!  diff my_version.txt bens_version.txt 
25a26
>   nil
60c61
<   print line_number + ": " if show_line_numbers
---
>   print "[%04d] " % line_number if show_line_numbers
66c67
<   to_eval.each {|l| Readline::HISTORY << l}
---
>   
67a69,70
>   
>   to_eval.each {|l| Readline::HISTORY << l}