use std::fmt; use quick_error::quick_error; use crate::Kind; quick_error! {    /// The Error used in [`Kind::from_bytes()`].    #[derive(Debug, Clone)]    #[allow(missing_docs)]    pub enum Error {        InvalidObjectKind(kind: crate::BString) {            display("Unknown object kind: {:?}", kind)        }    }} impl Kind {    /// Parse a `Kind` from its serialized loose git objects.    pub fn from_bytes(s: &[u8]) -> Result<Kind, Error> {        Ok(match s {            b"tree" => Kind::Tree,            b"blob" => Kind::Blob,            b"commit" => Kind::Commit,            b"tag" => Kind::Tag,            _ => return Err(Error::InvalidObjectKind(s.into())),        })    }     /// Return the name of `self` for use in serialized loose git objects.    pub fn as_bytes(&self) -> &[u8] {        match self {            Kind::Tree => b"tree",            Kind::Commit => b"commit",            Kind::Blob => b"blob",            Kind::Tag => b"tag",        }    }} impl fmt::Display for Kind {    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {        f.write_str(std::str::from_utf8(self.as_bytes()).expect("Converting Kind name to utf8"))    }}