Since my last query was answered so quickly, let's try another.
I have looked on Hoogle. I would have asked Djinn, but I don't have it
around. So, can someone find a term that inhabits
(forall a. a - b) - (forall a. m a - m b)
? I think of this as the type of functions that, given a
On Tue, Feb 27, 2007 at 06:01:44PM -0500, Jacques Carette wrote:
Since my last query was answered so quickly, let's try another.
I have looked on Hoogle. I would have asked Djinn, but I don't have it
No you couldn't. Djinn doesn't support rank2 types. (FWIW you can go to
#haskell at
The type doesn't actually indicate that the type m supports a return
operation. I introduced the qualifier that it was a functor. You
implicity introduced the constraint that it is a monad (actually a
pointed functor, but that's a Monad's return operator). With that
constraint, your thought
