Can a parameter pack be captured implicitly within C++11 lambdas?

Does anyone know if the following implicit capture of 'ts' is well-formed:

template<class ... Ts> void bar(Ts ... ts) { }

template<class ... Ts> int foo(Ts ... ts) {
    auto L = [=] () {
       bar(ts...);
    };
    L();
    return 0;
}
int g = foo(1, 2, 3);

Does the standard clearly state anywhere that this should not be well formed?