| // Copyright (C) 2020-2021 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 "-D_GLIBCXX_ASSERTIONS" } |
| // { dg-do compile { target c++17 xfail *-*-* } } |
| |
| #include <string_view> |
| |
| typedef std::wstring_view string_view_type; |
| |
| constexpr wchar_t |
| front() |
| { |
| string_view_type s(L""); |
| return s.front(); |
| } |
| |
| static_assert(front() != L'a'); // { dg-error "non-constant condition" } |
| |
| // { dg-prune-output "in 'constexpr' expansion" } |
| // { dg-prune-output "unreachable" } |
