[PATCH] D45179: [libc++] Add _LIBCPP_ENABLE_NODISCARD and _LIBCPP_NODISCARD_EXT to allow pre-C++2a [[nodiscard]]

[Eric Fiselier via Phabricator via cfe-commits]

EricWF added a comment.

I don't think it ever landed. I'll try to get it in this week.


https://reviews.llvm.org/D45179