[clang] [Clang][Sema] Diagnose friend declarations with enum elaborated-type-specifier in all language modes (PR #80171)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@cor3ntin I added a test with a note stating that [CWG2363](http://wg21.link/CWG2363) was closed as NAD

https://github.com/llvm/llvm-project/pull/80171