use std::io; use crate::{encode, encode::NL, Commit, CommitRef, Kind}; impl crate::WriteTo for Commit {    /// Serializes this instance to `out` in the git serialization format.    fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {        encode::trusted_header_id(b"tree", &self.tree, &mut out)?;        for parent in &self.parents {            encode::trusted_header_id(b"parent", parent, &mut out)?;        }        encode::trusted_header_signature(b"author", &self.author.to_ref(), &mut out)?;        encode::trusted_header_signature(b"committer", &self.committer.to_ref(), &mut out)?;        if let Some(encoding) = self.encoding.as_ref() {            encode::header_field(b"encoding", encoding, &mut out)?;        }        for (name, value) in &self.extra_headers {            encode::header_field_multi_line(name, value, &mut out)?;        }        out.write_all(NL)?;        out.write_all(&self.message)    }     fn kind(&self) -> Kind {        Kind::Commit    }} impl<'a> crate::WriteTo for CommitRef<'a> {    /// Serializes this instance to `out` in the git serialization format.    fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {        encode::trusted_header_id(b"tree", &self.tree(), &mut out)?;        for parent in self.parents() {            encode::trusted_header_id(b"parent", &parent, &mut out)?;        }        encode::trusted_header_signature(b"author", &self.author, &mut out)?;        encode::trusted_header_signature(b"committer", &self.committer, &mut out)?;        if let Some(encoding) = self.encoding.as_ref() {            encode::header_field(b"encoding", encoding, &mut out)?;        }        for (name, value) in &self.extra_headers {            encode::header_field_multi_line(name, value, &mut out)?;        }        out.write_all(NL)?;        out.write_all(self.message)    }     fn kind(&self) -> Kind {        Kind::Commit    }}