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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// A program that necessitates the instantiation of template optional for
// (possibly cv-qualified) nullopt_t is ill-formed.
#include <optional>
int main(int, char**)
{
using std::optional;
using std::nullopt_t;
using std::nullopt;
optional<nullopt_t> opt; // expected-note 1 {{requested here}}
optional<const nullopt_t> opt1; // expected-note 1 {{requested here}}
optional<nullopt_t &> opt2; // expected-note 1 {{requested here}}
optional<nullopt_t &&> opt3; // expected-note 1 {{requested here}}
// expected-error@optional:* 4 {{instantiation of optional with nullopt_t is ill-formed}}
return 0;
}
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