See you at JVMLS

[Palo Marton]

>
>
>
> class C {
>     int x;
> }
>
> interface I extends C {
> }
>
> class D {
>     int x;
> }
>
> interface J extends D {
> }
>
> class E implements I, J {
> }
>

This would be a compile time (or JVM link time) error as this interface
extends 2 classes.