
`__has_cpp_attribute(__nodiscard__)` is always true now, so we might as well replace `_LIBCPP_NODISCARD`. It's one less macro that can result in bad diagnostics.
`__has_cpp_attribute(__nodiscard__)` is always true now, so we might as well replace `_LIBCPP_NODISCARD`. It's one less macro that can result in bad diagnostics.