text: // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
  // expected-no-diagnostics
  
  // Various tests related to partial ordering of variadic templates.
  template<typename ...Types> struct tuple;
  
  template<typename Tuple> 
  struct X1 {
    static const unsigned value = 0;
  };
  
  template<typename Head, typename ...Tail>
  struct X1<tuple<Head, Tail...> > {
    static const unsigned value = 1;
  };
  
  template<typename Head, typename ...Tail>
  struct X1<tuple<Head, Tail&...> > {
    static const unsigned value = 2;
  };
  
  template<typename Head, typename ...Tail>
  struct X1<tuple<Head&, Tail&...> > {
    static const unsigned value = 3;
  };
  
  int check0[X1<tuple<>>::value == 0? 1 : -1];
  int check1[X1<tuple<int>>::value == 2? 1 : -1];
  int check2[X1<tuple<int, int>>::value == 1? 1 : -1];
  int check3[X1<tuple<int, int&>>::value == 2? 1 : -1];
  int check4[X1<tuple<int&, int&>>::value == 3? 1 : -1];
  
  // Partial ordering of function templates.
  template<typename T1, typename T2, typename ...Rest>
  int &f0(T1, T2, Rest...);
  
  template<typename T1, typename T2>
  float &f0(T1, T2);
  
  void test_f0() {
    int &ir1 = f0(1, 2.0, 'a');
    float &fr1 = f0(1, 2.0);
  }
  
  template<typename T1, typename T2, typename ...Rest>
  int &f1(T1, T2, Rest...);
  
  template<typename T1, typename T2>
  float &f1(T1, T2, ...);
  
  void test_f1() {
    int &ir1 = f1(1, 2.0, 'a');
  }
  
  template<typename T1, typename T2, typename ...Rest>
  int &f2(T1, T2, Rest...);
  
  float &f2(...);
  
  void test_f2() {
    int &ir1 = f2(1, 2.0, 'a');
  }
  