[Haskell-beginners] Problem with installing SDL

[Julian Drube]

Thank you,

In the file `Graphics/UI/SDL/Events.hsc` I changed the line

import Data.Typeable (Typeable(typeOf),TypeRep)

to just

import Data.Typeable

and it compiles without problems now.

Julian

On Thursday 08 May 2014 17:43:41 Patrick Wheeler wrote:
> The error is saying that it can not find `typeOf` in the `Typeable` class.
>  This is because that function is not longer part of the `Typeable` in
> ghc7.8 and moving forward.  Error like this are still be sorted out for ghc
> 7.8.  You are on a bleeding edge version of ghc so packaging problems like
> this are expected.  Package stability is usually marked by when the Haskell
> Platform updates to the new ghc version.
> 
> So if you want additional stability HP is where it is at. If you want to
> live and the bleeding edge then you can download sdl with cabal unpack and
> see if you can not fix the problem for yourself.
> 
> Here is a link to the `Typeable` module in base:
> http://hackage.haskell.org/package/base-4.7.0.0/docs/Data-Typeable.htmlOf
> 
> There is replacement function for backward compatibility.
> http://hackage.haskell.org/package/base-4.7.0.0/docs/Data-Typeable.html#v:ty
> peOf
> 
> If you fixed the import statement for all of the sdl modules, you might fix
> the incompatibility with the new Typeable.  There will probably be a few
> other issues that need solving after this one. I have updated several
> packages on a case by case basis when I need them to new ghc version and
> has been a lesson in understanding ghc errors and fixing them. If you have
> the time I recommend giving it a shot.
> 
> Patrick