transformers versus mtl

Henning Thielemann lemming at
Sun Mar 15 17:38:48 EDT 2009

On Sun, 15 Mar 2009, Sittampalam, Ganesh wrote:

> Hi,
> What are the relative status of transformers and mtl? Are we trying to
> deprecate mtl use in favour of transformers (+ appropriate dependencies
> like monads-fd)?

I have actually done this step in all of my packages.

> I see that the initial version of the Haskell Platform is planning to 
> use mtl because of its status in extralibs - but if transformers is the 
> way forward, then perhaps this should be changed?

I prefer transformers + monad-fd + monad-tf or whatever as the standard 
implementation over mtl.

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