b95b77f92f
4034: Add semantic tag for unresolved references r=matklad a=matklad This is a quick way to implement unresolved reference diagnostics. For example, adding to VS Code config "editor.tokenColorCustomizationsExperimental": { "unresolvedReference": "#FF0000" }, will highlight all unresolved refs in red. Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>