Hi
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)
Asking hoogle about rank-2 types won't get you very far, the
development version of Hoogle gives a warning that it ignores
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 proc
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 functio
At the risk of seeming terribly naive, I'm going to go ahead and share
my intuition.
Would not any function of type (forall a. a -> b) be a constant
function in b? If the function is allowed no inspection of its
argument, it must not depend on its argument.
The same intuition could be applied to
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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
> around. So, can someone find a term that inhabits
> (forall a. a -> b) -> (forall 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 cha
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 funct
