[libcxx-commits] [libcxx] [libc++] Add tests for LWG3949 and mark it as done (PR #208272)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> I'm somewhat on the fence whether this is complete or nothing to do, but given that it seems it was required before and accidentally deleted nothing to do seems fine.

Yeah, I'm on the fence too. Since the LWG issue is basically fixing wording that was broken by a previous change, I think we're closer to Nothing To Do, but really both would be applicable.

https://github.com/llvm/llvm-project/pull/208272