sync + 'static> AnyClone for T {
         self
     }
 
-    fn as_any_mut(&mut self) -> &mut dyn Any {
-        self
-    }
-
     fn into_any(self: Box<Self>) -> Box<dyn Any> {
         self
     }

src/service/layer/into_error.rs

@@ -5,7 +5,7 @@
 /// Utility error trait to allow Rama layers
 /// to return a default error as well as a user-defined one,
 /// being it a [`Clone`]-able type or a [`Fn`] returning an error type.
-pub trait MakeLayerError: Send + Sync + 'static {
+pub trait MakeLayerError: sealed::Sealed + Send + Sync + 'static {
     /// The error type returned by the layer.
     ///
     /// It does not need to be an actual error type,
@@ -81,7 +81,7 @@ where
 }
 
 mod sealed {
-    pub(super) trait Sealed {}
+    pub trait Sealed {}
 
     impl<F> Sealed for super::LayerErrorFn<F> {}
     impl<E> Sealed for super::LayerErrorStatic<E> {}