[Haskell-cafe] Re: Kleisli composition operator
roly.perera at dynamicaspects.org
Sun Aug 3 10:52:25 EDT 2008
> I'm obviously missing something basic here but I don't seem to be able to use
> the >=> operator which is apparently defined in the Prelude and also in
Sorry, I wasn't very clear in my original posting. What I meant to say is that
the compiler seems to be unable to find a definition of >=>. I get the message:
Not in scope: `>=>'
My understanding is that I shouldn't need to import this at all by default, and
that importing Control.Monad should also pick it up.
> My imports are:
> import Prelude hiding (abs, lookup, init)
> import Data.Maybe
> import Data.List as List hiding (lookup, insert, delete, union, init)
> import Data.Map as Map hiding (update, delete, union, null, findIndex)
> import qualified Data.Tree as Tree
> import Control.Monad
> import Control.Monad.State
> Any suggestions anyone?
> Roly Perera
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