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[libc++] Test LWG4113: Disallow has_unique_object_representations<Incomplete[]>
LWG4113 can be considered implemented in Clang 19 due to 6451806. A follow-up change e59ed0f simplified error messages.
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‎libcxx/docs/Status/Cxx2cIssues.csv‎

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"`LWG4085 <https://wg21.link/LWG4085>`__","``ranges::generate_random``'s helper lambda should specify the return type","2024-11 (Wrocław)","","","`#118347 <https://github.com/llvm/llvm-project/issues/118347>`__",""
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"`LWG4088 <https://wg21.link/LWG4088>`__","``println`` ignores the locale imbued in ``std::ostream``","2024-11 (Wrocław)","|Complete|","18","`#118348 <https://github.com/llvm/llvm-project/issues/118348>`__",""
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"`LWG4112 <https://wg21.link/LWG4112>`__","``has-arrow`` should required ``operator->()`` to be ``const``-qualified","2024-11 (Wrocław)","","","`#118349 <https://github.com/llvm/llvm-project/issues/118349>`__",""
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"`LWG4113 <https://wg21.link/LWG4113>`__","Disallow ``has_unique_object_representations<Incomplete[]>``","2024-11 (Wrocław)","|Complete|","","`#118350 <https://github.com/llvm/llvm-project/issues/118350>`__",""
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"`LWG4113 <https://wg21.link/LWG4113>`__","Disallow ``has_unique_object_representations<Incomplete[]>``","2024-11 (Wrocław)","|Complete|","19","`#118350 <https://github.com/llvm/llvm-project/issues/118350>`__",""
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"`LWG4119 <https://wg21.link/LWG4119>`__","``generator::promise_type::yield_value(ranges::elements_of<R, Alloc>)``'s nested ``generator`` may be ill-formed","2024-11 (Wrocław)","","","`#118351 <https://github.com/llvm/llvm-project/issues/118351>`__",""
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"`LWG4124 <https://wg21.link/LWG4124>`__","Cannot format ``zoned_time`` with resolution coarser than ``seconds``","2024-11 (Wrocław)","","","`#118352 <https://github.com/llvm/llvm-project/issues/118352>`__",""
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"`LWG4126 <https://wg21.link/LWG4126>`__","Some feature-test macros for fully freestanding features are not yet marked freestanding","2024-11 (Wrocław)","","","`#118353 <https://github.com/llvm/llvm-project/issues/118353>`__",""

‎libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.verify.cpp‎

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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: std-at-least-c++17
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// <type_traits>
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// has_unique_object_representations
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// Verify that has_unique_object_representations(_v) rejects incomplete class and enumeration types and arrays thereof.
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#include <type_traits>
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class IC;
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constexpr bool v1 = std::has_unique_object_representations<IC>::value;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v2 = std::has_unique_object_representations<IC[]>::value;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v3 = std::has_unique_object_representations<IC[1]>::value;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v4 = std::has_unique_object_representations<IC[][1]>::value;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v5 = std::has_unique_object_representations_v<IC>;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v6 = std::has_unique_object_representations_v<IC[]>;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v7 = std::has_unique_object_representations_v<IC[1]>;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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constexpr bool v8 = std::has_unique_object_representations_v<IC[][1]>;
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// expected-error@-1 {{incomplete type 'IC' used in type trait expression}}
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enum E {
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v9 = std::has_unique_object_representations<E>::value,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v10 = std::has_unique_object_representations<E[]>::value,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v11 = std::has_unique_object_representations<E[1]>::value,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v12 = std::has_unique_object_representations<E[][1]>::value,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v13 = std::has_unique_object_representations_v<E>,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v14 = std::has_unique_object_representations_v<E[]>,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v15 = std::has_unique_object_representations_v<E[1]>,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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v16 = std::has_unique_object_representations_v<E[][1]>,
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// expected-error@-1 {{incomplete type 'E' used in type trait expression}}
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};

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