Hello. I have a question. Does Visual C++ still not support C++ 11 or is it an error on cppreference? If this is an error, then maybe we should fix it? I hope I did not distract you much, I understand that this does not apply to STL...

This question is indeed off-topic but I can answer it anyways.
The C99 preprocessor is currently controlled by /experimental:preprocessor. In VS 2019 16.6 Preview 2, it will be available as /Zc:preprocessor with enhanced behavior, but it won't yet be implied by /std:c++latest or /permissive-, so I still consider its support to be partial. This should hopefully be complete soon, although we don't have an ETA yet.
I don't know why cppreference claims that C++11 constexpr support is partial. The MSVC compiler recently fixed a severe bug in constant initialization, if that's what that was referring to.
Thank you @StephanTLavavej, I showed the link to this conversation to the guys from cppreference and now both items are green.
