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[Cyril Cohen <cohen AT crans.org>]

Hi,

On 17/04/2011 21:08, Vladimir Voevodsky wrote:
> Consider the following code:
> [...]
> Coq complains that  "Error: X is not a structure object.". What is then a 
> "structure object"?

I suppose it means that the fields of the structure should be
instantiated in order to be inserted into the Canonical Structure table.

Here is an example of fix :

Variable T : Type.
Variable P : T ->  Type.

Structure TP: Type := {pr1:>T ; pr2:P pr1}.

Variable p1 : T.
Variable p2 : P p1.

Canonical Structure X := {| pr1 := p1; pr2 := p2 |}.


Best Regards,
-- 
Cyril Cohen
Sorry for the duplicated reply