throw new AssertionError(e);
      } catch (IllegalAccessException e) {
        // That API is public.
        throw newLinkageError(e);
      } catch (NoSuchMethodException e) {
        // Only introduced in Java 9.
        return null;
      }
    }

    private static LinkageError newLinkageError(Throwable cause) {
      return new LinkageError(cause.toString(), cause);
    }
  }

      try {
        return method.invoke(map, args);
      } catch (InvocationTargetException e) {
        throw e.getCause();
      } catch (IllegalAccessException e) {
        throw newLinkageError(e);
      }
    }
  }

  /** Verifies that {@code setUp} and {@code tearDown} are called in all map test cases. */
  private static Test testsForSetUpTearDown() {

        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