1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 // <optional>
12
13 // A program that necessitates the instantiation of template optional for
14 // (possibly cv-qualified) in_place_t is ill-formed.
15
16 #include <optional>
17
main()18 int main()
19 {
20 using std::optional;
21 using std::in_place_t;
22 using std::in_place;
23
24 optional<in_place_t> opt; // expected-note {{requested here}}
25 // expected-error@optional:* {{"instantiation of optional with in_place_t is ill-formed"}}
26 }
27