--- /dev/null
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2014-2018 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/>.
+
+#include <string_view>
+
+template<typename C, typename T>
+ using check1_t = std::basic_string_view<C, T>;
+
+using check2_t = std::string_view;
+
+#ifdef _GLIBCXX_USE_C99_STDINT_TR1
+using check3_t = std::u16string_view;
+using check4_t = std::u32string_view;
+#endif
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+using check5_t = std::wstring_view;
+#endif
+