Proposed resolution:

This wording is relative to N4481 in regard to fundamental-ts-2 changes.

1. Change class template ostream_joiner synopsis, [iterator.ostream.joiner] p2, as indicated:

   namespace std {
   namespace experimental {
   inline namespace fundamentals_v2 {
   
   template <class DelimT, class charT = char, class traits = char_traits<charT> >
     class ostream_joiner {
     public:
       […]
       ostream_joiner<DelimT, charT,traits>& operator*() noexcept;
       ostream_joiner<DelimT, charT,traits>& operator++() noexcept;
       ostream_joiner<DelimT, charT,traits>& operator++(int) noexcept;
       […]
     };
   
   } // inline namespace fundamentals_v2
   } // namespace experimental
   } // namespace std
   

2. Change [iterator.ostream.joiner.ops] p3+5, as indicated:

   ostream_joiner<DelimT, charT, traits>& operator*() noexcept;
   

   […]

   ostream_joiner<DelimT, charT, traits>& operator++() noexcept;
   ostream_joiner<DelimT, charT, traits>& operator++(int) noexcept;
   

[ 2015-05, Lenexa ]

Move to Immediate.

Addresses: fund.ts.v2

In Library Fundamentals 2 N4481, [iterator.ostream.joiner], all operations are no-ops other than the assignment operator.

So, they should be marked as noexcept.