Function next

crates/vm/src/stdlib/builtins.rs:896–915

(
        iterator: PyObjectRef,
        default_value: OptionalArg<PyObjectRef>,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn next(
        iterator: PyObjectRef,
        default_value: OptionalArg<PyObjectRef>,
        vm: &VirtualMachine,
    ) -> PyResult<PyIterReturn> {
        if !PyIter::check(&iterator) {
            return Err(vm.new_type_error(format!(
                "{} object is not an iterator",
                iterator.class().name()
            )));
        }
        PyIter::new(iterator)
            .next(vm)
            .map(|iter_ret| match iter_ret {
                PyIterReturn::Return(obj) => PyIterReturn::Return(obj),
                PyIterReturn::StopIteration(v) => {
                    default_value.map_or(PyIterReturn::StopIteration(v), PyIterReturn::Return)
                }
            })
    }

    #[pyfunction]
    fn oct(number: ArgIndex, vm: &VirtualMachine) -> PyResult {