ekmett/lens — pull request #333 by startling (2013-09-03 05:24:14+00:00)
Title: `Data.Map.Lens', for documentation.

(re: #292.)

Open questions:

* Should it be made more clear that this module is for documentation only? I had a `{-# WARNING #-}` pragma but that put an ugly red warning in the Haddocks.
* I've added this to the exports in `lens.cabal`. Is this deceptive? It might be even more confusing otherwise.