interface reference not compatible to Object?

[Walter Bright]

Frank Benoit (keinfarbton) wrote:
> interface I{
>     void func();
> }
> class C : I {
>     void func(){
>     }
> }
> void main(){
>     C c = new C;
>     c.toHash(); // from class Object
>     I i = c;
>     i.toHash(); // line 14
> }
> /////////////////////////////
> t.d(14): no property 'toHash' for type 't.I'
> t.d(14): function expected before (), not 1 of type int
> 
> 
> Is this the intended behaviour? If *every* object in D is a Object, then
> every interface reference refers to an Object also.
> This said, the above should compile?

Replace:
	i.toHash();
with:
	(cast(Object)i).toHash();
and it will work, *provided* that i is actually an instance of an 
Object. If it is not, for example if it came from some COM DLL, the cast 
will fail.