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

[Mark de Wever via cfe-commits]

https://github.com/mordante commented:

A few more comments, I overlooked parts of them yesterday.

Please make sure to apply the suggestions to all similar places in the code.

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