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- From: Enrico Tassi <enrico.tassi AT inria.fr>
- To: coq-club AT inria.fr
- Subject: Re: [Coq-Club] coercions between records
- Date: Thu, 25 Oct 2012 11:08:18 +0200
On Thu, Oct 25, 2012 at 02:10:47AM +0200,
akhirsch AT gwmail.gwu.edu
wrote:
> Record second_model : Type := {
> P : Set;
> W : Set;
> p_Eq : relation P;
> s : W -> first_model;
> coerce_p_to_d : forall (w : W), P -> D (s w)
>
> Is there a way to make this work?
The quick answer is no, not with the current version of Coq.
Here the type of the coercion is something like that:
forall (m : second_model) (w : W m), P m -> D (s (W m))
That does not validate the uniform inheritance condition.
Relaxing this condition is on my TODO list. In Coq 8.4 I changed the
error into a warning, but it will still not work as expected in this
case (for a very silly reason, but still...).
Please file a whishlist bugreport, so that I don't forget about it.
Regards
--
Enrico Tassi
- [Coq-Club] coercions between records, akhirsch, 10/25/2012
- Re: [Coq-Club] coercions between records, Enrico Tassi, 10/25/2012
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