// { dg-do compile }
// { dg-options "-fgnu-tm -O0"}
// { dg-additional-options "-Wno-return-type" }

namespace std __attribute__ ((__visibility__ ("default"))) {
  template<class _T1, class _T2>
    struct pair
    {
      typedef _T1 first_type;
      typedef _T2 second_type;
      _T1 first;
      _T2 second;
      pair()
      : first(), second() { }
      pair(const _T1& __a, const _T2& __b)
      : first(__a), second(__b) { }
    };
}


typedef long int ptrdiff_t;
typedef __SIZE_TYPE__ size_t;
namespace std __attribute__ ((__visibility__ ("default"))) {
  using ::ptrdiff_t;
  using ::size_t;
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  struct input_iterator_tag { };
  struct output_iterator_tag { };
  struct forward_iterator_tag : public input_iterator_tag { };
  struct bidirectional_iterator_tag : public forward_iterator_tag { };
  struct random_access_iterator_tag : public bidirectional_iterator_tag { };
  template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
	   typename _Pointer = _Tp*, typename _Reference = _Tp&>
    struct iterator
    {
      typedef _Category iterator_category;
      typedef _Tp value_type;
      typedef _Distance difference_type;
      typedef _Pointer pointer;
      typedef _Reference reference;
    };
  template<typename _Iterator>
    struct iterator_traits
    {
      typedef typename _Iterator::iterator_category iterator_category;
      typedef typename _Iterator::value_type value_type;
      typedef typename _Iterator::difference_type difference_type;
      typedef typename _Iterator::pointer pointer;
      typedef typename _Iterator::reference reference;
    };
  template<typename _Tp>
    struct iterator_traits<_Tp*>
    {
      typedef random_access_iterator_tag iterator_category;
      typedef _Tp value_type;
      typedef ptrdiff_t difference_type;
      typedef _Tp* pointer;
      typedef _Tp& reference;
    };
  template<typename _Tp>
    struct iterator_traits<const _Tp*>
    {
      typedef random_access_iterator_tag iterator_category;
      typedef _Tp value_type;
      typedef ptrdiff_t difference_type;
      typedef const _Tp* pointer;
      typedef const _Tp& reference;
    };
  template<typename _Iter>
    inline typename iterator_traits<_Iter>::iterator_category
    __iterator_category(const _Iter&)
    { return typename iterator_traits<_Iter>::iterator_category(); }
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  template<typename _Iterator>
    class reverse_iterator
    : public iterator<typename iterator_traits<_Iterator>::iterator_category,
	typename iterator_traits<_Iterator>::value_type,
	typename iterator_traits<_Iterator>::difference_type,
	typename iterator_traits<_Iterator>::pointer,
		      typename iterator_traits<_Iterator>::reference>
    {
    protected:
      _Iterator current;
      typedef iterator_traits<_Iterator> __traits_type;
    public:
      typedef _Iterator iterator_type;
      typedef typename __traits_type::difference_type difference_type;
      typedef typename __traits_type::pointer pointer;
      typedef typename __traits_type::reference reference;
      reverse_iterator() : current() { }
      explicit
      reverse_iterator(iterator_type __x) : current(__x) { }
      reverse_iterator(const reverse_iterator& __x)
      : current(__x.current) { }
      template<typename _Iter>
	reverse_iterator(const reverse_iterator<_Iter>& __x)
 : current(__x.base()) { }
      iterator_type
      base() const
      { return current; }
      reference
      operator*() const
      {
 _Iterator __tmp = current;
 return *--__tmp;
      }
      pointer
      operator->() const
      { return &(operator*()); }
      reverse_iterator&
      operator++()
      {
 --current;
 return *this;
      }
      reverse_iterator
      operator++(int)
      {
 reverse_iterator __tmp = *this;
 --current;
 return __tmp;
      }
      reverse_iterator&
      operator--()
      {
 ++current;
 return *this;
      }
      reverse_iterator
      operator--(int)
      {
 reverse_iterator __tmp = *this;
 ++current;
 return __tmp;
      }
      reverse_iterator
      operator+(difference_type __n) const
      { return reverse_iterator(current - __n); }
      reverse_iterator&
      operator+=(difference_type __n)
      {
 current -= __n;
 return *this;
      }
      reverse_iterator
      operator-(difference_type __n) const
      { return reverse_iterator(current + __n); }
      reverse_iterator&
      operator-=(difference_type __n)
      {
 current += __n;
 return *this;
      }
      reference
      operator[](difference_type __n) const
      { return *(*this + __n); }
    };
}


extern "C++" {
namespace std
{
  class exception
  {
  public:
    exception() throw() { }
    virtual ~exception() throw();
    virtual const char* what() const throw();
  };
  class bad_exception : public exception
  {
  public:
    bad_exception() throw() { }
    virtual ~bad_exception() throw();
    virtual const char* what() const throw();
  };
  typedef void (*terminate_handler) ();
  typedef void (*unexpected_handler) ();
  terminate_handler set_terminate(terminate_handler) throw();
  void terminate() throw() __attribute__ ((__noreturn__));
  unexpected_handler set_unexpected(unexpected_handler) throw();
  void unexpected() __attribute__ ((__noreturn__));
  bool uncaught_exception() throw() __attribute__ ((__pure__));
}
namespace __gnu_cxx __attribute__ ((__visibility__ ("default"))) {
  void __verbose_terminate_handler();
}
}
extern "C++" {
namespace std
{
  class bad_alloc : public exception
  {
  public:
    bad_alloc() throw() { }
    virtual ~bad_alloc() throw();
    virtual const char* what() const throw();
  };
  struct nothrow_t { };
  extern const nothrow_t nothrow;
  typedef void (*new_handler)();
  new_handler set_new_handler(new_handler) throw();
}

void* operator new(std::size_t, const std::nothrow_t&) throw();
void* operator new[](std::size_t, const std::nothrow_t&) throw();
void operator delete(void*, const std::nothrow_t&) throw();
void operator delete[](void*, const std::nothrow_t&) throw();
inline void* operator new(std::size_t, void* __p) throw() { return __p; }
inline void* operator new[](std::size_t, void* __p) throw() { return __p; }
inline void operator delete (void*, void*) throw() { }
inline void operator delete[](void*, void*) throw() { }
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  void
  __throw_bad_exception(void) __attribute__((__noreturn__));
  __attribute__((transaction_safe))
  void
  __throw_bad_alloc(void) __attribute__((__noreturn__));
  void
  __throw_bad_cast(void) __attribute__((__noreturn__));
  void
  __throw_bad_typeid(void) __attribute__((__noreturn__));
  void
  __throw_logic_error(const char*) __attribute__((__noreturn__));
  void
  __throw_domain_error(const char*) __attribute__((__noreturn__));
  void
  __throw_invalid_argument(const char*) __attribute__((__noreturn__));
  void
  __throw_length_error(const char*) __attribute__((__noreturn__));
  void
  __throw_out_of_range(const char*) __attribute__((__noreturn__));
  void
  __throw_runtime_error(const char*) __attribute__((__noreturn__));
  void
  __throw_range_error(const char*) __attribute__((__noreturn__));
  void
  __throw_overflow_error(const char*) __attribute__((__noreturn__));
  void
  __throw_underflow_error(const char*) __attribute__((__noreturn__));
  void
  __throw_ios_failure(const char*) __attribute__((__noreturn__));
  void
  __throw_system_error(int) __attribute__((__noreturn__));
  void
  __throw_future_error(int) __attribute__((__noreturn__));
  void
  __throw_bad_function_call() __attribute__((__noreturn__));
}


namespace std __attribute__ ((__visibility__ ("default"))) {
  template<typename _Tp>
    inline void
    swap(_Tp& __a, _Tp& __b)
    {

      _Tp __tmp = (__a);
      __a = (__b);
      __b = (__tmp);
    }
  template<typename _Tp, size_t _Nm>
    inline void
    swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
    {
      for (size_t __n = 0; __n < _Nm; ++__n)
 swap(__a[__n], __b[__n]);
    }
}
namespace __gnu_cxx __attribute__ ((__visibility__ ("default"))) {
  using std::size_t;
  using std::ptrdiff_t;
  template<typename _Tp>
    class new_allocator
    {
    public:
      typedef size_t size_type;
      typedef ptrdiff_t difference_type;
      typedef _Tp* pointer;
      typedef const _Tp* const_pointer;
      typedef _Tp& reference;
      typedef const _Tp& const_reference;
      typedef _Tp value_type;
      template<typename _Tp1>
	struct rebind
	{ typedef new_allocator<_Tp1> other; };
      new_allocator() throw() { }
      new_allocator(const new_allocator&) throw() { }
      template<typename _Tp1>
	new_allocator(const new_allocator<_Tp1>&) throw() { }
      ~new_allocator() throw() { }
      pointer
      address(reference __x) const { return &__x; }
      const_pointer
      address(const_reference __x) const { return &__x; }
      __attribute__((transaction_safe))
      pointer
      allocate(size_type __n, const void* = 0)
      {
 if (__n > this->max_size())
   std::__throw_bad_alloc();
 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
      }
__attribute__((transaction_safe))
void
      deallocate(pointer __p, size_type)
      { ::operator delete(__p); }
      size_type
      max_size() const throw()
      { return size_t(-1) / sizeof(_Tp); }
      void
      construct(pointer __p, const _Tp& __val)
      { ::new((void *)__p) _Tp(__val); }
      void
      destroy(pointer __p) { __p->~_Tp(); }
    };
  template<typename _Tp>
    inline bool
    operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
    { return true; }
  template<typename _Tp>
    inline bool
    operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
    { return false; }
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  template<typename _Tp>
    class allocator;
  template<>
    class allocator<void>
    {
    public:
      typedef size_t size_type;
      typedef ptrdiff_t difference_type;
      typedef void* pointer;
      typedef const void* const_pointer;
      typedef void value_type;
      template<typename _Tp1>
	struct rebind
	{ typedef allocator<_Tp1> other; };
    };
  template<typename _Tp>
    class allocator: public __gnu_cxx::new_allocator<_Tp>
    {
   public:
      typedef size_t size_type;
      typedef ptrdiff_t difference_type;
      typedef _Tp* pointer;
      typedef const _Tp* const_pointer;
      typedef _Tp& reference;
      typedef const _Tp& const_reference;
      typedef _Tp value_type;
      template<typename _Tp1>
	struct rebind
	{ typedef allocator<_Tp1> other; };
      allocator() throw() { }
      allocator(const allocator& __a) throw()
      : __gnu_cxx::new_allocator<_Tp>(__a) { }
      template<typename _Tp1>
	allocator(const allocator<_Tp1>&) throw() { }
      ~allocator() throw() { }
    };
  template<typename _T1, typename _T2>
    inline bool
    operator==(const allocator<_T1>&, const allocator<_T2>&)
    { return true; }
  template<typename _Tp>
    inline bool
    operator==(const allocator<_Tp>&, const allocator<_Tp>&)
    { return true; }
  template<typename _T1, typename _T2>
    inline bool
    operator!=(const allocator<_T1>&, const allocator<_T2>&)
    { return false; }
  template<typename _Tp>
    inline bool
    operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
    { return false; }
  //extern template class allocator<char>;
  //  extern template class allocator<wchar_t>;
  template<typename _Alloc, bool = __is_empty(_Alloc)>
    struct __alloc_swap
    { static void _S_do_it(_Alloc&, _Alloc&) { } };
  template<typename _Alloc>
    struct __alloc_swap<_Alloc, false>
    {
      static void
      _S_do_it(_Alloc& __one, _Alloc& __two)
      {
 if (__one != __two)
   swap(__one, __two);
      }
    };
  template<typename _Alloc, bool = __is_empty(_Alloc)>
    struct __alloc_neq
    {
      static bool
      _S_do_it(const _Alloc&, const _Alloc&)
      { return false; }
    };
  template<typename _Alloc>
    struct __alloc_neq<_Alloc, false>
    {
      static bool
      _S_do_it(const _Alloc& __one, const _Alloc& __two)
      { return __one != __two; }
    };
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  template<typename _Arg, typename _Result>
    struct unary_function
    {
      typedef _Arg argument_type;
      typedef _Result result_type;
    };
  template<typename _Arg1, typename _Arg2, typename _Result>
    struct binary_function
    {
      typedef _Arg1 first_argument_type;
      typedef _Arg2 second_argument_type;
      typedef _Result result_type;
    };
  template<typename _Tp>
    struct equal_to : public binary_function<_Tp, _Tp, bool>
    {
      bool
      operator()(const _Tp& __x, const _Tp& __y) const
      { return __x == __y; }
    };
  template<typename _Tp>
    struct not_equal_to : public binary_function<_Tp, _Tp, bool>
    {
      bool
      operator()(const _Tp& __x, const _Tp& __y) const
      { return __x != __y; }
    };
  template<typename _Tp>
    struct greater : public binary_function<_Tp, _Tp, bool>
    {
      bool
      operator()(const _Tp& __x, const _Tp& __y) const
      { return __x > __y; }
    };
  template<typename _Tp>
    struct less : public binary_function<_Tp, _Tp, bool>
    {
      bool
      operator()(const _Tp& __x, const _Tp& __y) const
      { return __x < __y; }
    };
  template<typename _Tp>
    struct _Identity : public unary_function<_Tp,_Tp>
    {
      _Tp&
      operator()(_Tp& __x) const
      { return __x; }
      const _Tp&
      operator()(const _Tp& __x) const
      { return __x; }
    };
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  enum _Rb_tree_color { _S_red = false, _S_black = true };
  struct _Rb_tree_node_base
  {
    typedef _Rb_tree_node_base* _Base_ptr;
    typedef const _Rb_tree_node_base* _Const_Base_ptr;
    _Rb_tree_color _M_color;
    _Base_ptr _M_parent;
    _Base_ptr _M_left;
    _Base_ptr _M_right;
    static _Base_ptr
    _S_minimum(_Base_ptr __x)
    {
      while (__x->_M_left != 0) __x = __x->_M_left;
      return __x;
    }
    static _Const_Base_ptr
    _S_minimum(_Const_Base_ptr __x)
    {
      while (__x->_M_left != 0) __x = __x->_M_left;
      return __x;
    }
    static _Base_ptr
    _S_maximum(_Base_ptr __x)
    {
      while (__x->_M_right != 0) __x = __x->_M_right;
      return __x;
    }
    static _Const_Base_ptr
    _S_maximum(_Const_Base_ptr __x)
    {
      while (__x->_M_right != 0) __x = __x->_M_right;
      return __x;
    }
  };
  template<typename _Val>
    struct _Rb_tree_node : public _Rb_tree_node_base
    {
      typedef _Rb_tree_node<_Val>* _Link_type;
      _Val _M_value_field;
    };
  __attribute__ ((__pure__)) _Rb_tree_node_base*
  _Rb_tree_increment(_Rb_tree_node_base* __x) throw ();
  __attribute__ ((__pure__)) const _Rb_tree_node_base*
  _Rb_tree_increment(const _Rb_tree_node_base* __x) throw ();
  __attribute__ ((__pure__)) _Rb_tree_node_base*
  _Rb_tree_decrement(_Rb_tree_node_base* __x) throw ();
  __attribute__ ((__pure__)) const _Rb_tree_node_base*
  _Rb_tree_decrement(const _Rb_tree_node_base* __x) throw ();
  template<typename _Tp>
    struct _Rb_tree_iterator
    {
      typedef _Tp value_type;
      typedef _Tp& reference;
      typedef _Tp* pointer;
      typedef bidirectional_iterator_tag iterator_category;
      typedef ptrdiff_t difference_type;
      typedef _Rb_tree_iterator<_Tp> _Self;
      typedef _Rb_tree_node_base::_Base_ptr _Base_ptr;
      typedef _Rb_tree_node<_Tp>* _Link_type;
      _Rb_tree_iterator()
      : _M_node() { }
      explicit
      _Rb_tree_iterator(_Link_type __x)
      : _M_node(__x) { }
      reference
      operator*() const
      { return static_cast<_Link_type>(_M_node)->_M_value_field; }
      pointer
      operator->() const
      { return &static_cast<_Link_type>(_M_node)->_M_value_field; }
      _Self&
      operator++()
      {
 _M_node = _Rb_tree_increment(_M_node);
 return *this;
      }
      _Self
      operator++(int)
      {
 _Self __tmp = *this;
 _M_node = _Rb_tree_increment(_M_node);
 return __tmp;
      }
      _Self&
      operator--()
      {
 _M_node = _Rb_tree_decrement(_M_node);
 return *this;
      }
      _Self
      operator--(int)
      {
 _Self __tmp = *this;
 _M_node = _Rb_tree_decrement(_M_node);
 return __tmp;
      }
      bool
      operator==(const _Self& __x) const
      { return _M_node == __x._M_node; }
      bool
      operator!=(const _Self& __x) const
      { return _M_node != __x._M_node; }
      _Base_ptr _M_node;
  };
  template<typename _Tp>
    struct _Rb_tree_const_iterator
    {
      typedef _Tp value_type;
      typedef const _Tp& reference;
      typedef const _Tp* pointer;
      typedef _Rb_tree_iterator<_Tp> iterator;
      typedef bidirectional_iterator_tag iterator_category;
      typedef ptrdiff_t difference_type;
      typedef _Rb_tree_const_iterator<_Tp> _Self;
      typedef _Rb_tree_node_base::_Const_Base_ptr _Base_ptr;
      typedef const _Rb_tree_node<_Tp>* _Link_type;
      _Rb_tree_const_iterator()
      : _M_node() { }
      explicit
      _Rb_tree_const_iterator(_Link_type __x)
      : _M_node(__x) { }
      _Rb_tree_const_iterator(const iterator& __it)
      : _M_node(__it._M_node) { }
      reference
      operator*() const
      { return static_cast<_Link_type>(_M_node)->_M_value_field; }
      pointer
      operator->() const
      { return &static_cast<_Link_type>(_M_node)->_M_value_field; }
      _Self&
      operator++()
      {
 _M_node = _Rb_tree_increment(_M_node);
 return *this;
      }
      _Self
      operator++(int)
      {
 _Self __tmp = *this;
 _M_node = _Rb_tree_increment(_M_node);
 return __tmp;
      }
      _Self&
      operator--()
      {
 _M_node = _Rb_tree_decrement(_M_node);
 return *this;
      }
      _Self
      operator--(int)
      {
 _Self __tmp = *this;
 _M_node = _Rb_tree_decrement(_M_node);
 return __tmp;
      }
      bool
      operator==(const _Self& __x) const
      { return _M_node == __x._M_node; }
      bool
      operator!=(const _Self& __x) const
      { return _M_node != __x._M_node; }
      _Base_ptr _M_node;
    };
  void
  _Rb_tree_insert_and_rebalance(const bool __insert_left,
				_Rb_tree_node_base* __x,
				_Rb_tree_node_base* __p,
				_Rb_tree_node_base& __header) throw ();
  _Rb_tree_node_base*
  _Rb_tree_rebalance_for_erase(_Rb_tree_node_base* const __z,
	  _Rb_tree_node_base& __header) throw ();
  template<typename _Key, typename _Val, typename _KeyOfValue,
	   typename _Compare, typename _Alloc = allocator<_Val> >
    class _Rb_tree
    {
      typedef typename _Alloc::template rebind<_Rb_tree_node<_Val> >::other
	      _Node_allocator;
    protected:
      typedef _Rb_tree_node_base* _Base_ptr;
      typedef const _Rb_tree_node_base* _Const_Base_ptr;
    public:
      typedef _Key key_type;
      typedef _Val value_type;
      typedef value_type* pointer;
      typedef const value_type* const_pointer;
      typedef value_type& reference;
      typedef const value_type& const_reference;
      typedef _Rb_tree_node<_Val>* _Link_type;
      typedef const _Rb_tree_node<_Val>* _Const_Link_type;
      typedef size_t size_type;
      typedef ptrdiff_t difference_type;
      typedef _Alloc allocator_type;
      _Node_allocator&
      _M_get_Node_allocator()
      { return *static_cast<_Node_allocator*>(&this->_M_impl); }
      const _Node_allocator&
      _M_get_Node_allocator() const
      { return *static_cast<const _Node_allocator*>(&this->_M_impl); }
      allocator_type
      get_allocator() const
      { return allocator_type(_M_get_Node_allocator()); }
    protected:
      _Link_type
      _M_get_node()
      { return _M_impl._Node_allocator::allocate(1); }
      __attribute__((transaction_safe))
      void
      _M_put_node(_Link_type __p)
      { _M_impl._Node_allocator::deallocate(__p, 1); }
      __attribute__((transaction_safe))
      _Link_type
      _M_create_node(const value_type& __x)
      {
 _Link_type __tmp = _M_get_node();
 try
   { get_allocator().construct(&__tmp->_M_value_field, __x); }
 catch(...)
   {
     _M_put_node(__tmp);
     throw;
   }
 return __tmp;
      }
      void
      _M_destroy_node(_Link_type __p)
      {
 get_allocator().destroy(&__p->_M_value_field);
 _M_put_node(__p);
      }
    protected:
      template<typename _Key_compare,
	bool _Is_pod_comparator = __is_pod(_Key_compare)>
	struct _Rb_tree_impl : public _Node_allocator
	{
   _Key_compare _M_key_compare;
   _Rb_tree_node_base _M_header;
   size_type _M_node_count;
   _Rb_tree_impl()
   : _Node_allocator(), _M_key_compare(), _M_header(),
     _M_node_count(0)
   { _M_initialize(); }
   _Rb_tree_impl(const _Key_compare& __comp, const _Node_allocator& __a)
   : _Node_allocator(__a), _M_key_compare(__comp), _M_header(),
     _M_node_count(0)
   { _M_initialize(); }
 private:
   void
   _M_initialize()
   {
     this->_M_header._M_color = _S_red;
     this->_M_header._M_parent = 0;
     this->_M_header._M_left = &this->_M_header;
     this->_M_header._M_right = &this->_M_header;
   }
 };
      _Rb_tree_impl<_Compare> _M_impl;
    protected:
      _Base_ptr&
      _M_root()
      { return this->_M_impl._M_header._M_parent; }
      _Const_Base_ptr
      _M_root() const
      { return this->_M_impl._M_header._M_parent; }
      _Base_ptr&
      _M_leftmost()
      { return this->_M_impl._M_header._M_left; }
      _Const_Base_ptr
      _M_leftmost() const
      { return this->_M_impl._M_header._M_left; }
      _Base_ptr&
      _M_rightmost()
      { return this->_M_impl._M_header._M_right; }
      _Const_Base_ptr
      _M_rightmost() const
      { return this->_M_impl._M_header._M_right; }
      _Link_type
      _M_begin()
      { return static_cast<_Link_type>(this->_M_impl._M_header._M_parent); }
      _Const_Link_type
      _M_begin() const
      {
 return static_cast<_Const_Link_type>
   (this->_M_impl._M_header._M_parent);
      }
      _Link_type
      _M_end()
      { return static_cast<_Link_type>(&this->_M_impl._M_header); }
      _Const_Link_type
      _M_end() const
      { return static_cast<_Const_Link_type>(&this->_M_impl._M_header); }
      static const_reference
      _S_value(_Const_Link_type __x)
      { return __x->_M_value_field; }
      static const _Key&
      _S_key(_Const_Link_type __x)
      { return _KeyOfValue()(_S_value(__x)); }
      static _Link_type
      _S_left(_Base_ptr __x)
      { return static_cast<_Link_type>(__x->_M_left); }
      static _Const_Link_type
      _S_left(_Const_Base_ptr __x)
      { return static_cast<_Const_Link_type>(__x->_M_left); }
      static _Link_type
      _S_right(_Base_ptr __x)
      { return static_cast<_Link_type>(__x->_M_right); }
      static _Const_Link_type
      _S_right(_Const_Base_ptr __x)
      { return static_cast<_Const_Link_type>(__x->_M_right); }
      static const_reference
      _S_value(_Const_Base_ptr __x)
      { return static_cast<_Const_Link_type>(__x)->_M_value_field; }
      static const _Key&
      _S_key(_Const_Base_ptr __x)
      { return _KeyOfValue()(_S_value(__x)); }
    public:
      typedef _Rb_tree_iterator<value_type> iterator;
      typedef _Rb_tree_const_iterator<value_type> const_iterator;
      typedef std::reverse_iterator<iterator> reverse_iterator;
      typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
    private:
      iterator
      _M_insert_(_Const_Base_ptr __x, _Const_Base_ptr __y,
   const value_type& __v);
    public:
      _Rb_tree() { }
      iterator
      begin()
      {
 return iterator(static_cast<_Link_type>
   (this->_M_impl._M_header._M_left));
      }
      const_iterator
      begin() const
      {
 return const_iterator(static_cast<_Const_Link_type>
	 (this->_M_impl._M_header._M_left));
      }
      iterator
      end()
      { return iterator(static_cast<_Link_type>(&this->_M_impl._M_header)); }
      const_iterator
      end() const
      {
 return const_iterator(static_cast<_Const_Link_type>
	 (&this->_M_impl._M_header));
      }
      pair<iterator, bool>
      _M_insert_unique(const value_type& __x);
    };
  template<typename _Key, typename _Val, typename _KeyOfValue,
	   typename _Compare, typename _Alloc>
    typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
    _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
    _M_insert_(_Const_Base_ptr __x, _Const_Base_ptr __p, const _Val& __v)
    {
      _Link_type __z = _M_create_node(__v);
      return iterator(__z);
    }
  template<typename _Key, typename _Val, typename _KeyOfValue,
	   typename _Compare, typename _Alloc>
    pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
      _Compare, _Alloc>::iterator, bool>
    _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
    _M_insert_unique(const _Val& __v)
    {
      _Link_type __x = _M_begin();
      _Link_type __y = _M_end();
      iterator __j = iterator(__y);
 return pair<iterator, bool>(_M_insert_(__x, __y, __v), true);
    }
}
namespace std __attribute__ ((__visibility__ ("default"))) {
  template<typename _Key, typename _Compare = std::less<_Key>,
    typename _Alloc = std::allocator<_Key> >
    class set
    {
    public:
      typedef _Key key_type;
      typedef _Key value_type;
      typedef _Compare key_compare;
      typedef _Compare value_compare;
      typedef _Alloc allocator_type;
    private:
      typedef typename _Alloc::template rebind<_Key>::other _Key_alloc_type;
      typedef _Rb_tree<key_type, value_type, _Identity<value_type>,
	 key_compare, _Key_alloc_type> _Rep_type;
      _Rep_type _M_t;
    public:
      typedef typename _Key_alloc_type::pointer pointer;
      typedef typename _Key_alloc_type::const_pointer const_pointer;
      typedef typename _Key_alloc_type::reference reference;
      typedef typename _Key_alloc_type::const_reference const_reference;
      typedef typename _Rep_type::const_iterator iterator;
      typedef typename _Rep_type::const_iterator const_iterator;
      typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
      typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
      typedef typename _Rep_type::size_type size_type;
      typedef typename _Rep_type::difference_type difference_type;
      std::pair<iterator, bool>
      insert(const value_type& __x)
      {
   _M_t._M_insert_unique(__x);
      }
    };
}
__attribute__((transaction_pure))
void* operator new(size_t);
__attribute__((transaction_pure))
void operator delete(void*);
class Widget
{
private:
};
class Screen
{
protected:
std::set<Widget *> widgets;
public:
void addWidget(Widget* widget);
};
void Screen::addWidget(Widget* widget)
{
widgets.insert(widget);
}