[Haskell-cafe] Data.Array.Unboxed in GHC 7.4

Tom Nielsen tanielsen at gmail.com
Tue May 22 11:41:57 CEST 2012

Dear cafe,

I have just upgraded to GHC 7.4, and now I run into some compilation
problems. Specifically, I have a package that needs both Data.Array.Unboxed
and System.IO.Unsafe. But I cannot enable both base and haskell98 in a
cabal file. is there any way out of this?

If I enable both haskell98 and base, I get

    Ambiguous module name `Prelude':
      it was found in multiple packages: base haskell98-
cabal: Error: some packages failed to install:

as documented elsewhere (http://hackage.haskell.org/trac/ghc/ticket/4958)

With haskell98 replacing base, I get

    Could not find module `System.IO.Unsafe'
    It is a member of the hidden package `base'.
    Perhaps you need to add `base' to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
cabal: Error: some packages failed to install:

and without haskell98 or array, cabal tells me to add those to .cabal

So how can I use the Data.Array.Unboxed package together with all the stuff
from base that is not in haskell98?


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