'rustc' has overflowed its stack -- illegal hardware instruction

[carllerche]

Repro:

trait Node<N: Node> {
    fn children(&self) -> Iterator<N>;
}

trait Graph<N: Node> {
    fn nodes(&self) -> Iterator<N>;
}

pub fn main() {
}

[alexcrichton]

Closing as a dupe of #11824
Sadly the compiler doesn't currently handle trait Node<N: Node> that well.