static ThreadLocal<L<S>> genLog_log;

static L<S> genLog() {
  genLog_init();
  L<S> log = genLog_log.get();
  /*if (log == null)
    log = (L) callOpt(creator(), "genLog");*/
  ret assertNotNull("No log set for this thread", log);
}

static void genLog_set(L<S> log) {
  genLog_init();
  genLog_log.set(log);
}

static void genLog_clear() {
  genLog_init();
  genLog_log.set(null);
}

static void genLog_init() {
  if (genLog_log == null) {
    genLog_log = (ThreadLocal) getOpt(creator(), "genLog_log");
    if (genLog_log == null) genLog_log = new ThreadLocal;
  }
}