use std::{    borrow::Cow,    convert::TryInto,    path::{Path, PathBuf},}; use git_object::bstr::{BStr, BString, ByteSlice, ByteVec};use os_str_bytes::OsStrBytes; use crate::{Namespace, PartialNameRef}; impl Namespace {    /// Dissolve ourselves into the interior representation    pub fn into_bstring(self) -> BString {        self.0    }    /// Return ourselves as    pub fn as_bstr(&self) -> &BStr {        self.0.as_ref()    }    /// Return ourselves as a path for use within the filesystem.    pub fn to_path(&self) -> Cow<'_, Path> {        self.0.to_path().expect("UTF-8 conversion succeeds").into()    }    /// Append the given `prefix` to this namespace so it becomes usable for prefixed iteration.    pub fn into_namespaced_prefix(mut self, prefix: impl AsRef<Path>) -> PathBuf {        self.0.push_str(prefix.as_ref().to_raw_bytes());        #[cfg(windows)]        let path = self.0.replace(b"/", b"\\").into_path_buf();        #[cfg(not(windows))]        let path = self.0.replace(b"\\", b"/").into_path_buf();        path.expect("UTF-8 conversion succeeds")    }} /// Given a `namespace` 'foo we output 'refs/namespaces/foo', and given 'foo/bar' we output 'refs/namespaces/foo/refs/namespaces/bar'.////// For more information, consult the [git namespace documentation](https://git-scm.com/docs/gitnamespaces).pub fn expand<'a, Name, E>(namespace: Name) -> Result<Namespace, git_validate::refname::Error>where    Name: TryInto<PartialNameRef<'a>, Error = E>,    git_validate::refname::Error: From<E>,{    let namespace = namespace.try_into()?.0;    let mut out = BString::default();    for component in namespace.split_str(b"/") {        out.push_str("refs/namespaces/");        out.push_str(component);        out.push_str(b"/");    }    Ok(Namespace(out))}