{"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
        let (block_a, bit_a) = Self::bit_index(start);
    fn set_range_inbounds(&mut self, start: Size, end: Size, new_state: bool) {
        let (block_b, bit_b) = Self::bit_index(end);