Turn messages into stub SubscribeMessage struct

src/snapshot/patch.rs

@@ -60,6 +60,7 @@ pub struct PatchUpdate {
 ///
 // TODO: Introduce machinery to detect conflicts, like keeping previous +
 // current values in all fields.
+#[derive(Debug, Clone)]
 pub struct AppliedPatchSet {
     pub removed: Vec<RbxId>,
     pub added: Vec<AppliedPatchAdd>,
@@ -76,10 +77,12 @@ impl AppliedPatchSet {
     }
 }
 
+#[derive(Debug, Clone)]
 pub struct AppliedPatchAdd {
     pub instance_id: RbxId,
 }
 
+#[derive(Debug, Clone)]
 pub struct AppliedPatchUpdate {
     pub id: RbxId,