TypeVariableInvocationHandler(TypeVariableImpl<?> typeVariableImpl) {
      this.typeVariableImpl = typeVariableImpl;
    }

    @Override
    @CheckForNull
    public Object invoke(Object proxy, Method method, @CheckForNull @Nullable Object[] args)
        throws Throwable {
      String methodName = method.getName();
      Method typeVariableMethod = typeVariableMethods.get(methodName);

  }

  @J2ktIncompatible
  @GwtIncompatible // java.lang.reflect
  private static Object invokeAccessibleNonThrowingMethod(
      Method method, Object receiver, Object... params) {
    try {
      return method.invoke(receiver, params);
    } catch (IllegalAccessException e) {
      throw new RuntimeException(e);
    } catch (InvocationTargetException e) {
      throw propagate(e.getCause());
    }
  }

    T instance = invoke(factory, args);
    if (instance == null) {
      throw new FactoryMethodReturnsNullException(factory);
    }
    return instance;
  }

  private static <T> @Nullable T invoke(Invokable<?, ? extends T> factory, List<?> args)
      throws InvocationTargetException, IllegalAccessException {
    T returnValue = factory.invoke(null, args.toArray());
    if (returnValue == null) {

                  throws Throwable {
                throw exception;
              }
            });
    T wrapper = wrapperFunction.apply(proxy);
    try {
      method.invoke(wrapper, getParameterValues(method));
      fail(method + " failed to throw exception as is.");
    } catch (InvocationTargetException e) {
      if (exception != e.getCause()) {
        throw new RuntimeException(e);

                  throws Throwable {
                throw exception;
              }
            });
    T wrapper = wrapperFunction.apply(proxy);
    try {
      method.invoke(wrapper, getParameterValues(method));
      fail(method + " failed to throw exception as is.");
    } catch (InvocationTargetException e) {
      if (exception != e.getCause()) {
        throw new RuntimeException(e);

  public void testNextDown() throws Exception {
    Method jdkNextDown = getJdkNextDown();
    for (double d : FINITE_DOUBLE_CANDIDATES) {
      assertEquals(jdkNextDown.invoke(null, d), DoubleUtils.nextDown(d));
    }
  }

  private static Method getJdkNextDown() throws Exception {
    try {
      return Math.class.getMethod("nextDown", double.class);

          final Iterator<ListFrobber> remainingActions = actionsToPerformConcurrently.iterator();

          final Set<List<Integer>> allStates = newHashSet();

          @Override
          public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            return method.equals(getAllStatesMethod)
                ? getAllStates()
                : invokeListMethod(method, args);
          }

   * Verifies that {@code method} produces a {@link NullPointerException} or {@link
   * UnsupportedOperationException} whenever <i>any</i> of its non-nullable parameters are null.
   *
   * @param instance the instance to invoke {@code method} on, or null if {@code method} is static
   */
  public void testMethod(@Nullable Object instance, Method method) {
    Class<?>[] types = method.getParameterTypes();

      Class<?> finalizableReferenceClass,
      ReferenceQueue<Object> queue,
      PhantomReference<Object> frqReference) {
    /*
     * We use FinalizableReference.class for two things:
     *
     * 1) To invoke FinalizableReference.finalizeReferent()
     *
     * 2) To detect when FinalizableReference's class loader has to be garbage collected, at which
     * point, Finalizer can stop running
     */

  }

  private static final InvocationHandler X_RETURNER =
      new InvocationHandler() {
        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
          return "x";
        }
      };

  private static int classesInitialized = 0;

  private static class A {
    static {