template compiler error - does not refer to a value

The following code results in the compiler error 'Exception' does not refer to a value

    template <typename T>
    class A {
    public:
        virtual ~A() = 0;
        class Exception {
        };
    };

    template<typename T>
    inline A<T>::~A() {}

    template <typename T>
    class B : public A<T> {
    public:
        B() {}

        ~B() {}

        void foo() {
            throw B<T>::Exception();
        }
    };
    int main()
    {
        try {
            B<int> instB = B<int>();
            instB.foo();
        }
        catch(B<int>::Exception &e) {
            std::cout << "uh oh" << std::endl;
        }
    }

but, if the type is explicitly specified into the throw, it works. It seems there is an issue in specifying the template type.

throw B<int>::Exception   // this works

From Template compilation error: 'X' does not refer to a value this is an indicate that clang is expecting 'Exception' to be a value, not a type.

What is the proper way to thrown the template class Exception?