On 25 Nov 2010 at 23:48:27, Ross Paterson wrote:
On Fri, Nov 26, 2010 at 12:24:26AM +0100, Bas van Dijk wrote:
Maybe it helps if special-functors gets an upper bound on its mtl dependency: mtl < 2.
It should have mtl < 1.1.1.0, because that version lacks one of the instances it relies on.
Well, that certainly breaks the dependency loop, but still leaves the overall fetch broken. <log> C:\Source\Haskell\Wrapper>cabal fetch mtl-2.0.0.0 Resolving dependencies... cabal: cannot configure special-functors-1.0.0.1. It requires mtl >=1.0 && <1.1.1 For the dependency on mtl >=1.0 && <1.1.1 there are these packages: mtl-1.0, mtl-1.1.0.0, mtl-1.1.0.1 and mtl-1.1.0.2. However none of them are available. mtl-1.0 was excluded because mtl-2.0.0.0 was selected instead mtl-1.0 was excluded because of the top level dependency mtl ==2.0.0.0 mtl-1.1.0.0 was excluded because mtl-2.0.0.0 was selected instead mtl-1.1.0.0 was excluded because of the top level dependency mtl ==2.0.0.0 mtl-1.1.0.1 was excluded because mtl-2.0.0.0 was selected instead mtl-1.1.0.1 was excluded because of the top level dependency mtl ==2.0.0.0 mtl-1.1.0.2 was excluded because mtl-2.0.0.0 was selected instead mtl-1.1.0.2 was excluded because of the top level dependency mtl ==2.0.0.0 </log> I've tried installing transformers-0.2.2.0, but that doesn't seem to help either. Ah, but running with --verbose=3 shows that it's using the 6.4.1 version of ghc- pkg, which doesn't have transformers-0.2.2.0 installed, and if it did would have the dependency on special-functors. I'm fairly sure I've got a pre-built cabal command-line binary, the 6.12.3 version of ghc-pkg is first on the PATH, and there's nothing relevant in ~/cabal/config (I'm on Windows, but we all know what I mean by that). So where's it getting the 6.4.1 ghc-pkg from? I've tried overriding --with-hc-pkg=..., but it's an unrecognized option. -- Iain Alexander ia@stryx.demon.co.uk