valueUpdater = lookup.findVarHandle(AbstractFutureState.class, "valueField", Object.class);
      } catch (ReflectiveOperationException e) {
        // Those fields exist.
        throw newLinkageError(e);
      }
    }

    @Override
    void putThread(Waiter waiter, Thread newValue) {
      waiterThreadUpdater.setRelease(waiter, newValue);
    }

    @Override