...id 'DOMRefCell already mutably borrowed' messages. This is just a temporary fix until the Rust standard library allows borrowing already-borrowed RefCell values during unwinding. It also removes LiveDOMReferences destructor that it's a no-op but it contains an assert that was being violated causing an endless cycle of destructor calls ending up in a stack overflow. Source-Repo: https://github.com/servo/servo Source-Revision: a7e29939a1df679bd865573dc71f7ba65f0268c4