cor3ntin 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`)

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