{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"assert!(sub_dir_name.ends_with('-'),"}]}
    assert!(sub_dir_name.ends_with('-'), "{:?}", sub_dir_name);
    // Double-check that we kept this: "s-{timestamp}-{random-number}-"
    assert!(sub_dir_name.as_bytes().iter().filter(|b| **b == b'-').count() == 3);