Version 1.0.15.3 is available upstream. Please consider updating!
It seems that version 1.0.15.3 is available upstream, while the latest version in the Gentoo tree is 1.0.15.1. You think this warning is false? Read more about it here.
Monomorphic variants of the Functor, Foldable, and Traversable typeclasses. Contains even more experimental code for abstracting containers and sequences.