Is there currently a way in D2 to get the parameters of all instantiations of
a template in a given scope?  For example:
class Foo {
    template instantiateMe(T) {
        void instantiateMe(T arg) {}
    }
    void foo() {
        int i;
        instantiateMe(i);
    }
    void bar() {
        float f;
        instantiateMe(f);
    }
    alias allInstantiations!instantiateMe allArgs; // (int, float)
}