Lens does not compile with the latest vector package

[ozataman]

The newly released vector at http://hackage.haskell.org/package/vector seems to cause compile problems for lens. I get:

Preprocessing library lens-3.9.1...

src/Data/Vector/Generic/Lens.hs:38:8:
    Could not find module `Data.Vector.Fusion.Stream'
    Perhaps you meant
      Data.Vector.Fusion.Util (from vector-0.10.9.0)
      Data.Vector.Fusion.Bundle (from vector-0.10.9.0)
    Use -v to see a list of the files searched for.

Doing a cabal install 'vector < 0.10.9' seems to circumvent the problem for me.

[glguy]

Let's merge all discussion to one ticket: #340 (because this one has some commits to be discussed)