haskell@gentoo.org Gentoo Haskell Selective applicative functors: declare your effects statically, select which to execute dynamically. This is a library for /selective applicative functors/, or just /selective functors/ for short, an abstraction between applicative functors and monads, introduced in <https://www.staff.ncl.ac.uk/andrey.mokhov/selective-functors.pdf this paper>.