{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
                    // `ctxt` with the second `enclosing_breakables` borrow below.
                    // below, so can't move this block of code to the enclosing scope and share
                    let mut enclosing_breakables = self.enclosing_breakables.borrow_mut();