[llvm] [clang] [clang-tools-extra] [mlir] [libcxx] [libc] [libc++][span] P2821R5: span.at() (PR #74994)

[Hristo Hristov via cfe-commits]

H-G-Hristov wrote:

I don't know what is the accepted protocol, who should click  the "Resolve conversation" buttons (e.g. the author...), so I'll leave them unclicked.
Thank you for the review!

https://github.com/llvm/llvm-project/pull/74994