Access of a local class in a template function to a static variable

Hi,
I have the following code which compiles and runs fine on GCC 4.3.2:

//--------------------------------------------------------
struct A {virtual int getnum()=0;};

A* func(int numin) {
    static int num;
    num=numin;
    struct B : public A {
        int getnum(){
            delete this;
            return num;
        }
    };
    return new B();
}

int main() {
    func(3)->getnum();
    return 0;
}
//--------------------------------------------------------

But when I do the same thing with a templated type instead of 'int',
the code compiles but I get a link error:

//--------------------------------------------------------
template<typename T>
struct A {virtual T getnum()=0;};

template<typename T>
A<T>* func(T numin) {
    static T num;
    num=numin;
    struct B : public A<T> {
        T getnum(){
            delete this;
            return num; // <----- link error: undefined reference
to 'num'
        }
    };
    return new B();
}

int main() {
    func(3)->getnum();
    return 0;
}
//--------------------------------------------------------

Is this a compiler bug, or is this actually not supposed to work with
templates?