Manually implement Clone for MessageStack

This allows us to drop the M: Clone bound as it is not needed

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

mycelium/src/message.rs

@@ -85,11 +85,7 @@ pub type Checksum = [u8; MESSAGE_CHECKSUM_LENGTH];
 /// Response type when pushing a message.
 pub type MessagePushResponse = (MessageId, Option<watch::Receiver<Option<ReceivedMessage>>>);
 
-#[derive(Clone)]
-pub struct MessageStack<M>
-where
-    M: Clone,
-{
+pub struct MessageStack<M> {
     // The DataPlane is wrappen in a Mutex since it does not implement Sync.
     data_plane: Arc<Mutex<DataPlane<M>>>,
     inbox: Arc<Mutex<MessageInbox>>,
@@ -1055,6 +1051,18 @@ where
     }
 }
 
+impl<M> Clone for MessageStack<M> {
+    fn clone(&self) -> Self {
+        Self {
+            data_plane: self.data_plane.clone(),
+            inbox: self.inbox.clone(),
+            outbox: self.outbox.clone(),
+            subscriber: self.subscriber.clone(),
+            reply_subscribers: self.reply_subscribers.clone(),
+        }
+    }
+}
+
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct MessageInfo {