Stephen Tetley wrote: > Hi Evan > > Singleton (aka wrap) would be nice - isn't it called Pointed in the > typeclassopedia but not otherwise existent? I suppose its missing by > historical accident rather than design. > > I frequently use Semigroup (append but no zero) - there is one on > Hackage without any instances: > http://hackage.haskell.org/package/algebra > I do too. I also wish there was an associative: class F f where k :: f a -> f a -> f a without the zero component.
-- Tony Morris http://tmorris.net/ _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
