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: saveload_system.rs
    path of file: ./repos/rustrogueliketutorial/chapter-41-camera/src
    
    the code of the file until where you have to start completion: use specs::prelude::*;
use specs::saveload::{SimpleMarker, SimpleMarkerAllocator, SerializeComponents, DeserializeComponents, MarkedBuilder};
use specs::error::NoError;
use super::components::*;
use std::fs::File;
use std::path::Path;
use std::fs;

macro_rules! serialize_individually {
    ($ec
    
pub fn save_game(ecs : &mut World) {
    // Create helper
    let mapcopy = ecs.get_mut::<super::map::Map>().unwrap().clone();
    let savehelper = ecs
        .create_entity()
        .with(SerializationHelper{ map : mapcopy })
        .marked::<SimpleMarker<SerializeMe>>()
        .build();

    // Actually serialize
    {
        let data = ( ecs.entities(), ecs.read_storage::<SimpleMarker<SerializeMe>>() );

        let writer = File::create("./savegame.json").unwrap();
        let mut serializer = serde_json::Serializer::new(writer);
        serialize_individually!(ecs, serializer, data, Position, Renderable, Player, Viewshed, Monster,
            Name, BlocksTile, CombatStats, SufferDamage, WantsToMelee, Item, Consumable, Ranged, InflictsDamage,
            AreaOfEffect, Confusion, ProvidesHealing, InBackpack, WantsToPickupItem, WantsToUseItem,
            WantsToDropItem, SerializationHelper, Equippable, Equipped, MeleePowerBonus, DefenseBonus,
            WantsToRemoveItem, ParticleLifetime, HungerClock, ProvidesFood, MagicMapper, Hidden,
            EntryTrigger, EntityMoved, SingleActivation, BlocksVisibility, Door
        );
    }

    // Clean up
    ecs.delete_entity(savehelper).expect("Crash on cleanup");
}