pub(super) fn conflicted_subgraph_dfs<Fetch, Fut, Pdu>( conflicted_set: &Vec<&OwnedEventId>, fetch: &Fetch, ) -> impl Stream<Item = OwnedEventId> + Sendwhere Fetch: Fn(OwnedEventId) -> Fut + Sync, Fut: Future<Output = Result<Pdu>> + Send, Pdu: Event,