Re: [Haskell-cafe] printing a list of directories which don't exist

[Henning Thielemann]

On Wed, 14 May 2008, Mike Jarmy wrote:

Newbie question:  Given a list of type '[FilePath]', how do I create a list
of all those directories which do not actually exist, and then print the
list?  I've figured out how to extract the ones which *do* exist, like so:

module Main where

import Control.Monad (filterM)
import System.Directory (doesDirectoryExist)
import System.Environment (getArgs)

main :: IO ()
main = do
   dirs <- getArgs
   let existing = filterM doesDirectoryExist dirs

should be

   existing <- filterM doesDirectoryExist dirs

I think.
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