Function settle_listing 

fn settle_listing(
    rx: Receiver<ListedObject>,
    listing: AbortOnDropHandle<Result<()>>,
    path: String,
) -> BoxStream<'static, Result<ListedObject>>

Yields the objects listing sends over rx. Once the listing finished it is settled before any further object is yielded, so its failure goes before the objects it listed that the caller has not taken yet.