Could iteratee depend on mtl instead of transformers?

[Henning Thielemann]

On Tue, 17 Nov 2009, Valery V. Vorotyntsev wrote:

> Is there a way to tell GHCi ``Take Control.Monad.Trans from mtl
> package for this session'' or ``Use transformers this time'' without
> updating ghc-pkg config file (hide/expose)?
>
> If there is none, do you think inventing one would be a good idea?

With 'ghc-pkg hide' and 'expose' you can set your general preference. With 
'-hide-package mtl' and '-package transformers' you can choose per 
invokation of GHCi.