{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"assert_eq!(d.immediate_dominator(4),"}]}
    assert_eq!(d.immediate_dominator(4), Some(6));
    assert_eq!(d.immediate_dominator(3), Some(6));
    assert_eq!(d.immediate_dominator(5), Some(6));