Hmm... I think I may be using a different version of transformers than you.. I modified jhc to not rely on any particular monad Either instance, will post the fix to the repo shortly. John On Sun, Jan 29, 2012 at 2:41 AM, wren ng thornton wrote:

Hello,

I just tried building 0.7.8 today and got this error:

src/Util/ContextMonad.hs:15:9:    Overlapping instances for Error [String]      arising from the superclasses of an instance declaration                   at src/Util/ContextMonad.hs:15:9-45    Matching instances:      instance (transformers-0.2.1.0:Control.Monad.Trans.Error.ErrorList                  a) =>               Error [a]        -- Defined in transformers-0.2.1.0:Control.Monad.Trans.Error      instance [overlap ok] Error [String]        -- Defined at src/Util/ContextMonad.hs:10:9-22    In the instance declaration for `ContextMonad                                       String (Either [String])'

Let me know if you need any more info.

-- Live well, ~wren

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