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      1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
      2 
      3 template <class _Tp, class _Up, bool = false>
      4 struct __allocator_traits_rebind
      5 {
      6 };
      7 
      8 template <template <class, class...> class _Alloc, class _Tp, class ..._Args,
      9 class _Up>
     10 struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, false>
     11 {
     12    typedef _Alloc<_Up, _Args...> type;
     13 };
     14 
     15 template <class Alloc>
     16 struct allocator_traits
     17 {
     18    template <class T> using rebind_alloc = typename __allocator_traits_rebind<Alloc, T>::type;
     19    template <class T> using rebind_traits = allocator_traits<rebind_alloc<T>>;
     20 };
     21 
     22 template <class T>
     23 struct allocator {};
     24 
     25 int main()
     26 {
     27    allocator_traits<allocator<char>>::rebind_alloc<int> a;
     28 }
     29