use git_hash::ObjectId;use git_traverse::commit::{ancestors, Ancestors}; pub trait Sealed {} pub type AncestorsIter<Find> = Ancestors<Find, fn(&git_hash::oid) -> bool, ancestors::State>; /// An extension trait to add functionality to [`ObjectId`]s.pub trait ObjectIdExt: Sealed {    /// Create an iterator over the ancestry of the commits reachable from this id, which must be a commit.    fn ancestors<Find, E>(self, find: Find) -> AncestorsIter<Find>    where        Find: for<'a> FnMut(&git_hash::oid, &'a mut Vec<u8>) -> Result<git_object::CommitRefIter<'a>, E>,        E: std::error::Error + Send + Sync + 'static;     /// Infuse this object id `repo` access.    fn attach(self, repo: &crate::Repository) -> crate::Id<'_>;} impl Sealed for ObjectId {} impl ObjectIdExt for ObjectId {    fn ancestors<Find, E>(self, find: Find) -> AncestorsIter<Find>    where        Find: for<'a> FnMut(&git_hash::oid, &'a mut Vec<u8>) -> Result<git_object::CommitRefIter<'a>, E>,        E: std::error::Error + Send + Sync + 'static,    {        Ancestors::new(Some(self), ancestors::State::default(), find)    }     fn attach(self, repo: &crate::Repository) -> crate::Id<'_> {        crate::Id::from_id(self, repo)    }}