code: public void forEachFlattened (@Nonnull final Consumer <? super IError> aConsumer)
    {
      for (final ValidationResult aItem : this)
        aItem.getErrorList ().forEach (aConsumer);
    }
docs: Invoke the provided consumer on all items.
  
  @param aConsumer
  Consumer to be invoked for each {@link IError}. May not be
  <code>null</code>.
  @since 4.0.0