2012/6/23 MigMit <miguelimo38@yandex.ru>

On 23 Jun 2012, at 21:27, Anton Kholomiov wrote:

> At last..
>
> 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)

Ehm... seems like you're importing mtl instead of transformers. AFAIK there is no "Control.Monad.Trans" module in transformers.

>
> I get the error
>
> And when I'm doing
>
> import Control.Monad.Trans.Class (0.2.2.0)
>
> It compiles.
>
>
> Anton
>

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