On Fri, Mar 27, 2015 at 7:27 AM, Edward Kmett <ekmett@gmail.com> wrote:
The lens package (alongside every other package I maintain that is incurred as a dependency of lens) has very 
deliberately support all Haskell Platform releases for at least 3 current major GHC releases, often at great expense to the API.

No offense, but I don't think lens is the culprit here.

Excellent! None taken. I appologize for my poor choice of example.

Several people have included lens in an example of "newcomers want to install x, y, and z - and it won't work with the platform." It is great that lens is not the problem - but it does underscore that the other packages haven't seen fit to match the same stability release points as lens - hence the unlikeliness of them working together except at HEAD.