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: group.rs
    path of file: ./repos/uefi-rs/xtask/src/device_path
    
    the code of the file until where you have to start completion: use super::node::{is_node_attr, Node};
use heck::ToUpperCamelCase;
use proc_macro2::{Span, TokenStream};
use quote::quote;
use syn::{Attribute, Ident, Item, ItemMod, ItemStruct};

#[derive(Clone)]
pub struct DeviceType(Ident);

impl DeviceType {
    pub fn module_ident(&self) -> &Ident {
        &self.0
    }

    pub fn const_ident(&self) -> Ident {
        Ident::new(&self.upper_name(), Span::call_site())
    }

    pub fn upper_name(&self) -
    
    pub fn parse(module: &ItemMod) -> Self {
        let items = &module.content.as_ref().unwrap().1;

        let device_type = DeviceType(module.ident.clone());

        let mut group = Self {
            device_type,
            nodes: Vec::new(),
            friends: Vec::new(),
            build_friends: Vec::new(),
        };

        for item in items {
            if let Some(struct_item) = get_node_struct(item) {
                group
                    .nodes
                    .push(Node::parse(struct_item, &group.device_type));
            } else {
                let mut item = item.clone();
                if has_build_attr(&item) {
                    remove_build_attr(&mut item);
                    group.build_friends.push(item);
                } else {
                    group.friends.push(item);
                }
            }
        }

        group
    }