add a comment to clarify

bevyengine · Aug 7, 2022 · 255a88c · 255a88c
1 parent 1fe075a
commit 255a88c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/crates/bevy_ecs/src/schedule/label.rs b/crates/bevy_ecs/src/schedule/label.rs
@@ -179,6 +179,8 @@ impl Labels {
             let mut set = IndexSet::default();
             let (idx, _) = set.insert_full(val.clone());
             let old = type_map.insert(set);
+            // We already checked that there is no set for type `L`,
+            // so let's avoid generating useless drop code for the "previous" entry.
             std::mem::forget(old);
             idx as u64
         }