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

[bohdan-shulha]

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

struct Test {
    parent: Option<Test>
}

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

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

[sfackler]

Dup of #3779