I'm trying to work my way through the hitchhikers guide, knowing nothing about Haskell (my day-to-day programming is in Python with a sprinkling of C). I've installed a binary distribution of Haskell Platform on my Mac. GHCi reports version 6.12.3. I'm currently in "3 Chapter 2: Parsing the input". I'm stuck on the module Main definition. In hello.hs it works as expected: module Main where main = putStrLn "Hello world!" but in my nascent cd fitting code I get a parse error at the token "module" ("parse error on input `module'"): import Text.ParserCombinators.Parsec -- parseInput parses output of "du -sb", which consists of many lines, -- each of which describes single directory parseInput = do dirs <- many dirAndSize eof return dirs -- Datatype Dir holds information about single directory - its size and name data Dir = Dir Int String deriving Show -- `dirAndSize` parses information about single directory, which is: -- a size in bytes (number), some spaces, then directory name, which extends till newline dirAndSize = do size <- many1 digit spaces dir_name <- anyChar `manyTill` newline return (Dir (read size) dir_name) module Main where main = do input <- getContents putStrLn ("DEBUG: got input " ++ input) When I comment out from "module Main where" to the end of the file runhaskell complains "Not in scope: `main'", suggesting that the parse of the code above it succeeded. When I comment out all the code above "module Main where" and run it, it displays what's on stdin. It would appear there is some sort of problem with the dirAndSize definition above that, but if that was the case why didn't I get a parse error when removing the definition of Main, unexpected EOF or something similar? Note that at this point this is pretty much just a copy-and-paste exercise. Perhaps there is some problem with copying indented Any help appreciated, -- Skip Montanaro - skip@pobox.com - http://www.smontanaro.net/