That, and a motivation/design-comparison with catch. From the readme, and a quick look - I couldn't really tell how this improves on catch, except for compile times (presumably mostly in the case where the lib generates main, as factoring this out is recommended for catch).
[ed: catch provides both bdd and tdd forms of tests, while this doesn't help lift comments up to the level of tests, unlike its python inspiration - which is understandable, but a bit confusing, given the name.]
