* code.
   *
   * @param formalType is {@code Foo<formalType>} a supertype of {@code Foo<T>}?
   * @param declaration The type variable in the context of a parameterized type. Used to infer type
   *     bound when {@code formalType} is a wildcard with implicit upper bound.
   */
  private boolean is(Type formalType, TypeVariable<?> declaration) {
    if (runtimeType.equals(formalType)) {
      return true;
    }