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      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 // T shall be an object type and shall satisfy the requirements of Destructible
     13 
     14 #include <experimental/optional>
     15 
     16 int main()
     17 {
     18 #if _LIBCPP_STD_VER > 11
     19     using std::experimental::optional;
     20 
     21     optional<const void> opt;
     22 #else
     23 #error
     24 #endif  // _LIBCPP_STD_VER > 11
     25 }
     26