Converting my app to use Swift 2, and I'm getting a crash on this if-let where clause (that worked in 1.2):Used to look like this:if showFilterButton { if let dataController = dataController() as? FilteredCoreDataController, filter = dataController.filter where filter.customized { filterButton = UIBarButtonItem(image: UIImage(named: FilterFilled), style: .Plain, target: self, action: showFilters:) } else { filterButton = UIBarButtonItem(image: UIImage(named: Filter), style: .Plain, target: self, action: showFilters:) } } else { filterButton = nil }But it crashes on line 2. Finally discovered that removing the where clause doesn't crash the app (but obviously doesn't give me the behavior I want). Thought it was something weird like Apple changing how where clauses with in an if-let clause, but even separating it out into a nested if doesn't work:if showFilterButton { if let dataController = dataController() as? FilteredCoreDataController, filter = dataController.filter {//where filter.customi