Proposed resolution:

This wording is relative to N4140.

1. Add a new function to the synopsis in [storage.iterator] p1:

   namespace std {
     template <class OutputIterator, class T>
     class raw_storage_iterator
       : public iterator<output_iterator_tag,void,void,void,void> {
     public:
       explicit raw_storage_iterator(OutputIterator x);
   
       raw_storage_iterator<OutputIterator,T>& operator*();
       raw_storage_iterator<OutputIterator,T>& operator=(const T& element);
       raw_storage_iterator<OutputIterator,T>& operator++();
       raw_storage_iterator<OutputIterator,T> operator++(int);
       OutputIterator base() const;
   };
   }
   

2. Insert the new function and a new paragraph series after p7:

   OutputIterator base() const;
   

   -?- Returns: An iterator of type OutputIterator that points to the same value as *this points to.