for changeIndex := len(changes) - 1; changeIndex >= 0; changeIndex-- {
		c := changes[changeIndex]

	stream := new(FastExportStream)
	for changeIndex, c := range changes {

		commit.Mark = nextMark()

		if err := commit.WriteTo(os.Stdout); err != nil {
			printErrorAndExit("Error writing commit:", err)
		}

		stream.AddCommit(commit)
	}
	stream.ReverseCommits()
	if err := stream.WriteTo(os.Stdout); err != nil {
		printErrorAndExit("Error writing output stream:", err)

	}
	return nil
}
// A FastExportStream is an in-memory representation of a fast-export stream.
type FastExportStream struct {
	Commits []Commit
	marks int
}
func (f *FastExportStream) AddCommit(c Commit) {
	if c.Mark == 0 {
		f.marks++
		c.Mark = f.marks
	}
	f.Commits = append(f.Commits, c)
}
func (f *FastExportStream) ReverseCommits() {
	for i, j := 0, len(f.Commits)-1; j > i; i, j = i+1, j-1 {
		f.Commits[i], f.Commits[j] = f.Commits[j], f.Commits[i]

}
func (f *FastExportStream) WriteTo(w io.Writer) error {
	for _, c := range f.Commits {
		if err := c.WriteTo(w); err != nil {
			return err
		}
	}