text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <tuple>
  
  // template <class... Types> class tuple;
  
  // template <class... UTypes>
  //   tuple& operator=(const tuple<UTypes...>& u);
  
  // UNSUPPORTED: c++98, c++03
  
  #include <tuple>
  #include <string>
  #include <cassert>
  
  struct B
  {
      int id_;
  
      explicit B(int i = 0) : id_(i) {}
  };
  
  struct D
      : B
  {
      explicit D(int i = 0) : B(i) {}
  };
  
  int main()
  {
      {
          typedef std::tuple<double> T0;
          typedef std::tuple<int> T1;
          T0 t0(2.5);
          T1 t1;
          t1 = t0;
          assert(std::get<0>(t1) == 2);
      }
      {
          typedef std::tuple<double, char> T0;
          typedef std::tuple<int, int> T1;
          T0 t0(2.5, 'a');
          T1 t1;
          t1 = t0;
          assert(std::get<0>(t1) == 2);
          assert(std::get<1>(t1) == int('a'));
      }
      {
          typedef std::tuple<double, char, D> T0;
          typedef std::tuple<int, int, B> T1;
          T0 t0(2.5, 'a', D(3));
          T1 t1;
          t1 = t0;
          assert(std::get<0>(t1) == 2);
          assert(std::get<1>(t1) == int('a'));
          assert(std::get<2>(t1).id_ == 3);
      }
      {
          D d(3);
          D d2(2);
          typedef std::tuple<double, char, D&> T0;
          typedef std::tuple<int, int, B&> T1;
          T0 t0(2.5, 'a', d2);
          T1 t1(1.5, 'b', d);
          t1 = t0;
          assert(std::get<0>(t1) == 2);
          assert(std::get<1>(t1) == int('a'));
          assert(std::get<2>(t1).id_ == 2);
      }
  }
  