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83ffe9cd | 1 | // Copyright (C) 2019-2023 Free Software Foundation, Inc. |
b5c433ce JW |
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 | ||
ed8fcd0d | 18 | // { dg-do compile { target c++20 } } |
b5c433ce JW |
19 | |
20 | #include <span> | |
21 | ||
37edf28c PP |
22 | constexpr bool |
23 | test01(bool b) | |
b5c433ce JW |
24 | { |
25 | std::span<int, 0> s; | |
37edf28c | 26 | if (b || !s.empty()) |
a92a4340 | 27 | (void) s.back(); |
37edf28c | 28 | return true; |
b5c433ce | 29 | } |
37edf28c PP |
30 | |
31 | static_assert(test01(false)); | |
32 | static_assert(test01(true)); // { dg-error "non-constant" } | |
5e8a30d8 JW |
33 | // { dg-error "assert_fail" "" { target *-*-* } 0 } |
34 | // { dg-prune-output "called in a constant expression" } |