static <A> Set<A> unwrapSynchronizedSet(Set<A> set) {
  if (eqOneOf(className(set),
    "java.util.Collections$SynchronizedSet",
    "java.util.Collections$SynchronizedSortedSet",
    "java.util.Collections$SynchronizedNavigableSet"))
    ret (Set) get_raw(set, 'c);
  ret set;
}