/guava/guava/src/com/google/common/collect/ImmutableSortedSet.java
return null;
return this;
@Override public Builder<E> add(E... elements) { checkElementsNotNull(elements); for (E e : elements) { add(e); } <extra_id_0> } @CanIgnoreReturnValue @Override public Builder<E> addAll(Iterable<? extends E> elements) { super.addAll(elements); return this;