[Haskell-cafe] Typing Haskell in Haskell

Hi, I am relatively new to Haskell. I am attempting to get "Typing Haskell in Haskell" to work on HUGS or GHC. http://web.cecs.pdx.edu/~mpj/thih/ I am getting an error on loading SourcePrelude :- Hugs> :l SourcePrelude ERROR ".\PPrint.hs" - Can't find imported module "Pretty" And I cannot find a Pretty module, the module and "Language.Haskell.Pretty" does not seem to be what is required. Any help welcome, Aaron