3 template<class _T1, class _T2> struct pair { };
4 template <class T0, class T1> struct tuple {
5 template <class U1, class U2>
6 tuple& operator=(const pair<U1, U2>& k) { }
8 template<class T1, class T2> inline tuple<T1&, T2&> tie(T1& t1, T2& t2) { }
10 template <class T> struct A
18 typedef A<int>::type type;
20 tie(begin1, end1) = a.f();