messing with trait objects

src/service/rooms/alias/data.rs

@@ -25,5 +25,5 @@ pub trait Data {
     fn local_aliases_for_room(
         &self,
         room_id: &RoomId,
-    ) -> Result<Box<dyn Iterator<Item=String>>>;
+    ) -> Box<dyn Iterator<Item = Result<Box<RoomAliasId>>>>;
 }

src/service/rooms/alias/mod.rs

@@ -4,11 +4,11 @@ pub use data::Data;
 use ruma::{RoomAliasId, RoomId};
 use crate::Result;
 
-pub struct Service<D: Data> {
-    db: D,
+pub struct Service {
+    db: Box<dyn Data>,
 }
 
-impl<D: Data> Service<D> {
+impl Service {
     #[tracing::instrument(skip(self))]
     pub fn set_alias(
         &self,