| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <optional> |
| |
| // A program that necessitates the instantiation of template optional for a |
| // reference type is ill-formed. |
| |
| #include <experimental/optional> |
| |
| int main() |
| { |
| #if _LIBCPP_STD_VER > 11 |
| using std::experimental::optional; |
| |
| optional<int&&> opt; |
| #else |
| #error |
| #endif // _LIBCPP_STD_VER > 11 |
| } |
