this.<@Nullable Object, @Nullable Object>genericTestSynchronizedMultimapSampleCodeCompilation();
  }

  @J2ktIncompatible // Synchronized
  private <K extends @Nullable Object, V extends @Nullable Object>
      void genericTestSynchronizedMultimapSampleCodeCompilation() {
    K key = null;

    Multimap<K, V> multimap = synchronizedMultimap(HashMultimap.<K, V>create());