) -> Result<(git2::Object<'a>, BTreeSet<PathBuf>), anyhow::Error> {

) -> Result<(git2::Object<'a>, BTreeSet<PathBuf>, BTreeSet<PathBuf>), anyhow::Error> {

    let mut prefixes_deleted = BTreeSet::new();

                        prefixes.insert(old_path);

                        debug!("deleted file = {:?}", old_path);
                        prefixes_deleted.insert(old_path);

    Ok((object, prefixes))

    Ok((object, prefixes, prefixes_deleted))

    let (object, prefixes) = git_reset(git, repo, &txn, &channel, child, stats)?;

    let (object, prefixes, prefixes_deleted) = git_reset(git, repo, &txn, &channel, child, stats)?;

    debug!("prefixes_deleted = {:?}", prefixes_deleted);

        use path_slash::PathExt;

            use path_slash::PathExt;

    for p in prefixes_deleted.iter() {
        use path_slash::PathExt;
        let p = p.to_slash_lossy();
        txn_.remove_file(&p).map(|_| ()).unwrap_or(());
    }