interface not able to use functions from base classes??

[Øivind]

Why doesn't this work:

----
class A {
        int f(int x) {
                return x;
        }
}

interface I {
        int f(int x);
}

class B : A, I {
        
}

void main() {}

----

I get the following error with DMD 2.064.2:

/d122/f338.d(11): Error: class f338.B interface function 'int 
f(int x)' is not implemented