On Sat, Jun 12, 2010 at 9:05 PM, Daniel Fischer
On Saturday 12 June 2010 21:43:25, gdweber@iue.edu wrote:
so I go on declaring in my cabal file that my package depends on P >= A.B.C, even though I *might* be using new features of P that wouldn't work with P == A.B.C.
If you're changing the code to use new features of P, you have to raise the lower bound of the dependency. If you don't use any new features, it would continue working with P-A.B.C, so you can leave the lower bound.
It's not always easy to remember or tell when you break compatibility with old versions. I came up with this idea for cabal-install to aid in development: http://hackage.haskell.org/trac/hackage/ticket/661 which I think would help, but it's not been written yet. Maybe add yourself to the CC list if you're eager to see it happen.