Comment by philiplu

I worked on that! I was a dev on the team that built the first IntelliSense engine for C++. It’s a miracle it worked at all. It was based on a hacked-up version of the C++ front-end, but when it inevitably hit errors attempting a single-pass parse of the current source, it would silently bull its way through and try not to get too screwed up. Doing that in the presence of templates was not a good time. But with the RAM and processing speeds available then, I’m still kind of shocked it worked at all, 28 years ago.