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

[Anton Kholomiov]

Maybe I export State from one library version
and instance from another?

2012/6/23 Anton Kholomiov <anton.kholomiov at gmail.com>

> Indeed, thank you. mtl is cruel with me for
> the second time uumpf. But it's strange mtl
> just reexports transformer's module
>
>
>
>
> 2012/6/23 MigMit <miguelimo38 at 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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>>
>>
>
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