static O unstructureInRealm(S s, fO realm) {
  Class mc = mainClass(realm);
  S mcDollar = mc.getName() + "$";
  printVars unstructureInRealm(+mc, +mcDollar);
  
  O classFinder = callOpt(mc, "_defaultClasFinder");
  if (classFinder != null)
    print("Using realm's class finder");
  else classFinder = func(S name) {
    S rewrittenName = replacePrefix("main$", mcDollar, name);
    printVars("classFinder in realm: ", +name, +rewrittenName);
    O result = getClass_noConvertName(realm, rewrittenName);
    print("result: " + result);
    ret result;
  };
  
  // notify module that we are loading (old)
  temp tempSetTL((ThreadLocal) callOpt(mc, 'dynamicObjectIsLoading_threadLocal), true);
  
  // because this is now global anyway
  temp tempSetTL(dynamicObjectIsLoading_threadLocal(), true);
  
  ret unstructure(s, false, classFinder);
}