* type variable too.
   */
  @CheckForNull
  final TypeToken<? super T> getGenericSuperclass() {
    if (runtimeType instanceof TypeVariable) {
      // First bound is always the super class, if one exists.
      return boundAsSuperclass(((TypeVariable<?>) runtimeType).getBounds()[0]);
    }
    if (runtimeType instanceof WildcardType) {
      // wildcard has one and only one upper bound.

    assertEquals(
        new TypeToken<Enum<T>>() {},
        TypeToken.of(new TypeCapture<T>() {}.capture()).getGenericSuperclass());
    assertEquals(TypeToken.of(Object.class), new TypeToken<T[]>() {}.getGenericSuperclass());
  }

  public <T extends List<String> & Serializable>
      void testGetGenericSuperclass_typeVariable_boundIsInterface() {

    assertEquals(
        new TypeToken<Enum<T>>() {},
        TypeToken.of(new TypeCapture<T>() {}.capture()).getGenericSuperclass());
    assertEquals(TypeToken.of(Object.class), new TypeToken<T[]>() {}.getGenericSuperclass());
  }

  public <T extends List<String> & Serializable>
      void testGetGenericSuperclass_typeVariable_boundIsInterface() {