* common ways to create a {@code ListenableFuture} include instantiating a {@link SettableFuture},
 * submitting a task to a {@link ListeningExecutorService}, and deriving a {@code Future} from an
 * existing one, typically using methods like {@link Futures#transform(ListenableFuture,
 * com.google.common.base.Function, java.util.concurrent.Executor) Futures.transform} and {@link

        E first = table.get(index);

        // Look for an existing entry.
        for (E e = first; e != null; e = e.getNext()) {
          K entryKey = e.getKey();
          if (e.getHash() == hash
              && entryKey != null
              && map.keyEquivalence.equivalent(key, entryKey)) {
            // We found an existing entry.

            V entryValue = e.getValue();

    public ImmutableSet<@NonNull E> immutableCopy() {
      return ImmutableSet.copyOf((SetView<@NonNull E>) this);
    }

    /**
     * Copies the current contents of this set view into an existing set. This method has equivalent
     * behavior to {@code set.addAll(this)}, assuming that all the sets involved are based on the
     * same notion of equivalence.
     *

    @CanIgnoreReturnValue
    private int collectTypes(K type, Map<? super K, Integer> map) {
      Integer existing = map.get(type);
      if (existing != null) {
        // short circuit: if set contains type it already contains its supertypes
        return existing;
      }
      // Interfaces should be listed before Object.
      int aboveMe = getRawType(type).isInterface() ? 1 : 0;