use std::path::PathBuf; use git_pack::multi_index::File; fn multi_index() -> (File, PathBuf) {    let path = crate::scripted_fixture_read_only("make_pack_gen_repo_multi_index.sh")        .expect("test fixture exists")        .join(".git/objects/pack/multi-pack-index");    let file = git_pack::multi_index::File::at(&path).unwrap();    (file, path)} mod access; mod verify; mod write;