transformers versus mtl

[Sittampalam, Ganesh]

Henning Thielemann wrote:
> On Sun, 15 Mar 2009, Sittampalam, Ganesh wrote:
> 
>> 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. 

Yes, so do I.

>> 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 think this makes perfect sense where the monad transformer types are
not externally visible. I'm just concerned about what to do with
packages
where the types are part of the interface - it would be best to
coordinate
this to some extent to avoid incompatibilities.

Cheers,

Ganesh


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