Segfault on Option<T> inside struct if T is non-pointer type and it's name equals to a struct name

Following code will result into segfault if you would try to run it;

``` rust
struct Test {
    parent: Option<Test>
}

fn main() {
    let v = Test{ parent: None };
}
```

``` bash
$ rust -v
rust 0.8-pre (4ecb0a3 2013-09-15 01:50:50 -0700)
```
