mjo authored Dec 08, 2014 and Herbert Valerio Riedel committed Dec 08, 2014

To actually *run* the doctests, you need to do a little
hacking. Somewhere after the `GHC.Base` import, you'll need to reimport
`Maybe(..)` from `Prelude`, clobbering the `GHC.Base` definition. After
that, doctest should be runnable from the `Data/` directory.

Reviewed By: austin, hvr

Differential Revision: https://phabricator.haskell.org/D561