Segmentation fault with rust 0.12.0 nightly : traits and references #15660

struct Stuff {
  items : [Box<int>,..3]
}

impl Index<uint,Box<int>> for Stuff {
  fn index<'a>(&'a self, i: &uint) -> &'a Box<int> {
    return &self.items[*i];
  }
}

fn main(){
  let val = Stuff {items:[box 0,box 1,box 2]};
  let val2 = val[1];
  let val2 = val[1];
  println!("{}",val2);
}

rustc 0.12.0-pre-nightly (3d70f50b2ce2e04bb8db934721eeaddb80a7cc27 2014-07-14 00:31:30 +0000)