*     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);
  }

   *     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);
  }

HSPLandroidx/arch/core/executor/ArchTaskExecutor;-><init>()V
HSPLandroidx/arch/core/executor/ArchTaskExecutor;->getInstance()Landroidx/arch/core/executor/ArchTaskExecutor;
HSPLandroidx/arch/core/executor/DefaultTaskExecutor$1;-><init>(Landroidx/arch/core/executor/DefaultTaskExecutor;)V
HSPLandroidx/arch/core/executor/DefaultTaskExecutor;-><init>()V
HSPLandroidx/arch/core/executor/DefaultTaskExecutor;->isMainThread()Z
HSPLandroidx/arch/core/executor/TaskExecutor;-><init>()V

        .body("def")
        .throttleBody(1, 750, TimeUnit.MILLISECONDS)
        .build(),
    )
    val call = client.newCall(Request(server.url("/a")))
    val executor = Executors.newSingleThreadExecutor()
    val result = executor.submit<Response?> { call.execute() }
    Thread.sleep(100) // wait for it to go in flight.
    call.cancel()
    assertFailsWith<IOException> {
      result.get()!!.body.bytes()
    }