Version 0.21.1 is available upstream. Please consider updating!
It seems that version 0.21.1 is available upstream, while the latest version in the Gentoo tree is 0.20.0. You think this warning is false? Read more about it here.
The doctest program checks examples in source code comments.
It is modeled after doctest for Python
(<http://docs.python.org/library/doctest.html>).
Documentation is at
<https://github.com/sol/doctest-haskell#readme>.