}

  private static <T> T[] arrayOf(T... objs) {
    return objs;
  }

  @J2ktIncompatible
  @GwtIncompatible("assumptions about splitting")
  public void testKeySetSplittable() {
    ImmutableMap<Integer, Integer> map =
        ImmutableMap.<Integer, Integer>builder()
            .put(1, 1)
            .put(2, 2)
            .put(3, 3)
            .put(4, 4)