Please please don't do this. It hurts readability, and relies on a subtle grammar ambiguity. Without a highlighting editor (e.g. reading a diff in a code review) I'll be scratching my head trying to read this. And tools like editors that have an imperfect parser are likely to get confused.

There's a chance you'll confuse yourself (or your code reviewer or other reader) and spend an hour debugging to find what you thought was commented out wasn't. That's not worth it to save one keystroke.