text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <locale>
  
  // wbuffer_convert<Codecvt, Elem, Tr>
  
  // streambuf *rdbuf(streambuf *bytebuf);
  
  #include <locale>
  #include <codecvt>
  #include <sstream>
  #include <cassert>
  
  int main(int, char**)
  {
      typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > B;
      {
          std::stringstream s;
          B b;
          assert(b.rdbuf() == nullptr);
          b.rdbuf(s.rdbuf());
          assert(b.rdbuf() == s.rdbuf());
      }
  
    return 0;
  }
  