I noticed this while going through the SOE book: $ hugs __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ 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: November 2002 _________________________________________ Haskell 98 mode: Restart with command line option -98 to enable extensions Reading file "/lusr/lib/hugs/lib/Prelude.hs": Hugs session for: /lusr/lib/hugs/lib/Prelude.hs Type :? for help Prelude> :load Memo Reading file "/lusr/lib/hugs/lib/exts/Memo.hs": Reading file "/lusr/lib/hugs/lib/exts/ST.hs": Reading file "/lusr/lib/hugs/lib/Array.hs": Reading file "/lusr/lib/hugs/lib/Ix.hs": Reading file "/lusr/lib/hugs/lib/List.hs": Reading file "/lusr/lib/hugs/lib/Maybe.hs": Reading file "/lusr/lib/hugs/lib/List.hs": Reading file "/lusr/lib/hugs/lib/Array.hs": Reading file "/lusr/lib/hugs/lib/exts/IOExts.hs": Reading file "/lusr/lib/hugs/lib/IO.hs": Reading file "/lusr/lib/hugs/lib/exts/IORef.lhs": Reading file "/lusr/lib/hugs/lib/exts/IOExts.hs": Reading file "/lusr/lib/hugs/lib/Monad.hs": Reading file "/lusr/lib/hugs/lib/exts/ST.hs": Parsing ERROR "/lusr/lib/hugs/lib/exts/ST.hs":49 - Syntax error in type expression (unexpected `.') Monad> I don't know enough about Haskell to figure out what the problem is. There are at least a couple other modules in the exts directory that apparently show similar errors: ParsecToken, LazyST. Am I looking at a bug or did I do something wrong? Tommy McGuire