use git_hash::ObjectId;use git_object::immutable;use std::collections::VecDeque; #[derive(Default, Clone)]pub struct State<PathId: Default + Clone> {    buf1: Vec<u8>,    buf2: Vec<u8>,    trees: VecDeque<TreeInfoPair<PathId>>,} type TreeInfoPair<PathId> = (Option<TreeInfo<PathId>>, Option<TreeInfo<PathId>>); #[derive(Clone)]pub(crate) struct TreeInfo<PathId: Clone> {    pub tree_id: ObjectId,    pub parent_path_id: PathId,} impl<P: Clone + Default> State<P> {    pub fn clear(&mut self) {        self.trees.clear();        self.buf1.clear();        self.buf2.clear();    }} pub struct Changes<'a>(Option<immutable::TreeIter<'a>>); impl<'a, T> From<T> for Changes<'a>where    T: Into<Option<immutable::TreeIter<'a>>>,{    fn from(v: T) -> Self {        Changes(v.into())    }} mod changes; pub mod record;pub use record::Record; pub mod recorder;pub use recorder::Recorder;