zygoloid wrote:
For what it's worth, the existing "keyword from language you're not using"
warnings [already fire for analogous Objective-C++
cases](https://godbolt.org/z/3K6835PPK)... which in those cases is correct,
since Clang does *not* accept C++11-onwards keywords as selector names in the
corresponding versions of Objective-C++.
I wonder if it'd suffice to do a single-token lookahead / lookbehind in
Objective-C / Objective-C++ and disable all of these warnings if the previous
token is `@` or the next token is `:`. That would have false negatives for some
weird cases like `class co_await : base {};` under `-Wc++20-compat` in
Objective-C++17 or earlier, but that might be better than losing the warning
entirely.
https://github.com/llvm/llvm-project/pull/137234
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