ekmett/lens — pull request #334 by startling (2013-09-03 06:21:06+00:00)
Title: Made `Data.Map.Lens' work nicely with -Werror.

It [didn't like](https://travis-ci.org/ekmett/lens/builds/10920193) the extraneous imports; I removed the imports, changed the cross-references to be absolute, and added a `$setup` for doctest.