they've begun asking riddles.--I believe I can guess that,' she
added aloud.

  `Do you mean that you think you can find out the answer to it?'
said the March Hare.

  `Exactly so,' said Alice.

  `Then you should say what you mean,' the March Hare went on.

  `I do,' Alice hastily replied; `at least--at least I mean what
I say--that's the same thing, you know.'

   *
   * @param exceptionType the exception type that triggers use of {@code fallback}. The exception
   *     type is matched against this step's exception. "This step's exception" means the cause of
   *     the {@link ExecutionException} thrown by {@link Future#get()} on the {@link Future}
   *     underlying this step or, if {@code get()} throws a different kind of exception, that

   * <p>The returned map is not thread-safe or serializable, even if the underlying map is.
   *
   * <p>The function is applied lazily, invoked when needed. This is necessary for the returned map
   * to be a view, but it means that the function will be applied many times for bulk operations
   * like {@link Map#containsValue} and {@code Map.toString()}. For this to perform well, {@code

they've begun asking riddles.--I believe I can guess that,' she
added aloud.

  `Do you mean that you think you can find out the answer to it?'
said the March Hare.

  `Exactly so,' said Alice.

  `Then you should say what you mean,' the March Hare went on.

  `I do,' Alice hastily replied; `at least--at least I mean what
I say--that's the same thing, you know.'

      assertThat(cause)
          .hasMessageThat()
          .contains(
              "AsyncFunction.apply returned null instead of a Future. "
                  + "Did you mean to return immediateFuture(null)?");
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testCatchingAsync_interruptPropagatesToTransformingThread() throws Exception {

      assertThat(cause)
          .hasMessageThat()
          .contains(
              "AsyncFunction.apply returned null instead of a Future. "
                  + "Did you mean to return immediateFuture(null)?");
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testCatchingAsync_interruptPropagatesToTransformingThread() throws Exception {