private static final class RecordingSubscriberExceptionHandler
      implements SubscriberExceptionHandler {
    private SubscriberExceptionContext context;
    private Throwable exception;

    @Override
    public void handleException(Throwable exception, SubscriberExceptionContext context) {
      this.exception = exception;
      this.context = context;
    }
  }

      if (e.getCause() instanceof Error) {
        throw (Error) e.getCause();
      }
      throw e;
    }
  }

  /** Gets the context for the given event. */
  private SubscriberExceptionContext context(Object event) {
    return new SubscriberExceptionContext(bus, event, target, method);
  }

  @Override
  public final int hashCode() {
    return (31 + method.hashCode()) * 31 + System.identityHashCode(target);
  }