Deriving ..?

Im curious to know how the `deriving' keyword has been implemented, and more so as to how it may be extended for any user defined type class w/o resorting to an external program like DriFt. Thanks! -Amit. ------------------------------------------------------------------- Amit Garg | Office: ACES 6SEo4E Graduate Student | Phone : (512) 232-7875 Computer Sciences | Res : 2000 Pearl St. #207 University of Texas at Austin | Phone : (512) xxx-xxxx Homepage: http://www.cs.utexas.edu/~amitji -------------------------------------------------------------------