// deserialized.
  @GwtIncompatible
  @J2ktIncompatible
  static final class FieldSettersHolder {
    static final Serialization.FieldSetter<? super ImmutableMultimap<?, ?>> MAP_FIELD_SETTER =
        Serialization.getFieldSetter(ImmutableMultimap.class, "map");
    static final Serialization.FieldSetter<? super ImmutableMultimap<?, ?>> SIZE_FIELD_SETTER =
        Serialization.getFieldSetter(ImmutableMultimap.class, "size");

        ? ((ImmutableSortedSet<V>) emptySet).comparator()
        : null;
  }

  @GwtIncompatible
  @J2ktIncompatible
  private static final class SetFieldSettersHolder {
    static final Serialization.FieldSetter<? super ImmutableSetMultimap<?, ?>>
        EMPTY_SET_FIELD_SETTER =
            Serialization.getFieldSetter(ImmutableSetMultimap.class, "emptySet");
  }

  @GwtIncompatible
  @J2ktIncompatible

        ? ((ImmutableSortedSet<V>) emptySet).comparator()
        : null;
  }

  @GwtIncompatible
  @J2ktIncompatible
  private static final class SetFieldSettersHolder {
    static final Serialization.FieldSetter<? super ImmutableSetMultimap<?, ?>>
        EMPTY_SET_FIELD_SETTER =
            Serialization.getFieldSetter(ImmutableSetMultimap.class, "emptySet");
  }

  @GwtIncompatible
  @J2ktIncompatible