Bernd Brassel wrote:

Is it already a known problem that the preprocessor cannot cope with the whole set of possible string declarations?

Yes, it is: http://hackage.haskell.org/trac/hackage/ticket/146 I ran into it lately. I was totally unaware of what caused GHC's parse error on a valid line until someone on the IRC channel pointed it out. According to the ticket, cpphs (a Haskell-oriented CPP replacement) does get it right. Regards, Reinier