@bobbrow Issue still exist with documents that was not saved on disk. Version 0.25.0. Steps to reproduce (via command palette): 1. New Untitled File 2. Change Language Mode -> C 3. Format Document But if you save that document, problem will gone. _Originally posted by @lorond in https://github.com/microsoft/vscode-cpptools/issues/1232#issuecomment-524623481_