def set_closable(self, closable):
        self.widget.setClosable(closable)
Transmits an error to the client and terminates the exchange.
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/qt_dock_item.py/QtDockItem.set_closable--crossover with--dataset/ETHPy150Open facebook/fbtftp/fbtftp/base_handler.py/BaseHandler._transmit_error