svoid dm_afterUnvisualize(final Runnable r) {
  final DynModule m = dm_current_mandatory();
  dm_ownResource(vmBus_onMessage('moduleUnvisualized, voidfunc(O module) {
    O mm = dm_resolveModule(module);
    if (mm == m) {
      temp m.enter();
      callF(r);
    }
  }));
}