old_id vs id

scheme/scheme.rs

@@ -172,10 +172,10 @@ impl Scheme for FileScheme {
 
     /* Resource operations */
     #[allow(unused_variables)]
-    fn dup(&mut self, id: usize) -> Result<usize> {
-        // println!("Dup {}, {:X} {}", id);
+    fn dup(&mut self, old_id: usize) -> Result<usize> {
+        // println!("Dup {}", old_id);
 
-        let resource = try!(try!(self.files.get(&id).ok_or(Error::new(EBADF))).dup());
+        let resource = try!(try!(self.files.get(&old_id).ok_or(Error::new(EBADF))).dup());
 
         let id = self.next_id as usize;
         self.next_id += 1;