}

  // TODO(b/172823566): Use mainline testToImmutableList once CollectorTester is usable to java7.
  public void testToImmutableList_java7_combine() {
    ImmutableList.Builder<String> zis = ImmutableList.<String>builder().add("a", "b");
    ImmutableList.Builder<String> zat = ImmutableList.<String>builder().add("c", "d");