Method next

crates/vm/src/stdlib/_collections.rs:659–669

(zelf: &Py<Self>, vm: &VirtualMachine)

    impl SelfIter for PyDequeIterator {}
    impl IterNext for PyDequeIterator {
        fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {
            zelf.internal.lock().next(|deque, pos| {
                if zelf.state != deque.state.load() {
                    return Err(vm.new_runtime_error("Deque mutated during iteration"));
                }
                let deque = deque.borrow_deque();
                Ok(PyIterReturn::from_result(
                    deque.get(pos).cloned().ok_or(None),
                ))
            })
        }
    }

    #[pyattr]