.fold( new NonSerializable(42), new FoldFunction<Tuple2<Integer, NonSerializable>, NonSerializable>() {
.fold(0, new FoldFunction<Tuple2<Integer, Integer>, Integer>() { private static final long serialVersionUID = 4875723041825726082L;
.fold(Tuple2.of(0, 0L), new FoldFunction<Tuple2<Integer, Long>, Tuple2<Integer, Long>>() { @Override public Tuple2<Integer, Long> fold(