[Haskell-cafe] question regarding Data.Array.Accelerate

[Philipp]

Hi,

I have read the papers about the accelerate package that provides a
high-level interface to nvidia's cuda library and am very intrigued. 
However, I have some start-up problems.  Is this the right place for such
questions?

In particular, I'm having trouble with lifting and unlifting.  From what I
understood, I should be able to use unlift to get an Int from an Exp (Plain
Int), but when I try, for example,

(unlift . lift) (1::Int) :: Int

ghci complains with 

"No instance for (Unlift Int)".

I have the latest versions of accelerate (accelerate-0.9.0.1) and ghc
(version 7.4.1).

I think I'm missing something obvious, so if any of you could point it out
to me I would be glad.

Thanks,
Philipp

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