use gix_diff::{    rewrites::tracker::ChangeKind,    tree::visit::{ChangeId, Relation},};use gix_hash::{oid, ObjectId};use gix_object::tree::{EntryKind, EntryMode}; mod tracker; #[derive(Debug, Clone, Copy, PartialEq, Eq)]pub struct Change {    id: ObjectId,    kind: ChangeKind,    mode: EntryMode,    relation: Option<Relation>,} impl gix_diff::rewrites::tracker::Change for Change {    fn id(&self) -> &oid {        &self.id    }     fn relation(&self) -> Option<Relation> {        self.relation    }     fn kind(&self) -> ChangeKind {        self.kind    }     fn entry_mode(&self) -> EntryMode {        self.mode    }     fn id_and_entry_mode(&self) -> (&oid, EntryMode) {        (&self.id, self.mode)    }} const NULL_ID: gix_hash::ObjectId = gix_hash::Kind::Sha1.null(); impl Change {    fn modification() -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Modification,            mode: EntryKind::Blob.into(),            relation: None,        }    }    fn deletion() -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Deletion,            mode: EntryKind::Blob.into(),            relation: None,        }    }    fn addition() -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Addition,            mode: EntryKind::Blob.into(),            relation: None,        }    }     fn addition_in_tree(id: ChangeId) -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Addition,            mode: EntryKind::Blob.into(),            relation: Some(Relation::ChildOfParent(id)),        }    }     fn deletion_in_tree(id: ChangeId) -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Deletion,            mode: EntryKind::Blob.into(),            relation: Some(Relation::ChildOfParent(id)),        }    }     fn tree_addition(id: ChangeId) -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Addition,            mode: EntryKind::Tree.into(),            relation: Some(Relation::Parent(id)),        }    }     fn tree_deletion(id: ChangeId) -> Self {        Change {            id: NULL_ID,            kind: ChangeKind::Deletion,            mode: EntryKind::Tree.into(),            relation: Some(Relation::Parent(id)),        }    }}