/guava/guava/src/com/google/common/collect/MoreCollectors.java
extras.addAll ( other.extras ) ;
return this; } else { if (extras.isEmpty()) { extras = new ArrayList<>(); } extras.add(other.element); <extra_id_0> if (extras.size() > MAX_EXTRAS) { extras.subList(MAX_EXTRAS, extras.size()).clear(); throw multiples(true); } return this; }