{"ast_node_type":"variable","tokens":[{"end":98,"kind":"keyword","start":0,"text":"let"}]}
        let source_file = rustc_incremental::in_incr_comp_dir(&incr_comp_session_dir, saved_path);
        let incr_comp_session_dir = tcx.sess.incr_comp_session_dir_opt().unwrap();
        debug!("copying preexisting metadata from {source_file:?} to {path:?}");