[Haskell-cafe] "datakind" declaration

[Ben Millwood]

On Tue, Feb 23, 2010 at 1:08 AM, Paul Brauner <paul.brauner at loria.fr> wrote:
> Hello,
>
> I remember seeing something like
>
>> typedata T = A | B
>
> somewhere, where A and B are type constructors, but I can't find it in
> the ghc doc. Have I been dreaming or is it some hidden feature ?
>
> Paul
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This is similar to what you are thinking of:

http://hackage.haskell.org/trac/ghc/wiki/KindSystem

...but it's not implemented (yet).