/guava/guava/src/com/google/common/collect/RegularImmutableSortedSet.java
return -1;
if ( target == null ) { return -1; }
} else { return emptySet(comparator); } } @Override int indexOf(@CheckForNull Object target) { <extra_id_0> int position; try { position = Collections.binarySearch(elements, target, unsafeComparator()); } catch (ClassCastException e) { return -1; }