{"ast_node_type":"variable","tokens":[{"end":25,"kind":"keyword","start":0,"text":"let"}]}
    let b0b = b0.clone();
    let mut b0 = ChunkedBitSet::<usize>::new_empty(0);
    assert_eq!(b0, ChunkedBitSet { domain_size: 0, chunks: Box::new([]), marker: PhantomData });