https://github.com/Sirraide commented:

Looks like you’ll have to update some tests because CI is failing (also, I’d be 
very surprised if we didn’t have tests for this). Also, this still needs a 
release note.

Maybe a fix for the virtual anchor pattern would be to somehow not emit the 
warning for the first virtual function in a class, but that feels like too much 
of a hack...

As to *whether* this should be enabled by default, I don’t really have strong 
opinions on that. It does seem like you’d usually not want to introduce new 
virtual functions in a `final` class; the anchor is really the only use case I 
can think of.

https://github.com/llvm/llvm-project/pull/133265
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