Hi, I am trying to get some pieces of Fudgets work in Javascript, and tried to compile some basic modules (stream processor primitives). My goal is to be able to compile unmodified code in its current (pre-cabalized) layout (there are more than 300 modules in Fudgets, so it is easy to break something if changing a lot) I cannot compile EitherUtils.hs http://www.golubovsky.org/repos/Fudgets/hsrc/utils/EitherUtils.hs ========================== Compiling EitherUtils ( ../../../home/dima/ext/workdirs/Fudgets/hsrc/utils/EitherUtils.hs ) yhc: The class Prelude.Functor has no instance for the type Prelude.Maybe. Possible sources for the problem are: 7:13-7:16 When type checking declarations at: 7:1-7:34 ========================== The line in question is: plookup p = fmap snd . find (p.fst) Commenting it out makes the module compilable, but plookup is indeed used somewhere. There was no needed instance in Prelude.hs. I added it (from Hugs, but I believe it is standard): instance Functor Maybe where fmap _ Nothing = Nothing fmap f (Just a) = Just (f a) and then recompiled everything under packages. The problem did not disappear. I even replaced `import Maybe' with `import Data.Maybe', it did not help. I moved the instance definition to Data/Maybe.hs, again no help. What could it be? Thanks. PS Fudgets were compilable by NHC98, weren't they? -- Dimitry Golubovsky Anywhere on the Web