Adding Applicative/Functor instances to all Monads in GHC

[wren ng thornton]

On 5/16/13 7:33 AM, David Luposchainsky wrote:
> I recently went through GHC's source, and discovered there are quite a
> few instances of Monad that don't have Functor or Applicative instances.
> Fixing this is very easy by adding the standard instances (pure = return
> etc.), and will not break code.

+1.

If there're obviously superior definitions then those should be used
instead, of course.

-- 
Live well,
~wren