[Haskell-cafe] transformers problem: Could not deduce MonadTrans (StateT s) ??

[Anton Kholomiov]

No, it wants me to define an instance for
(StateT s) which is supposed to be defined
be the authors of the library.

Actually I discovered that I have two libraries
called transformers.

   transformers-0.2.2.0
   transformers-0.3.0.0

So when I'm doing

import Control.Monad.Trans (0.2.2.0)

I get the error

And when I'm doing

import Control.Monad.Trans.Class (0.3.0.0)

It compiles.


Anton
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