45   template<typename _Iterator, typename _Sequence>
54   template<typename _Iterator>
56     __check_singular(_Iterator& __x)  in __check_singular()
66   template<typename _Iterator, typename _Sequence>
68     __check_singular(const _Safe_iterator<_Iterator, _Sequence>& __x)  in __check_singular()  argument
73   template<typename _Iterator>
75     __check_dereferenceable(_Iterator&)  in __check_dereferenceable()  argument
85   template<typename _Iterator, typename _Sequence>
87     __check_dereferenceable(const _Safe_iterator<_Iterator, _Sequence>& __x)  in __check_dereferenceable()  argument
146   template<typename _Iterator, typename _Sequence>
148     __valid_range(const _Safe_iterator<_Iterator, _Sequence>& __first,  in __valid_range()  argument
149 		  const _Safe_iterator<_Iterator, _Sequence>& __last)  in __valid_range()