package:universe-base

A class for finite and recursively enumerable types. A class for finite and recursively enumerable types and some helper functions for enumerating them.

class Universe a where universe :: [a]
class Universe a => Finite a where universeF :: [a]; universeF = universe

This is slim package definiting only the type-classes and instances for types in GHC boot libraries. For more instances check universe-instances-* packages.