[Haskell-cafe] Can it be proven there are no intermediate "useful" type classes between Applicative Functors & Monads?

Ben Lippmeier benl at ouroborus.net
Mon Jun 6 05:11:37 CEST 2011

On 06/06/2011, at 5:51 , KC wrote:

> If new intermediate classes crop up then there would be no point in fixing
> class (Applicative m) => Monad m where
> since it would have to be changed if new intermediate classes are found.
> I realize non-existence proofs are hard.

Not as hard as formalising "useful".


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