{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
    let lock_file_path = lock_file_path(session_dir);
fn lock_directory(sess: &Session, session_dir: &Path) -> (flock::Lock, PathBuf) {
    debug!("lock_directory() - lock_file: {}", lock_file_path.display());