throws Exception {
    // Make sure we are actually running with the expected helper implementation
    Class<?> abstractFutureStateClass = classLoader.loadClass(AbstractFutureState.class.getName());
    Method helperMethod = abstractFutureStateClass.getDeclaredMethod("atomicHelperTypeForTest");
    helperMethod.setAccessible(true);

    extends AbstractFuture.TrustedFuture<OutputT> {
  /*
   * The following fields are package-private, even though we intend never to use them outside this
   * file. For discussion, see AbstractFutureState.
   */

  // Lazily initialized the first time we see an exception; not released until all the input futures
  // have completed and we have processed them all.