[libcxx-commits] [libcxx] [libc++] Add __detected_or_t and use it to implement some of the allocator traits aliases (PR #115654)

[via libcxx-commits]

cmtice wrote:

Quick question: I don't usually work in libcxx: What's the best way to officially test my change? And do I need to try to write a test case for this?

https://github.com/llvm/llvm-project/pull/115654