| //===----------------------------------------------------------------------===// | |
| // | |
| // 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> | |
| #include <experimental/optional> | |
| #ifndef _LIBCPP_VERSION | |
| #error _LIBCPP_VERSION not defined | |
| #endif | |
| int main() | |
| { | |
| } |