MaybeT to transformers

Henning Thielemann lemming at
Thu Feb 12 09:17:04 EST 2009

On Fri, 6 Feb 2009, Sittampalam, Ganesh wrote:

> I tend to agree that this is the right one to use, but I think care
> should be taken when adding this to what is/is expected to be a widely
> used package, as it could make it difficult for people who want the
> alternate behaviour, and it might imply a degree of standardisation/
> canonicity that is not really justified.
> On the other hand, perhaps there are no real uses for the other one.

I guess the other one is simply
   liftM2 mplus
  on (m (Maybe a)) and thus there would not be much advantage of using 
(MaybeT m) instead of (m (Maybe a)).

More information about the Libraries mailing list