use git_object::borrowed; /// A borrowed object using a borrowed slice as backing buffer.#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]pub struct Object<'a> {    pub kind: git_object::Kind,    pub data: &'a [u8],} impl<'a> Object<'a> {    pub fn decode(&self) -> Result<borrowed::Object<'_>, borrowed::Error> {        Ok(match self.kind {            git_object::Kind::Tree => borrowed::Object::Tree(borrowed::Tree::from_bytes(self.data)?),            git_object::Kind::Blob => borrowed::Object::Blob(borrowed::Blob { data: self.data }),            git_object::Kind::Commit => borrowed::Object::Commit(borrowed::Commit::from_bytes(self.data)?),            git_object::Kind::Tag => borrowed::Object::Tag(borrowed::Tag::from_bytes(self.data)?),        })    }} pub mod verify {    use crate::{hash, loose};    use git_object::{borrowed, owned};    use std::io;     #[derive(thiserror::Error, Debug)]    pub enum Error {        #[error("Object expected to have id {desired}, but actual id was {actual}")]        ChecksumMismatch { desired: owned::Id, actual: owned::Id },    }     impl crate::borrowed::Object<'_> {        pub fn verify_checksum(&self, desired: borrowed::Id<'_>) -> Result<(), Error> {            let mut sink = hash::Write::new(io::sink(), desired.kind());             loose::object::header::encode(self.kind, self.data.len() as u64, &mut sink).expect("hash to always work");            sink.hash.update(&self.data);             let actual_id = owned::Id::from(sink.hash.digest());            if desired != actual_id.to_borrowed() {                return Err(Error::ChecksumMismatch {                    desired: desired.into(),                    actual: actual_id,                });            }            Ok(())        }    }}