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

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

We don't have any infrastructure for this kind of test currently, so I don't think you need to add a test. If you have a good idea I'd be interested though.

Let's tackle the regression for now. If we have some general guidelines when to add `[[gnu::nodebug]]` we should add that in a separate PR. I've looked into adding a clang-tidy check to add the attribute to all libc++-internal aliases, so a discussion on any heuristic we can use would be nice.

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