[Haskell-beginners] IO operations

[Alexander Chen]

Hi,

module Main where

allwords :: IO Int
allwords  = do
    dict <- readFile "data/dict.txt"
    return  $ length [x | x <- dict , not $ '-' `elem` x]
    
main :: IO Int
main = do allwords

error

* Couldn't match expected type `t0 Char' with actual type `Char'
* In the second argument of `elem', namely `x'
  In the second argument of `($)', namely '-' `elem` x
  In the expression: not $ '-' `elem` x

could someone tell me what I am doing wrong?

thanks!
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