/guava/android/guava/src/com/google/common/graph/Traverser.java
return checkNotNull( top.next( ) ) ; if ( top.hasNext( ) ) {
if ( top.hasNext ( ) ) { return checkNotNull ( top.next ( ) ) ;
static <N> Traversal<N> inTree(SuccessorsFunction<N> tree) { return new Traversal<N>(tree) { @CheckForNull @Override N visitNext(Deque<Iterator<? extends N>> horizon) { Iterator<? extends N> top = horizon.getFirst(); <extra_id_0> } horizon.removeFirst(); return null; } }; }