Proposed resolution:

This wording is relative to N4944.

1. Modify the class synopsis in [range.enumerate.iterator] as shown:

   
       constexpr explicit
         iterator(iterator_t<Base> current, difference_type pos);  // exposition only
   

2. Modify the detailed description in [range.enumerate.iterator] as shown:

     constexpr explicit iterator(iterator_t<Base> current, difference_type pos);
   

   -2- Effects: Initializes current_ with std::move(current) and pos_ with pos.