/guava/guava/src/com/google/common/collect/RegularImmutableSortedSet.java
position = Collections.binarySearch( target, elements, unsafeComparator( ) ) ;
position = Collections.binarySearch ( elements, target, unsafeComparator ( ) ) ;
int indexOf(@CheckForNull Object target) { if (target == null) { return -1; } int position; try { <extra_id_0> } catch (ClassCastException e) { return -1; } return (position >= 0) ? position : -1; } @Override