Method exception

crates/stdlib/src/_asyncio.rs:247–263

(&self, vm: &VirtualMachine)

        #[pymethod]
        fn exception(&self, vm: &VirtualMachine) -> PyResult {
            match self.fut_state.load() {
                FutureState::Pending => Err(new_invalid_state_error(vm, "Exception is not set.")),
                FutureState::Cancelled => {
                    let exc = self.make_cancelled_error_impl(vm);
                    Err(exc)
                }
                FutureState::Finished => {
                    self.fut_log_tb.store(false, Ordering::Relaxed);
                    Ok(self
                        .fut_exception
                        .read()
                        .clone()
                        .unwrap_or_else(|| vm.ctx.none()))
                }
            }
        }

        #[pymethod]
        fn set_result(zelf: PyRef<Self>, result: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {