Thank you, that was the trick! It would be handy it there was a way through the online hackage packages pages to click through the dependencies. I guess you checked the .cabal by hand or used some slightly more arcane cabal commands to get that information.

Thank you again and nice rest of week-end!

Emmanuel

On Sun, Mar 17, 2013 at 2:51 PM, Andres Löh <andres@well-typed.com> wrote:

Hi again.

> thank you for the tip! It helps but it's not quite there yet. If you see
> the program in attachment, I can make it compile only by commenting the type
> declaration for the second function, otherwise it's the exact same error
> message as before.

You're probably using the wrong HashMap. There are several packages on
Hackage implementing similarly-named data structures (which is
confusing, I know, but such is life in a decentralized and open
world). You should use what aeson is using (because that's the library
defining the Object type synonym).

Looking at the import list of

http://hackage.haskell.org/packages/archive/aeson/0.6.0.2/doc/html/src/Data-Aeson-Types-Internal.html

we see

import Data.HashMap.Strict (HashMap)

and by checking the package dependencies of aeson, we figure out that
this module is provided by the unordered-containers package.

Cheers,
Andres

--
Andres Löh, Haskell Consultant
Well-Typed LLP, http://www.well-typed.com

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