30 lines
1.0 KiB
C++
30 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// A program that necessitates the instantiation of template optional for
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// (possibly cv-qualified) nullopt_t is ill-formed.
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#include <optional>
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int main()
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{
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using std::optional;
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using std::nullopt_t;
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using std::nullopt;
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optional<nullopt_t> opt; // expected-note 1 {{requested here}}
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optional<const nullopt_t> opt1; // expected-note 1 {{requested here}}
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optional<nullopt_t &> opt2; // expected-note 1 {{requested here}}
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optional<nullopt_t &&> opt3; // expected-note 1 {{requested here}}
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// expected-error@optional:* 4 {{instantiation of optional with nullopt_t is ill-formed}}
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}
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