[all-commits] [llvm/llvm-project] bc4d50: [clang] Implement CWG2877 "Type-only lookup for us...

[Vlad Serebrennikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bc4d50f02ded9eea287daccf2b4a39ae5d30abd0
      https://github.com/llvm/llvm-project/commit/bc4d50f02ded9eea287daccf2b4a39ae5d30abd0
  Author: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
  Date:   2024-06-21 (Fri, 21 Jun 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Sema/Sema.h
    M clang/lib/Parse/ParseDeclCXX.cpp
    M clang/lib/Sema/SemaDeclCXX.cpp
    M clang/test/CXX/drs/cwg26xx.cpp
    M clang/test/CXX/drs/cwg28xx.cpp
    M clang/test/SemaCXX/cxx20-using-enum.cpp
    M clang/www/cxx_dr_status.html

  Log Message:
  -----------
  [clang] Implement CWG2877 "Type-only lookup for using-enum-declarator" (#95399)

This patch implements 2024-05-31 resolution of a tentatively ready issue
[CWG2877](https://cplusplus.github.io/CWG/issues/2877.html) "Type-only
lookup for using-enum-declarator", which supersedes earlier
[CWG2621](https://cplusplus.github.io/CWG/issues/2621.html) "Kind of
lookup for `using enum` declarations".

Now we perform type-only lookup (not to be confused with type-only
context) for `elaborated-enum-declarator`. This is the same kind of
lookup that elaborated type specifiers and base specifiers undergo.

I also found out (and fixed) that one of our existing tests claimed that
a dependent type can be used in `elaborated-enum-declarator`, but that's
not the case:
> The
[using-enum-declarator](http://eel.is/c++draft/enum.udecl#nt:using-enum-declarator)
shall designate a non-dependent type with a reachable
[enum-specifier](http://eel.is/c++draft/dcl.enum#nt:enum-specifier)[.](http://eel.is/c++draft/enum.udecl#1.sentence-2)



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