sunlight checks your Cabalized package and ensures that it actually
builds and passes its tests, even against mulitple dependency
versions specified in your Cabal file. For example, your Cabal file
might say that your package builds against base-4.5.1.0
and base-4.6.0.1. With
sunlight you can automatically verify that this is actually the case.
For more information, please see
http://www.github.com/massysett/sunlight