fromMap.entrySet().iterator(), asEntryToEntryFunction(transformer));
    }

    @Override
    @GwtIncompatible("Spliterator")
    Spliterator<Entry<K, V2>> entrySpliterator() {
      return CollectSpliterators.map(
          fromMap.entrySet().spliterator(),
          Spliterator.DISTINCT | Spliterator.NONNULL,
          asEntryToEntryFunction(transformer));
    }

    @Override

  /** Views an entry transformer as a function from entries to entries. */
  static <K extends @Nullable Object, V1 extends @Nullable Object, V2 extends @Nullable Object>
      Function<Entry<K, V1>, Entry<K, V2>> asEntryToEntryFunction(
          EntryTransformer<? super K, ? super V1, V2> transformer) {
    checkNotNull(transformer);
    return entry -> transformEntry(transformer, entry);
  }