[libcxx-commits] [libcxx] [libc++] P3450R1: Extend `std::is_within_lifetime` (PR #201053)

[Hristo Hristov via libcxx-commits]

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

LGTM. Let's wait awhile for another oppinion though. 

https://github.com/llvm/llvm-project/pull/201053