Maybe you have seen some mail lately on this list about something called "Haskell 1.3", and wondered What is this "Haskell 1.3" anyway?, Can I buy it?, or Do I have it? By compiling and running the following two-module Haskell program, you will at least get an answer to the last question. -------------- Put in M.hs ------- module M where data M = M M | N () -------------- Put in Main.hs ---- import M main = interact (const (case (M.N) () of M (N ()) -> "No\n"; N () -> "Yes\n")) ----------------------------------- Magnus & Thomas