AaronBallman wrote:

> > So you want this to be a FEATURE in C2y and an EXTENSION in older language 
> > modes?
> 
> Presumably yes.
> 
> > And when we get the countof macro in a few months, this becomes unnecessary?
> 
> Are most users going to include `stdcountof.h` ?
> 
> My assumption is that they would not, so having the feature thingy is useful 
> (especially in a library that may be concerned about not defining `countof`)

Hmmm okay, that seems reasonable enough.

https://github.com/llvm/llvm-project/pull/133125
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