The error/warning highlight does indeed work but it only works after you save the file! Because its not checking in real time for error/warnings, it can trow people think it does not work. I also was under the impression it did not work.
By the way: Another nice add-on is: [https://marketplace.visualstudio.com/items?itemName=spywhere.guides](https://marketplace.visualstudio.com/items?itemName=spywhere.guides) Do not forget to put in your settings: "guides.sendUsagesAndStats": false
