Version 1.4.13 is available upstream. Please consider updating!
It seems that version 1.4.13 is available upstream, while the latest version in the Gentoo tree is 1.4.12. You think this warning is false? Read more about it here.
This library provides strict left folds that stream in constant
memory, and you can combine folds using @Applicative@ style to derive new
folds. Derived folds still traverse the container just once and are often as
efficient as hand-written folds.