//===----------------------------------------------------------------------===//
//
// 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++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>
void f() {
std::optional<std::nullopt_t> opt; // expected-note 1 {{requested here}}
std::optional<const std::nullopt_t> opt1; // expected-note 1 {{requested here}}
std::optional<std::nullopt_t &> opt2; // expected-note 1 {{requested here}}
std::optional<std::nullopt_t &&> opt3; // expected-note 1 {{requested here}}
// expected-error@optional:* 4 {{instantiation of optional with nullopt_t is ill-formed}}
}