s3transfer/crt.py [348:358]:
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    def cancel(self):
        self._coordinator.cancel()

    def set_exception(self, exception):
        """Sets the exception on the future."""
        if not self.done():
            raise TransferNotDoneError(
                'set_exception can only be called once the transfer is '
                'complete.'
            )
        self._coordinator.set_exception(exception, override=True)
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s3transfer/futures.py [108:118]:
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    def cancel(self):
        self._coordinator.cancel()

    def set_exception(self, exception):
        """Sets the exception on the future."""
        if not self.done():
            raise TransferNotDoneError(
                'set_exception can only be called once the transfer is '
                'complete.'
            )
        self._coordinator.set_exception(exception, override=True)
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