Hey all,

Here is a new paper for the November mailing detailing some missing feature
test macros as pointed out by Jonathan Wakely on the SG10 list and
implementing Richard Smith's suggestion on how to resolve it:
https://isocpp.org/files/papers/P2493R0.html

One of these changes (for __cpp_constexpr) isn't even a change to the
working draft, and is solely a change to SD-FeatureTest (SD-6).

Thanks,

Barry

PS. I'm not sure who the right list of implementers is to CC for each
compiler, please forward as appropriate to the right people.