Hello, This is probably already known, but I didn't see it on the list of bugs. I got the Hugs98 distribution from hugs98-Nov2002.zip. When loading the Trex module, I get the error shown below. Replacing the Trex.hs file with the one from the Dec 2001 distribution and Trex works fine. Thanks, Bo || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2002 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs@haskell.org || || Version: Nov 2002 _______________________________________________ Haskell 98 mode: Restart with command line option -98 to enable extensions Reading file "D:\hugs98-Nov2002\hugs98\lib\Prelude.hs": Hugs session for: D:\hugs98-Nov2002\hugs98\lib\Prelude.hs Type :? for help Prelude> :load Trex Reading file "D:\hugs98-Nov2002\hugs98\lib\hugs\Trex.hs": ERROR "D:\hugs98-Nov2002\hugs98\lib\hugs\Trex.hs" - Illegal export of a lone dat a constructor "EmptyRec" Prelude>