[libcxx-commits] [libcxx] [libc++] P2641R4: Checking if a `union` alternative is active (`std::is_within_lifetime`) (PR #107450)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

Sorry for the delay! LGTM with minor changes.

You'll have to rebase this on top of `main`, too. I suggest you discard your changes to the modulemap and re-apply them manually instead, that's a lot easier.

https://github.com/llvm/llvm-project/pull/107450