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- //===----------------------------------------------------------------------===//
- //
- // 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.
- //
- //===----------------------------------------------------------------------===//
- // UNSUPPORTED: c++98, c++03, c++11
- // <optional>
- // A program that necessitates the instantiation of template optional for a
- // reference type is ill-formed.
- #include <experimental/optional>
- int main()
- {
- using std::experimental::optional;
- optional<int&> opt;
- }
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