diff --git a/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs b/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs
index 8c8831aa31757..3a3572a0ffb7c 100644
--- a/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs
+++ b/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs
@@ -1403,7 +1403,7 @@ impl Backend for TurboTasksBackend {
         _: TaskId,
         _: &dyn TurboTasksBackendApi<Self>,
     ) -> AutoMap<RawVc, i32, BuildHasherDefault<FxHasher>, 1> {
-        todo!()
+        Default::default()
     }
 
     fn emit_collectible(
@@ -1413,7 +1413,7 @@ impl Backend for TurboTasksBackend {
         _: TaskId,
         _: &dyn TurboTasksBackendApi<Self>,
     ) {
-        todo!()
+        // todo!("emit_collectible");
     }
 
     fn unemit_collectible(
@@ -1424,7 +1424,7 @@ impl Backend for TurboTasksBackend {
         _: TaskId,
         _: &dyn TurboTasksBackendApi<Self>,
     ) {
-        todo!()
+        // todo!("emit_collectible");
     }
 
     fn update_task_cell(
@@ -1453,7 +1453,8 @@ impl Backend for TurboTasksBackend {
     ) -> TaskId {
         self.0.create_transient_task(task_type)
     }
+
     fn dispose_root_task(&self, _: TaskId, _: &dyn TurboTasksBackendApi<Self>) {
-        todo!()
+        // todo!("dispose_root_task");
     }
 }