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99dee823 | 1 | // Copyright (C) 2020-2021 Free Software Foundation, Inc. |
38b17c27 FD |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-options "-std=gnu++17 -D_GLIBCXX_ASSERTIONS" } | |
19 | // { dg-do compile { target c++17 xfail *-*-* } } | |
20 | ||
21 | #include <string_view> | |
22 | ||
23 | typedef std::string_view string_view_type; | |
24 | ||
25 | constexpr char | |
26 | back() | |
27 | { | |
28 | string_view_type s(""); | |
29 | return s.back(); | |
30 | } | |
31 | ||
32 | static_assert(back() != 'a'); // { dg-error "non-constant condition" } | |
33 | ||
34 | // { dg-prune-output "in 'constexpr' expansion" } | |
35 | // { dg-prune-output "failed_assertion" } |