* stable. There is usually no reason to retain a reference of type {@code SetView}; typically,
   * you either use it as a plain {@link Set}, or immediately invoke {@link #immutableCopy} or
   * {@link #copyInto} and forget the {@code SetView} itself.
   *
   * @since 2.0
   */
  public abstract static class SetView<E extends @Nullable Object> extends AbstractSet<E> {
    private SetView() {} // no subclasses but our own

    /**

   * for APIs like {@link #whenAllComplete whenAllComplete(...)}{@code .}{@link
   * FutureCombiner#call(Callable, Executor) call(...)}, where it is easy to use a new input from
   * the {@code call} implementation but forget to add it to the arguments of {@code
   * whenAllComplete}.
   *
   * <p>If you are looking for a method to determine whether a given {@code Future} is done, use the
   * instance method {@link Future#isDone()}.

et?jnihs?ynan??ukohak???iin!.&a&ga?k&ium?oagan??munou!imanim??t&a&bihs?giin??ioy??w&a&gioti?kikes?zuy??irak??yijo??e&kustim?mabust??i&aniat?hcamakot?kaz&awihsak?omuzi??m&a&gat?karum??o???n&anust?esog??o&das?ihcot?jnas?k&ihay?oym??mak?naga?ries??u&ories?steoj?????i&k&a!.&a&go?k&asok?oimak??t&ago!rihcah??ika!atik???w&aki?oyk???e&mojog?natim?suranihsagih?t&ado?okoy???i&hsoyirom?magatak?naokimak??nesiad?o&hakin?jnoh!iruy??nuzak?rihson?tasi&juf?m??yjnoh??u&kobmes?oppah????in,?o!.&a&dakatognub?m&asah?...

            lines could make c.g.c.base.testModule transitively inherit from extra modules. If some
            of those modules are ones that it uses but forgets to list in its own <inherits>, we'd
            like to get an error. Currently we do, but if we add the extra <inherits> lines, we
            won't.