[libcxx-commits] [libcxx] [libc++] Implement P2988R12: `std::optional<T&>` (PR #155202)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja commented:

I've just come up with some comments. Not sure whether any of them is blocking.

https://github.com/llvm/llvm-project/pull/155202