static <A> L<A> unwrapSynchronizedList(L<A> l) {
  ifdef OurSyncCollections
    if (l cast SynchronizedList) ret l.list;
  endifdef
  if (eqOneOf(className(l),
    "java.util.Collections$SynchronizedList",
    "java.util.Collections$SynchronizedRandomAccessList"))
    ret (L) get_raw(l, 'list);
  ret l;
}