[all-commits] [llvm/llvm-project] da2a9e: [clang] Update C++ DR status page (#121642)

[Vlad Serebrennikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: da2a9ede81a88bea0bba28a543441197772e4727
      https://github.com/llvm/llvm-project/commit/da2a9ede81a88bea0bba28a543441197772e4727
  Author: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
  Date:   2025-01-04 (Sat, 04 Jan 2025)

  Changed paths:
    M clang/test/CXX/drs/cwg12xx.cpp
    M clang/test/CXX/drs/cwg28xx.cpp
    M clang/test/CXX/drs/cwg29xx.cpp
    M clang/www/cxx_dr_status.html
    M clang/www/make_cxx_dr_status

  Log Message:
  -----------
  [clang] Update C++ DR status page (#121642)

This patch brings our C++ DR status page up to date with WG21 updates.

[CWG1223](https://cplusplus.github.io/CWG/issues/1223.html) "Syntactic
disambiguation and _trailing-return-types_" is resolved by
[P2915R0](https://wg21.link/p2915r0) "Proposed resolution for CWG1223".
Both the test and the paper were written by @cor3ntin, so I presume no
updates are needed.

[CWG2819](https://cplusplus.github.io/CWG/issues/2819.html) "Cast from
null pointer value in a constant expression" was revisited and marked as
not a DR, so I updated the test to ensure that the example is not
accepted in C++23 and earlier modes. CC @offsetof.

Tentantive resolutions to the following issues were simply promoted to
actual resolutions, so tests don't require any meaningful changes:
- [CWG2913](https://cplusplus.github.io/CWG/issues/2913.html) "Grammar
for deduction-guide has requires-clause in the wrong position"
(@zyn0217)
- [CWG2915](https://cplusplus.github.io/CWG/issues/2915.html) "Explicit
object parameters of type void" (@MitalAshok)
- [CWG2922](https://cplusplus.github.io/CWG/issues/2922.html) "constexpr
placement-new is too permissive" (@cor3ntin)

As a drive-by fix, I updated the `make_cxx_dr_status` script to
accommodate for `C++23 onwards` and `C++26 onwards` statuses, which are
useful for Core issues that are not DRs.



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