Actually, it may be good not to apply this patch yet. Kannan has found a similar function in System.FilePath http://haskell.org/ghc/docs/latest/html/libraries/filepath/System-FilePath-Posix.html#v:isValid -- Eric Kow <http://www.nltg.brighton.ac.uk/home/Eric.Kow> PGP Key ID: 08AC04F9