Gregory Crosswhite wrote: > Something that I have been wondering for a while is: why are there > *still* two monad transformer libraries with seemingly identical > functionality, especially given that they have conflicting > namespaces? It creates stupid problems like the one that Erik > encountered and had to work around. > > I recognize that this situation most likely came about via historical > accident rather than by intention, but why does it continue to be > true?
The intention is to migrate to transformers, which has a slightly better design and separates out the functional dependencies into a separate package (monads-fd), thus allowing use of the type families variant (monads-tf) instead. This has been discussed to some extent on the libraries list and a workable strategy involving making a new mtl 2.0 that re-exports transformers has been suggested. However the migration from extralibs to the Haskell Platform put the brakes on further progress for a bit. Now that this migration is essentially complete I have been intending to revive the proposal but haven't got round to it yet. Please do jump in and do so yourself if you feel motivated! Cheers, Ganesh =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html =============================================================================== _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
