Hello, > LexCore is the lexer for "ExternalCore". > http://www.haskell.org/ghc/docs/papers/core.ps.gz > > For your purposes, you can ignore it. thank you for this information. I have checked out the latest cvs tree and thereby I have noticed, that Lex.lhs is now replaced by an alex file. GHC is changing so fast... Regards, Steffen Mazanek