Re: [Haskell-cafe] ByteString in patterns

10 Mar 2009


      manlio_perillo:
...
Don Stewart ha scritto:
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[...]
    {-# LANGUAGE OverloadedStrings #-}
import qualified Data.ByteString.Char8 as C
isMatch :: C.ByteString -> Bool
    isMatch "match" = True
    isMatch _       = False
main = print . map isMatch . C.lines =<< C.getContents
What is the reason why instance declarations for IsString class are not  
defined for available ByteStrings?
I need to define it by myself.
They're exported from Data.ByteString.Char8