181   let rollback: UpdatesStateContextRollback?  variable
206       "rollback": rollback?.json
224     self.rollback = nil
247     var rollback: UpdatesStateContextRollback?  variable
261       self.rollback = original.rollback
274         rollback: rollback,  in toContext()
364     let rollback: UpdatesStateContextRollback?  in reducedContext()  variable
366       rollback = UpdatesStateContextRollback(commitTime: rollbackCommitTime)  in reducedContext()
368       rollback = nil  in reducedContext()
384         $0.rollback = nil  in reducedContext()
393         $0.rollback = rollback  in reducedContext()