[Haskell-cafe] Trouble installing FileManipCompat

[Tony Miller]

Thanks that works, but I have packages that rely on mtl>=2.0, so its
not the best solution. Perhaps the maintainer of FileManipCompat could
be contacted to update the package?

On 1/4/11, Daniel Fischer <daniel.is.fischer at googlemail.com> wrote:
> On Wednesday 05 January 2011 01:54:36, Tony Miller wrote:
>> Hi,
>>
>> I'm trying to install FileManipCompat(well, really
>> HStringTemplateHelpers, but the error is from FileManipCompat) and I'm
>> getting this error:
>>
>> [1 of 1] Compiling System.FilePath.FindCompat (
>> System/FilePath/FindCompat.hs, dist/build/System/FilePath/FindCompat.o
>> )
>>
>> System/FilePath/FindCompat.hs:175:20:
>>     Not in scope: data constructor `State'
>
> Apparently the code is written for an older version of mtl.
> As of mtl-2.*, State is no longer a separate type, it's a type synonym for
>
> StateT s Identity
>
> now.
>
> You can try
>
> $ cabal install --constraint="mtl < 2.0" HStringTemplateHelpers
>
> (although having multiple versions of mtl installed may lead to some
> headaches too).
>
>
>