EntityHashSet can't be used as a relationship target collection because it doesn't implement VisitEntitiesMut #18243
Description
Bevy version
Main branch 3b9e2e6
What you did
- Tried to implement
RelationshipSourceCollectionforEntityIndexMap. - Encountered error.
- Attempted to use
EntityHashSetto double check. - Same error.
What went wrong
The Component derive macro implements visit_entities_mut by using VisitEntitiesMut. EntityHashSet and friends can't implement VisitEntitiesMut since mutable access to it's keys could break internal invariants.