static class ExecutorSpy implements Executor {

    Executor delegate;
    boolean wasExecuted;

    public ExecutorSpy(Executor delegate) {
      this.delegate = delegate;
    }

    @Override
    public void execute(Runnable command) {
      delegate.execute(command);
      wasExecuted = true;
    }
  }

  public void testTransform_Executor() throws Exception {

  static class ExecutorSpy implements Executor {

    Executor delegate;
    boolean wasExecuted;

    public ExecutorSpy(Executor delegate) {
      this.delegate = delegate;
    }

    @Override
    public void execute(Runnable command) {
      delegate.execute(command);
      wasExecuted = true;
    }
  }

  public void testTransform_Executor() throws Exception {

going down on one knee as he spoke, `we were trying--'

  `I see!' said the Queen, who had meanwhile been examining the
roses.  `Off with their heads!' and the procession moved on,
three of the soldiers remaining behind to execute the unfortunate
gardeners, who ran to Alice for protection.

  `You shan't be beheaded!' said Alice, and she put them into a
large flower-pot that stood near.  The three soldiers wandered

   *     exception itself.
   * @param executor the executor that runs {@code fallback} if the input fails
   */
  public <X extends Throwable> ClosingFuture<V> catching(
      Class<X> exceptionType, ClosingFunction<? super X, ? extends V> fallback, Executor executor) {
    return catchingMoreGeneric(exceptionType, fallback, executor);
  }

going down on one knee as he spoke, `we were trying--'

  `I see!' said the Queen, who had meanwhile been examining the
roses.  `Off with their heads!' and the procession moved on,
three of the soldiers remaining behind to execute the unfortunate
gardeners, who ran to Alice for protection.

  `You shan't be beheaded!' said Alice, and she put them into a
large flower-pot that stood near.  The three soldiers wandered