G'day all.
Quoting John Meacham
Ack. I use the MTL quite extensivly in most of my projects. I hope it won't disapear from the standard libraries completely.
For the record, I have no information that the MTL will disappear any time soon. However, the proposed roadmap is to move stuff out of hslibs and into cabal, and that may be the eventual fate of the MTL, especially if someone proposes something better for future standardisation. My real point in all this is that using a state monad for the purpose proposed in the number theory library is (IMO) overkill, despite making the code slightly prettier, and introduces dependencies which don't need to be there. My real real point is that the rules for libraries are slightly different than the rules for programs. Cheers, Andrew Bromage