text: // -*- C++ -*-
  //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // UNSUPPORTED: c++98, c++03, c++11
  // UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8, clang-3.9
  // UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8
  
  #include <string_view>
  #include <cassert>
  
  int main()
  {
      std::string_view foo  =   ""sv;  // should fail w/conversion operator not found
  }
  