///pub mod set_target_id {    use git_ref::{transaction::PreviousValue, Target};     use crate::{bstr::BString, Reference};     mod error {        use git_ref::FullName;         /// The error returned by [`Reference::set_target_id()`][super::Reference::set_target_id()].        #[derive(Debug, thiserror::Error)]        #[allow(missing_docs)]        pub enum Error {            #[error("Cannot change symbolic reference {name:?} into a direct one by setting it to an id")]            SymbolicReference { name: FullName },            #[error(transparent)]            ReferenceEdit(#[from] crate::reference::edit::Error),        }    }    pub use error::Error;     impl<'repo> Reference<'repo> {        /// Set the id of this direct reference to `id` and use `reflog_message` for the reflog (if enabled in the repository).        ///        /// Note that the operation will fail on symbolic references, to change their type use the lower level reference database,        /// or if the reference was deleted or changed in the mean time.        /// Furthermore, refrain from using this method for more than a one-off change as it creates a transaction for each invocation.        /// If multiple reference should be changed, use [Repository::edit_references()][crate::Repository::edit_references()]        /// or the lower level reference database instead.        pub fn set_target_id(            &mut self,            id: impl Into<git_hash::ObjectId>,            reflog_message: impl Into<BString>,        ) -> Result<(), Error> {            match &self.inner.target {                Target::Symbolic(name) => return Err(Error::SymbolicReference { name: name.clone() }),                Target::Peeled(current_id) => {                    let changed = self.repo.reference(                        self.name(),                        id,                        PreviousValue::MustExistAndMatch(Target::Peeled(current_id.to_owned())),                        reflog_message,                    )?;                    *self = changed;                }            }            Ok(())        }    }} ///pub mod delete {    use git_ref::transaction::{Change, PreviousValue, RefEdit, RefLog};     use crate::Reference;     impl<'repo> Reference<'repo> {        /// Delete this reference or fail if it was changed since last observed.        /// Note that this instance remains available in memory but probably shouldn't be used anymore.        pub fn delete(&self) -> Result<(), crate::reference::edit::Error> {            self.repo                .edit_reference(RefEdit {                    change: Change::Delete {                        expected: PreviousValue::MustExistAndMatch(self.inner.target.clone()),                        log: RefLog::AndReference,                    },                    name: self.inner.name.clone(),                    deref: false,                })                .map(|_| ())        }    }}