Re: [Haskell-cafe] transformers problem: Could not deduce MonadTrans (StateT s) ??
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
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) I get the error And when I'm doing import Control.Monad.Trans.Class (0.2.2.0) It compiles. Anton
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
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
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
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
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Maybe I export State from one library version
and instance from another?
2012/6/23 Anton Kholomiov
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
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
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
participants (2)
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Anton Kholomiov -
MigMit