There once was a bug in Text.PrettyPrint.HughesPJ causing it to print infinitely many spaces. http://haskell.org/pipermail/glasgow-haskell-users/2001-November/002584.html It seems this code has re-appeared in the ghc-6.0 libraries:

spaces 0 = "" spaces n = ' ' : spaces (n - 1)

this should be replicate n ' ' or something that behaves nicely for negative arguments. (that shouldn't of course be there in the first place but this seems harder to fix. somehow related to nesting, etc.) Best regards, -- -- Johannes Waldmann ---- http://www.informatik.uni-leipzig.de/~joe/ -- -- joe@informatik.uni-leipzig.de -- phone/fax (+49) 341 9732 204/209 --