Thanks!
E.
David Menendez wrote:
On Thu, Sep 25, 2008 at 1:15 PM, Eric <[EMAIL PROTECTED]> wrote:
Dear all,
I've written a function with the following type:
build :: Bifunctor s => (forall b. (s a b -> b) -> b) -> Fix s a
When I try to compile I get the following error:
Illegal poly
On Thu, 25 Sep 2008, David Menendez wrote:
That looks like it should work. I'm guessing you enabled
ExistentialQuantification, but not Rank2Types or RankNTypes. The
former allows you to use the forall keyword in data declarations, but
you need one of the others to allow universal quantification
On Thu, Sep 25, 2008 at 1:15 PM, Eric <[EMAIL PROTECTED]> wrote:
> Dear all,
>
> I've written a function with the following type:
>
> build :: Bifunctor s => (forall b. (s a b -> b) -> b) -> Fix s a
>
> When I try to compile I get the following error:
>
> Illegal polymorphic or qualified type:
Dear all,
I've written a function with the following type:
build :: Bifunctor s => (forall b. (s a b -> b) -> b) -> Fix s a
When I try to compile I get the following error:
Illegal polymorphic or qualified type: forall b. (s a b -> b) -> b
In the type signature for `build':
build :: (Bifu
