gen := source(result)
	out := bufio.NewWriter(os.Stdout)
	for have, added, mark := gen(); have; have, added, mark = gen() {
		var from []line = hd.line(!added)

		fmt.Fprintln(out)
		for i := mark.From; i < mark.Length; i++ {
			fmt.Fprint(out, i)
			fmt.Fprint(out, i+1) // Line numbers start from 1 for most people :)
			if added {
				fmt.Fprint(out, " > ")
			} else {
				fmt.Fprint(out, " < ")
			}
			fmt.Fprintln(out, from[i].text)
		}