No, those were actual language issues, not missing headers or things like that. For instance: https://developercommunity.visualstudio.com/t/if-constexprrequires

No, those were actual language issues, not missing headers or things like that. For instance: https://developercommunity.visualstudio.com/t/if-constexprrequires----in-a-lamb/10293106 https://developercommunity.visualstudio.com/t/if-constexprre... Which is extremely frustrating when i reported a very similar issue in 17.4 which was reported as fixed (https://developercommunity.visualstudio.com/t/if-constexprrequires----broken-in/10162506 https://developercommunity.visualstudio.com/t/if-constexprre...), etc. I try building my code every once in a while against MSVC because it has some useful warnings but am very burn out with code breaking on almost every minor version - I shifted all my serious work to clang+libc++ on windows a few years ago already. E.g. I've reported something like 50+ bugs, internal compiler errors, etc... to MS over the years and only a couple for clang even though I use it much much more.