}

  public void testSetFailure() throws Exception {
    assertTrue(future.setException(new Exception("failure")));
    tester.testFailedFuture("failure");
  }

  public void testSetFailureNull() throws Exception {
    assertThrows(NullPointerException.class, () -> future.setException(null));
    assertFalse(future.isDone());
    assertTrue(future.setException(new Exception("failure")));
    tester.testFailedFuture("failure");
  }

  @CanIgnoreReturnValue
  @Override
  public boolean set(@ParametricNullness V value) {
    return super.set(value);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean setException(Throwable throwable) {
    return super.setException(throwable);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean setFuture(ListenableFuture<? extends V> future) {
    return super.setFuture(future);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean set(@ParametricNullness V value) {
    return super.set(value);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean setException(Throwable throwable) {
    return super.setException(throwable);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean setFuture(ListenableFuture<? extends V> future) {
    return super.setFuture(future);
  }

     * thread immediately fails with the same exception:
     *
     * Thread1: calls setException(), which returns true, context switch before it can CAS
     * seenExceptionsField to its exception
     *
     * Thread2: calls setException(), which returns false, CASes seenExceptionsField to its
     * exception, and wrongly believes that its exception is new (leading it to logging it when it

    return new UncheckedThrowingFuture<V>();
  }

  public void complete(RuntimeException e) {
    if (!super.setException(new WrapperException(checkNotNull(e)))) {
      throw new IllegalStateException("Future was already complete: " + this);
    }
  }

  public void complete(Error e) {
    if (!super.setException(new WrapperException(checkNotNull(e)))) {
      throw new IllegalStateException("Future was already complete: " + this);

      case NOT_DONE:
        break;
      case FINISHED:
        f.set(null);
        break;
      case CANCELLED:
        f.cancel(false);
        break;
      case FAILED:
        f.setException(new Exception());
        break;
    }
    return f;
  }

    void afterRanInterruptiblySuccess(@ParametricNullness V result) {
      TrustedListenableFutureTask.this.set(result);
    }

    @Override
    void afterRanInterruptiblyFailure(Throwable error) {
      setException(error);
    }

    @Override
    String toPendingString() {
      return callable.toString();
    }
  }

  @WeakOuter
  private final class TrustedFutureInterruptibleAsyncTask

       * class with a manual reference back to the "containing" class.)
       *
       * This has the nice-ish side effect of limiting reentrancy: run() calls
       * timeoutFuture.setException() calls run(). That reentrancy would already be harmless, since
       * timeoutFuture can be set (and delegate cancelled) only once. (And "set only once" is

  }

  static final class ImmediateFailedFuture<V extends @Nullable Object> extends TrustedFuture<V> {
    ImmediateFailedFuture(Throwable thrown) {
      setException(thrown);
    }
  }

  static final class ImmediateCancelledFuture<V extends @Nullable Object> extends TrustedFuture<V> {
    static final @Nullable ImmediateCancelledFuture<Object> INSTANCE =

    SettableFuture<String> f = SettableFuture.create();
    Exception e = new IllegalArgumentException("foo not found");
    MockCallback callback = new MockCallback(e);
    addCallback(f, callback, directExecutor());
    f.setException(e);
  }

  public void testCancel() {
    SettableFuture<String> f = SettableFuture.create();
    FutureCallback<String> callback =
        new FutureCallback<String>() {