[Haskell-cafe] Re: Comparing GADTs for Eq and Ord

[Ashley Yakeley]

Ryan Ingram wrote:

> There are many papers that talk about using GADTs to reify types in
> this fashion to allow safe typecasting.  They generally all rely on
> the "base" GADT, "TEq"; every other GADT can be defined in terms of
> TEq and existential types.

Ah, yes. See my paper "Witnesses and Open Witnesses"
<http://semantic.org/stuff/Open-Witnesses.pdf>

-- 
Ashley Yakeley