opIndex overload for slice not working...

[Enjoys Math via Digitalmars-d-learn]

class V(T) {
public:
   this() {}
   V opIndex(size_t i, size_t j) {
     writeln("Hello, foo!");
     return this;
   }
}

main() {
   auto v = new V!int();
   auto u = v[3..4];        // ERROR
}

Error:
no [] operator overload for type the_module.V!int