[Haskell-cafe] Different ByteString types

[Henk-Jan van Tuyl]

L.S.,

I hope someone can help me with the following:
I am trying to check the SHA1 hash of a file, using the package cryptohash  
[0]; the following error message is displayed when I try to compile my  
program:

SHA1check.lhs:35:32:
     Couldn't match expected type `B.ByteString'
            against inferred type `Data.ByteString.Internal.ByteString'
     In the second argument of `(.)', namely `hashlazy'
     In the second argument of `(.)', namely `B.unpack . hashlazy'
     In the first argument of `(<$>)', namely
         `show . B.unpack . hashlazy'

The relevant lines of code are:
> import qualified Data.ByteString.Lazy as B
> import           Data.CryptoHash.SHA1  ( hashlazy )

>     hash <- show . B.unpack . hashlazy <$> B.hGetContents h

There is only one version of the bytestring package installed.

Details:
  - Windows XP
  - bytestring-0.9.1.7
  - cryptohash-0.5.1
  - Haskell Platform 2010.2.0.0

Regards,
Henk-Jan van Tuyl

P.S. A patch is needed if you want to install cryptohash with MinGW


[0] http://hackage.haskell.org/package/cryptohash


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