[Haskell-cafe] Problems on installing sizes-types package

[Rodrigo Ribeiro]

Hello to all!

I'm trying to install the sized-types package, a dependency for kansas lava:

http://hackage.haskell.org/package/sized-types

using cabal, and the following error message is returned:

Data/Sized/Sparse/Matrix.hs:61:26:
    Could not deduce (Eq a) arising from a use of `prune'
    from the context (Size m, Size n, Size m', Size n', n ~ m', Num a)
      bound by the type signature for
                 mm :: (Size m, Size n, Size m', Size n', n ~ m', Num a) =>
                       Matrix (m, n) a -> Matrix (m', n') a -> Matrix (m,
n') a
      at Data/Sized/Sparse/Matrix.hs:50:7-112

Is it a known issue? Is there some way to solve it? I'm using GHC 7.6.3 and
plataform 2013.2.0.0.

Best,

Rodrigo
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