}

  abstract C combine(List<@Nullable Present<V>> values);

  /** Used for {@link Futures#allAsList} and {@link Futures#successfulAsList}. */
  static final class ListFuture<V extends @Nullable Object>
      extends CollectionFuture<V, List<@Nullable V>> {
    ListFuture(
        ImmutableCollection<? extends ListenableFuture<? extends V>> futures,
        boolean allMustSucceed) {
      super(futures, allMustSucceed);
      init();
    }

import com.google.common.base.Function;
import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.CollectionFuture.ListFuture;
import com.google.common.util.concurrent.ImmediateFuture.ImmediateCancelledFuture;
import com.google.common.util.concurrent.ImmediateFuture.ImmediateFailedFuture;

                List<Future<List<ProjectBuildingResult>>> futures = executor.invokeAll(callables);
                return futures.stream()
                        .map(listFuture -> {
                            try {
                                return listFuture.get();
                            } catch (InterruptedException e) {
                                uncheckedThrow(e);
                                return null;

                   builds with JDK8 began failing animal-sniffer with the error:

                   Failed to check signatures: Bad class file .../CollectionFuture$ListFuture.class

                   One way of dealing with that would be to disable
                   animal-sniffer. And that would be fine for our -jre builds:

    assertTrue(future1.wasInterrupted());
  }

  /**
   * Test the case where the futures are fulfilled prior to constructing the ListFuture. There was a
   * bug where the loop that connects a Listener to each of the futures would die on the last
   * loop-check as done() on ListFuture nulled out the variable being looped over (the list of
   * futures).
   */
  public void testAllAsList_doneFutures() throws Exception {

    assertTrue(future1.wasInterrupted());
  }

  /**
   * Test the case where the futures are fulfilled prior to constructing the ListFuture. There was a
   * bug where the loop that connects a Listener to each of the futures would die on the last
   * loop-check as done() on ListFuture nulled out the variable being looped over (the list of
   * futures).
   */
  public void testAllAsList_doneFutures() throws Exception {