data kinds

José Pedro Magalhães jpm at
Fri Jan 25 16:22:25 CET 2013



On Fri, Jan 25, 2013 at 3:19 PM, Ross Paterson <ross at> wrote:

> GHC implements data kinds by promoting data declarations of a certain
> restricted form, but I wonder if it would be better to have a special
> syntax for kind definitions, say
>   data kind Nat = Zero | Succ Nat
> At the moment, things get promoted whether you need them or not, and
> if you've made some mistake that makes your definition non-promotable
> you don't find out until you try to use it.
> More importantly, a separate form for kinds would allow one to use
> existing kinds, i.e. *, in definitions of new kinds.
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