[libcxx-commits] [libcxx] [libcxx] Put `std::monostate` in `<utility>` (PR #128373)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja commented:

The test failure seem due to unrelated reasons. Let's wait for the fix.

I _guess_ some maintainers want to implement this in C++17 (as a conforming extension).

https://github.com/llvm/llvm-project/pull/128373