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

[David Blaikie via libcxx-commits]

dwblaikie wrote:

(oh, and @cjdb who had asked me about the nodebug attribute on type traits previously)

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