Method set__cancel_message

crates/stdlib/src/_asyncio.rs:696–701

(&self, value: PySetterValue)

        #[pygetset(setter)]
        fn set__cancel_message(&self, value: PySetterValue) {
            match value {
                PySetterValue::Assign(v) => *self.fut_cancel_msg.write() = Some(v),
                PySetterValue::Delete => *self.fut_cancel_msg.write() = None,
            }
        }

        #[pygetset]
        fn _asyncio_awaited_by(&self, vm: &VirtualMachine) -> PyResult<PyObjectRef> {