[libcxx-commits] [libcxx] [libc++] Implement LWG3476: Add mandates to thread, jthread, and async (PR #173363)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

Mostly LGTM now. However, it seems to me that the PR title and description (which will be used as squashed commit message by default) are incorrect.

For `async`, this PR mainly removes incorrect (not merely redundant) decay-copy. This change is sufficient to implement LWG3476, and the rest (adding `static_assert`s) can be considered as QoI improvement. Also, for `jthread` this PR only expands tests.

Would you mind to reword the title and description?

https://github.com/llvm/llvm-project/pull/173363