TYPO3.Fluid

The current DocBlock says:

 * <f:form.validationResults>
 *   <f:if condition="{validationResults.flattenedErrors}">
 *     <ul class="errors">
 *       <f:for each="{errors}" as="error">
 *         <li>{error.code}: {error}</li>
 *       </f:for>
 *     </ul>
 *   </f:if>
 * </f:form.validationResults>

(see the comment at the getFlattenedErrors() function:
Get a list of all Error objects recursively. The result is an array,
where the key is the property path where the error occured, and the
value is a list of all errors (stored as array))

so due to that error result nesting, it should read:

<f:form.validationResults>
    <f:if condition="{validationResults.flattenedErrors}">
        <dl class="errors">
            <f:for each="{validationResults.flattenedErrors}" as="errors" key="propertyPath">
                <dt>{propertyPath}</dt>
                <dd><dl>
                    <f:for each="{errors}" as="error">
                        <dt>{error.code}</dt>
                        <dd>{error}</dd>
                    </f:for>
                </dl></dd>
            </f:for>
        </dl>
    </f:if>
</f:form.validationResults>

(disregard the fact that I use dl's here, although I like them more when it comes to nestings)