Re: foldable flexible bridges (putting foldable+traversable in prelude) Re: Burning bridges

On Tue, 21 May 2013, Erik Hesselink wrote:

Then you've never done this, at least not in combination with the mtl. You need at least two imports to import the generalized mapM_ etc:

import Prelude hiding (mapM_) import Data.Foldable (mapM_)

With mtl (one of the most used packages in the Haskell ecosystem, I'd guess) you additionally need:

import Control.Monad.State hiding (mapM_) import Control.Monad.Reader hiding (mapM_)

I answered to this argument to Andreas Abel. I just do not use mtl for this and other purposes. I use transformers.