optional_lvalue_ref.fail.cpp revision 01afa5c6e407e985d9643707d7b7ab1384bd9317 
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// <optional>
11
12// A program that necessitates the instantiation of template optional for a
13// reference type is ill-formed.
14
15#include <optional>
16
17int main()
18{
19#if _LIBCPP_STD_VER > 11
20    std::optional<int&> opt;
21#else
22#error
23#endif  // _LIBCPP_STD_VER > 11
24}
25