For reference to anyone coming across this:
The issue is that cabal-dev does in fact depend on the old mtl, if one checks
the cabal file. (Thanks to dcoutts_ on #haskell).
The suggestion I received was to use virthualenv.
On Wed, Jun 13, 2012 at 9:20 AM, Edward Amsden
The warning in that paste occurs when I attempt $ cabal update $ cabal install cabal-dev
This is curious because it wants to install a previous version of mtl. I can't figure out why. There doesn't seem to be any dependency between cabal-dev and mtl. According to hackage, the dependencies for cabal-dev are:
cabal-dev -> (base, Cabal) Cabal -> (base, filepath) filepath -> (base) base -> ()
The dependencies for mtl are (just to show no conflicts) mtl -> (base, transformers) transformers -> (base) base -> ()
And there's not a versioning conflict with base.
Why is cabal insisting on backdating mtl then?
-- Edward Amsden Student Computer Science Rochester Institute of Technology www.edwardamsden.com