*/
  public final void visit(@Nullable Type... types) {
    for (Type type : types) {
      if (type == null || !visited.add(type)) {
        // null owner type, or already visited;
        continue;
      }
      boolean succeeded = false;
      try {
        if (type instanceof TypeVariable) {
          visitTypeVariable((TypeVariable<?>) type);

    assertEquals(Outer.Sub.class, subtype.getRawType());
    assertThat(subtype.getActualTypeArguments()[0]).isInstanceOf(WildcardType.class);
    ParameterizedType owner = (ParameterizedType) subtype.getOwnerType();
    assertEquals(Outer.class, owner.getRawType());
    // This returns a strange ? extends Sub2<Y> type, which isn't ideal.
    TypeToken<?> unused = new TypeToken<BaseWithTypeVar<List<?>>>() {}.getSubtype(Outer.Sub2.class);