final Type capture() {
    Type superclass = getClass().getGenericSuperclass();
    checkArgument(superclass instanceof ParameterizedType, "%s isn't parameterized", superclass);
    return ((ParameterizedType) superclass).getActualTypeArguments()[0];
  }

     * </p>
     *
     * @return an array of {@link ParameterizedClassDesc} representing the type arguments
     * @see ParameterizedType#getActualTypeArguments()
     */
    ParameterizedClassDesc[] getArguments();

    Type type = new TypeCapture<EnumSet<E>>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override
      void visitParameterizedType(ParameterizedType t) {
        visit(t.getActualTypeArguments());
      }

      @Override
      void visitTypeVariable(TypeVariable<?> t) {
        visit(t.getBounds());
      }
    }.visit(type);
  }

  private static void assertVisited(Type type) {

                                .getGenericReturnType();
                        if (returnType instanceof ParameterizedType parameterizedType) {
                            return !parameterizedType.getActualTypeArguments()[0].equals(String.class);
                        } else {
                            return false;
                        }
                    } catch (ReflectiveOperationException | SecurityException e) {

 *
 * {@snippet :
 * new TypeVisitor() {
 *   protected void visitParameterizedType(ParameterizedType t) {
 *     visit(t.getOwnerType());
 *     visit(t.getActualTypeArguments());
 *   }
 *   protected void visitGenericArrayType(GenericArrayType t) {
 *     visit(t.getGenericComponentType());
 *   }
 *   protected void visitTypeVariable(TypeVariable<?> t) {

    Type type = new TypeCapture<EnumSet<E>>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override
      void visitParameterizedType(ParameterizedType t) {
        visit(t.getActualTypeArguments());
      }

      @Override
      void visitTypeVariable(TypeVariable<?> t) {
        visit(t.getBounds());
      }
    }.visit(type);
  }

  private static void assertVisited(Type type) {

  }

  private static <T> Type aWildcardType() {
    ParameterizedType parameterizedType =
        (ParameterizedType) new TypeCapture<List<? extends T>>() {}.capture();
    return parameterizedType.getActualTypeArguments()[0];
  }

  }

  private static <T> Type aWildcardType() {
    ParameterizedType parameterizedType =
        (ParameterizedType) new TypeCapture<List<? extends T>>() {}.capture();
    return parameterizedType.getActualTypeArguments()[0];
  }