{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
    // Double-check that we kept this: "s-{timestamp}-{random-number}-"
    sub_dir_name.truncate(sub_dir_name.len() - "working".len());
    assert!(sub_dir_name.ends_with('-'), "{:?}", sub_dir_name);