src/test/resources/freemarker/ext/jsp/webapps/errors/failing-runtime.jsp

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:set var="x" value="${0}" />
<c:forEach var="i" items="${x}">${i}</c:forEach>