[Haskell-cafe] <**> for nested applicative functors?

Does anyone know if it's possible to write the following: <**> :: (Applicative m, Applicative n) => m (n (a->b)) -> m (n a) -> m (n b) Clearly, if m and n were monads, it would be trivial. Rereading the original paper, I didn't see much discussion about such nested app. functors. Any help appreciated. -- View this message in context: http://www.nabble.com/%3C**%3E-for-nested-applicative-functors--tp25858792p2... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.