generics: use of inner raw class causes verify error

From: Remi Forax <###@###.###>
>public class Outer<T> {
> class Inner<U extends Number> {
> U u;
>
> void set(U u) {
> this.u=u;
> }
> }
>
> public static void main(String[] args) {
> new Outer<Object>().new Inner().set("toto");
> }
>}
>
>In the code above, the compiler don't detect the use
>of the class Inner as a raw type. This code compile and
>raise a VerifyError during the execution.
>
>This bug doesn't appear if the class Outer isn't a generic class.