[clang] [Clang][Sema] Reject array prvalue operands (PR #140702)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> > This is related to CWG2548
> 
> Kinda, but not really. It has never been necessary to create that (non-)issue. Or does someone really believe that it is a C++ defect that `IA{ 1, 2, 3 } - IA{ 1, 2, 3 }` is not allowed? So, it is just a bug since C++11

I think it is CWG2548; that's what made it clear that array-to-pointer decay does not happen here despite that being inconsistent with the rest of the language (https://github.com/cplusplus/papers/issues/1633)

https://github.com/llvm/llvm-project/pull/140702