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Compiler projects using llvm 
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s

// Note: Partial ordering of function templates containing template
// parameter packs is independent of the number of deduced arguments
// for those template parameter packs.
template<class ...> struct Tuple { }; 
template<class ... Types> int &g(Tuple<Types ...>); // #1 
template<class T1, class ... Types> float &g(Tuple<T1, Types ...>); // #2
template<class T1, class ... Types> double &g(Tuple<T1, Types& ...>); // #3

void test_g() {
  int &ir1 = g(Tuple<>()); 
  float &fr1 = g(Tuple<int, float>()); 
  double &dr1 = g(Tuple<int, float&>()); 
  double &dr2 = g(Tuple<int>());
}

template<class ... Types> int &h(int (*)(Types ...)); // #1 
template<class T1, class ... Types> float &h(int (*)(T1, Types ...)); // #2
template<class T1, class ... Types> double &h(int (*)(T1, Types& ...)); // #3

void test_h() {
  int &ir1 = h((int(*)())0); 
  float &fr1 = h((int(*)(int, float))0);
  double &dr1 = h((int(*)(int, float&))0);
  double &dr2 = h((int(*)(int))0);
}

namespace test_j {

template <int I> struct ref {};

template <int... L> void map(ref<L>...);
template <int head, int... tail> void map(ref<head> x, ref<tail>... xs); // expected-note {{here}}

template void map<0, 1>(ref<0>, ref<1>);
// expected-error@-1 {{explicit instantiation of undefined function template 'map'}}

} // namespace test_j