I downloaded Fran and had a go at running the demos\test.hs C:\hugs98>hugs +o __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-1999 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs@haskell.org || || Version: May 1999 _________________________________________ Hugs mode: Restart with command line option +98 for Haskell 98 mode Reading file "c:\hugs98\lib\Prelude.hs": Hugs session for: c:\hugs98\lib\Prelude.hs Type :? for help Prelude> ERROR "c:\hugs98\lib\Fran\src/ShowFunctions.hs" (line 5): Overlapping instances for class "Show" *** This instance : Show (a -> b) *** Overlaps with : Show (a -> b) *** Common instance : Show (a -> b) I edited ShowFunctions to get rid of the overlapping instance: -- From QuickCheck distribution. module ShowFunctions where {- instance Show (a->b) where show f = "<function>" -} But then ran into another problem: Reading file "c:\hugs98\lib\Fran\src/RenderImage.hs": ERROR "c:\hugs98\lib\Fran\src/RenderImage.hs": Entity "readFile" imported from m odule "Win32" already defined in module "Prelude" SoundB> I was a bit reluctant to modify Prelude or Win32. Can anyone help? Is it just that I'm on a back release on Hugs? Dominic Steinitz ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com