text: // Copyright (C) 2017-2020 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING3.  If not see
  // <http://www.gnu.org/licenses/>.
  
  // { dg-options "-std=gnu++17" }
  // { dg-do compile { target c++17 } }
  
  #include <string_view>
  
  constexpr wchar_t c1[] = L"one";
  constexpr wchar_t c2[] = L"two";
  
  constexpr std::wstring_view s1{c1};
  constexpr std::wstring_view s2{c2};
  
  constexpr int n1 = s1.compare(s1);
  constexpr int n2 = s1.compare(s2);
  