import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.util.concurrent.Futures.getDone;
import static com.google.common.util.concurrent.MoreExecutors.rejectionPropagatingExecutor;
import static com.google.common.util.concurrent.NullnessCasts.uncheckedCastNullableTToT;
import static com.google.common.util.concurrent.Platform.isInstanceOfThrowableClass;

FIELD com.google.common.collect.TreeTraverser.PreOrderIterator.stack
FIELD com.google.common.util.concurrent.AbstractFuture.Listener.executor com.google.common.util.concurrent.MoreExecutors.rejectionPropagatingExecutor.$
FIELD com.google.common.util.concurrent.AbstractService.listeners
# NonReentrantExecutor is not exposed to this field

   * executor to the given {@code future}.
   *
   * <p>Note, the returned executor can only be used once.
   */
  static Executor rejectionPropagatingExecutor(Executor delegate, AbstractFuture<?> future) {
    checkNotNull(delegate);
    checkNotNull(future);
    if (delegate == directExecutor()) {
      // directExecutor() cannot throw RejectedExecutionException