{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"is_loop_header:"}]}
            is_loop_header: DenseBitSet::new_empty(num_nodes),
            dominator_order_rank: IndexVec::from_elem_n(0, num_nodes),
            enclosing_loop_header: IndexVec::from_elem_n(None, num_nodes),