CharSequence[] result = ObjectArrays.concat(new String[0], new String[0], CharSequence.class);
    assertEquals(CharSequence[].class, result.getClass());
  }

  public void testToArrayImpl1() {
    doTestToArrayImpl1(new ArrayList<Integer>());
    doTestToArrayImpl1(Lists.newArrayList(1));
    doTestToArrayImpl1(Lists.<@Nullable Integer>newArrayList(1, null, 3));
  }