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

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cor3ntin wrote:

Can you add a test for CWG2363 just showing we have the intended behavior ? (in CXX/drs/26xx.cpp)

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