return getSupertypeFromUpperBounds(superclass, ((TypeVariable<?>) runtimeType).getBounds());
    }
    if (runtimeType instanceof WildcardType) {
      return getSupertypeFromUpperBounds(superclass, ((WildcardType) runtimeType).getUpperBounds());
    }
    if (superclass.isArray()) {
      return getArraySupertype(superclass);
    }
    @SuppressWarnings("unchecked") // resolved supertype

   * InternalFutures#tryInternalFastPathGetFailure(InternalFutureFailureAccess)}.
   *
   * @since 27.0
   */
  @Override
  /*
   * We should annotate the superclass, InternalFutureFailureAccess, to say that its copy of this
   * method returns @Nullable, too. However, we're not sure if we want to make any changes to that