[clang] [clang-tools-extra] [Clang][Sema] Diagnose class member access expressions naming non-existent members of the current instantiation prior to instantiation in the absence of dependent base classes (PR #84050)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@pranavk @ilovepi I have a potential fix ready... give me a few to test some edge cases 

https://github.com/llvm/llvm-project/pull/84050