}

    final ImmutableList<AbstractFuture<T>> delegates = delegatesBuilder.build();
    for (int i = 0; i < copy.length; i++) {
      final int localI = i;
      copy[i].addListener(() -> state.recordInputCompletion(delegates, localI), directExecutor());
    }

    @SuppressWarnings("unchecked")
    ImmutableList<ListenableFuture<T>> delegatesCast = (ImmutableList) delegates;
    return delegatesCast;