> The limitations of &mut cannot be trivially worked around. > The "trivial" equivalent to JavaScript is not RefCell, but plain old Cell, applied at the level

> The limitations of &mut cannot be trivially worked around. > The "trivial" equivalent to JavaScript is not RefCell, but plain old Cell, applied at the level of individual fields you want to write to. No panics and no (relative) overhead there. I thought you were implying that we could trivially work around Rust's problems by just using Cell everywhere, my comment was in response to that. It seems now that you were talking about something else, so nevermind =)