ekmett/lens — pull request #483 by hvr (2014-09-29 07:51:01+00:00)
Title: Avoid clash with future `Data.Foldable.null`

Albeit this approach is a bit ugly (isn't there a way to alias the
current module qualifier to something shorter?), this reduces the
line-count to a minimum and avoids the use of `CPP` :-)