The behaviour didn't change since commit 5b08c1742a536f54bd5e270b00ff851cbc7314ef (Recommit <chrono> changes with a couple xtra tests marked to fail on apple's clang.)
* http://wg21.link/lwg3221
Reviewed By: ldionne, #libc
Differential Revision: https://reviews.llvm.org/D92730