Henning Thielemann wrote:
On Sat, 21 Mar 2009, Ross Paterson wrote:
Are there any problems with adding transformers and monads-fd to extralibs pending the Haskell Platform being ready?
That should work, but that wouldn't be till September/October. I'm not sure what the HP schedule is. Another possibility is to upload mtl-2.0 as a compatibility layer.
We already found out, that compatibility to mtl cannot be achieved with a package based on transformers.
Can you elaborate on this or point me at the past discussion? I can't find anything from a quick look through the archives, apart from the issue that haddock will go wrong if mtl just re-exports things from transformers.
So why shall we rewrite mtl in terms of transformers+monad-fd at all? I welcome advertising transformers+transformers+monad-fd, but I don't see the benefits of breaking mtl.
If we don't make mtl and transformers use the same types, we will have some packages with interfaces that use one and some with interfaces that use the other for quite a long time to come. Also, if mtl stays in extralibs/the Haskell Platform but remains incompatible with transformers, then it will be in some way blessed which will hinder a move to transformers, but if we suddenly remove it then a lot of people will suddenly have to go and find it from hackage when previously they got it with GHC. Ganesh =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================