On Fri, 2009-11-27 at 00:33 +0000, Ross Paterson wrote:
As I understand it, the Haskell Platform timetable means this will take some time.
I think the ultimate aim should be that everyone moves to transformers and monads-fd (probably with some renaming of modules in the latter), and mtl disappears. If we decide on that, this is we could get there:
1. rename the modules in monads-fd to their final names. (We also need suggestions for what those names should be.) 2. release mtl-2.0 as a deprecated compatibility layer over transformers and monads-fd, and get all users to hide all versions of mtl, including the new one. 19 packages on hackage must be updated to work with the new version. 3. encourage authors to upgrade their packages to depend on transformers and (possibly) monads-fd in place of mtl. 4. after a couple of cycles, remove mtl from the platform.
Could someone remind me why it's better for use to ask everyone to switch to monads-fd / transformers rather than to mtl-2? Does that make the transition easier? If it makes little difference I'd suggest making mtl-2 the new recommendation (with whatever content you've all agreed) simply because it's easier to explain to everyone else. Duncan