Now with Atomicity

tests/bonusheap.rs

@@ -1,13 +1,12 @@
 extern crate rustijvm;
 
 use std::fs::File;
-use std::rc::Rc;
-use std::sync::Mutex;
+use std::sync::{Arc, Mutex};
 use std::io::{Cursor, Seek, SeekFrom, Read};
 
 fn run_bfi(file: &str) -> String {
     let file = File::open(file).expect("Missing bf file");
-    let rc = Rc::new(Mutex::new(Cursor::new(Vec::new())));
+    let rc = Arc::new(Mutex::new(Cursor::new(Vec::new())));
     let mut machine = rustijvm::Machine::new_from_file("files/bonus/bfi.ijvm").unwrap();
     machine.set_output(rc.clone());
     machine.set_input(Box::new(file));