how to use / simulate a using declaration in unityscript

I am having trouble trying to convert this C# script to a unityscript

 using UnityEngine;
 using System.Collections;
 using System.IO;
 
 public class saveLoad : MonoBehaviour {
 
  public int[] someValue;
 void SaveData()
 {
 using(var writer = new BinaryWriter(File.OpenWrite("FileName")))
 {
     for(int o = 0; o < someValue.Length; o++){
     writer.Write(someValue[o]);
             }
 writer.Close();
 }
 }
  
 void LoadData()
 {
 using(var reader = new BinaryReader(File.OpenRead("FileName")))
 {
 for(int o = 0; o < someValue.Length; o++){
 someValue[o] = reader.ReadInt32();
                 
             }
 reader.Close();
 }
 }
     
 void OnGUI(){
         if(GUI.Button(new Rect(100,100,100,25),"Save")){
             SaveData();    
         }
         if(GUI.Button(new Rect(100,125,100,25),"Load")){
             LoadData();    
         }
         for(int i = 0; i < someValue.Length; i++){
             GUI.Label(new Rect(225,100+(i*25),100,25),"Data Value "+i+" :" + someValue[i]);
         }
     }
 }

My problem is with the using declarations, does anybody have any suggestions on how to convert this to unityscript?