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