use std::io; use bstr::ByteSlice; use crate::{encode, encode::NL, Commit}; impl Commit {    /// Serializes this instance to `out` in the git serialization format.    pub 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 {            let has_newline = value.find_byte(b'\n').is_some();            if has_newline {                encode::header_field_multi_line(name, value, &mut out)?;            } else {                encode::trusted_header_field(name, value, &mut out)?;            }        }        out.write_all(NL)?;        out.write_all(&self.message)    }}