Fixed more compile time errors

src/service/rooms/alias/data.rs

@@ -1,24 +1,29 @@
 use ruma::{RoomId, RoomAliasId};
+use crate::Result;
 
 pub trait Data {
     /// Creates or updates the alias to the given room id.
     fn set_alias(
+        &self,
         alias: &RoomAliasId,
         room_id: &RoomId
     ) -> Result<()>;
 
     /// Forgets about an alias. Returns an error if the alias did not exist.
     fn remove_alias(
+        &self,
         alias: &RoomAliasId,
     ) -> Result<()>;
 
     /// Looks up the roomid for the given alias.
     fn resolve_local_alias(
+        &self,
         alias: &RoomAliasId,
-    ) -> Result<()>;
+    ) -> Result<Option<Box<RoomId>>>;
 
     /// Returns all local aliases that point to the given room
     fn local_aliases_for_room(
-        alias: &RoomAliasId,
-    ) -> Result<()>;
+        &self,
+        room_id: &RoomId,
+    ) -> Result<Box<dyn Iterator<Item=String>>>;
 }