Version 3.1.16.1 is available upstream. Please consider updating!
It seems that version 3.1.16.1 is available upstream, while the latest version in the Gentoo tree is 3.1.14.0. You think this warning is false? Read more about it here.
Parsec is designed from scratch as an industrial-strength parser
library. It is simple, safe, well documented (on the package
homepage), has extensive libraries and good error messages,
and is also fast. It is defined as a monad transformer that can be
stacked on arbitrary monads, and it is also parametric in the
input stream type.