Re: [Haskell-cafe] ByteString in patterns

Am Mittwoch, 11. März 2009 17:09 schrieb Manlio Perillo:

Don Stewart ha scritto:

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manlio_perillo:

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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

Then there is something I'm missing.

A recent enough bytestring package. Compiles and works with 0.9.1.4

Your code does not compile.

Thanks Manlio Perillo

Cheers, Daniel