Another newbie question, but I can't seem to find any answers on the web... Can someone tell me what's wrong with this? import qualified System.Posix.Directory as PD readdirAll :: PD.DirStream -> IO [String] readdirAll d = do dir <- PD.readDirStream d if dir == "" then return [] else rest <- readdirAll d return (dir:rest) Compiling with GHC 6.6.1 gives me the not-very-useful message "Parse error in pattern", pointing to the "i" of "if". I've tried all kinds of alternative indentations (including indenting the "else" more), bracketings etc, but nothing helps. Thanks David -- The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE.