1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14
10 // <optional>
11
12 // A program that necessitates the instantiation of template optional for
13 // (possibly cv-qualified) nullopt_t is ill-formed.
14
15 #include <optional>
16
main(int,char **)17 int main(int, char**)
18 {
19 using std::optional;
20 using std::nullopt_t;
21 using std::nullopt;
22
23 optional<nullopt_t> opt; // expected-note 1 {{requested here}}
24 optional<const nullopt_t> opt1; // expected-note 1 {{requested here}}
25 optional<nullopt_t &> opt2; // expected-note 1 {{requested here}}
26 optional<nullopt_t &&> opt3; // expected-note 1 {{requested here}}
27 // expected-error@optional:* 4 {{instantiation of optional with nullopt_t is ill-formed}}
28
29 return 0;
30 }
31