You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: map.rs
    path of file: ./repos/RustPython/vm/src/builtins
    
    the code of the file until where you have to start completion: use super::{PyType, PyTypeRef};
use crate::{
    builtins::PyTupleRef,
    class::PyClassImpl,
    function::PosArgs,
    protocol::{PyIter, PyIterReturn},
    types::{Constructor, IterNext, Iterable, SelfIter},
    Context, Py, PyObjectRef, PyPayload, PyResult, VirtualMachine,
};

#[pyclass(module = false, name = "map", traverse)]
#[derive(Debug)]
pub struct PyMap 
    
    fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {
        let mut next_objs = Vec::new();
        for iterator in &zelf.iterators {
            let item = match iterator.next(vm)? {
                PyIterReturn::Return(obj) => obj,
                PyIterReturn::StopIteration(v) => return Ok(PyIterReturn::StopIteration(v)),
            };
            next_objs.push(item);
        }

        // the mapper itself can raise StopIteration which does stop the map iteration
        PyIterReturn::from_pyresult(zelf.mapper.call(next_objs, vm), vm)
    }