MTL vs Transformers. Any status update?

Henning Thielemann lemming at
Sat Nov 28 16:17:06 EST 2009

On Sat, 28 Nov 2009, Thomas DuBuisson wrote:

> On Sat, Nov 28, 2009 at 8:56 AM, Ross Paterson <ross at> wrote:
>> The problem is that transformers and mtl use the same module names,
>> such as Control.Monad.Identity.  Unless one of these packages is hidden,
>> people using ghci or ghc --make will have problems.
> I've happily used LANGUAGE PackageImports to handle transformer / mtl
> conflicts.  I don't see why either one must change their module names
> and there are obvious disadvantages.

This PRAGMA is only available in GHC, is it?

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