Resolved my problems by going after later versions of ByteString:

>cabal install bytestring-0.9.2.0

Resolving dependencies...

cabal: bytestring.cabal:70: The 'type' field is required for test suites. The

available test types are: exitcode-stdio-1.0

cabal: Error: some packages failed to install:

bytestring-0.9.2.0 failed during the configure step. The exception was:

ExitFailure 1

That did not work, but the following:

>cabal install bytestring-0.9.1.10

Resolving dependencies...

No packages to be installed. All the requested packages are already installed.

If you want to reinstall anyway then use the --reinstall flag.

tells me that I already had a working version. I was chasing the wrong problem.

Looking at my BlazeHtml code again, there were imports declared as follows:

> import Prelude hiding (head, id, div)

> import Text.Blaze.Html4.Strict as H hiding (map)

> import Text.Blaze.Html4.Strict.Attributes as A

> import Control.Monad

> import Data.Monoid (Monoid, mappend, mempty, mconcat)

> import Text.Blaze.Renderer.Utf8 (renderHtml)

>  import Data.ByteString.UTF8 as B

The last import was the problem. Something changed in the libraries to make this 'UTF8' line break. I worked around this for now.

Need to research some more, quick glance at the bytestring library versions  suggest 'Char8' not 'UTF8' .  However Data.ByteString.UTF8 is in the utf8-string-0.3 library (http://hackage.haskell.org/packages/archive/utf8-string/0.3/doc/html/Data-ByteString-UTF8.html).

So my question becomes "Can someone tell me if there are notes somewhere on the state of play of the UTF8 ByteString Libraries"

Ralph Hodgson, @ralphtq

From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of Ralph Hodgson
Sent: Saturday, October 01, 2011 8:31 PM
To: haskell-cafe@haskell.org
Subject: [Haskell-cafe] ByteString install issues with GHC 7.0.3 on Windows 7

This morning I was successfully running BlazeHtml on Windows 7. Then I installed some libraries from other packages and BlazeHtml broke.

I then decided to go from ghc 6.12.1 to ghc 7.0.3 and reinstall everything.

BlazeHtml installed OK. But my program also needed ByteString. So I did the following:

First I tried the stable version:

>cabal install bytestring-0.9.1.4

Resolving dependencies...

Configuring bytestring-0.9.1.4...

Preprocessing library bytestring-0.9.1.4...

Building bytestring-0.9.1.4...

Data\ByteString.hs:3:24:

    Cannot parse LANGUAGE pragma

    Expecting comma-separated list of language options,

    each starting with a capital letter

      E.g. {-# LANGUAGE RecordPuns, Generics #-}

cabal: Error: some packages failed to install:

bytestring-0.9.1.4 failed during the building phase. The exception was:

ExitFailure 1

I am not experienced enough to fix this, so I tried a previous ByteString version:

>cabal install bytestring-0.9.1.3

Resolving dependencies...

Configuring bytestring-0.9.1.3...

Preprocessing library bytestring-0.9.1.3...

Building bytestring-0.9.1.3...

[1 of 8] Compiling Data.ByteString.Fusion ( Data\ByteString\Fusion.hs, dist\buil

d\Data\ByteString\Fusion.o )

[2 of 8] Compiling Data.ByteString.Internal ( Data\ByteString\Internal.hs, dist\

build\Data\ByteString\Internal.o )

Data\ByteString\Internal.hs:79:42:

    Module `GHC.IOBase' does not export `RawBuffer'

cabal: Error: some packages failed to install:

bytestring-0.9.1.3 failed during the building phase. The exception was:

ExitFailure 1

No joy.

Help appreciated.

May try all this on my MAC tomorrow.

Ralph Hodgson, @ralphtq

Mobile Phone: +1 781-789-1664