--TEST--
"for" tags can be nested
--TEMPLATE--
{% for key, item in items %}
* {{ key }} ({{ loop.length }}):
{% for value in item %}
  * {{ value }} ({{ loop.length }})
{% endfor %}
{% endfor %}
--DATA--
return array('items' => array('a' => array('a1', 'a2', 'a3'), 'b' => array('b1')))
--EXPECT--
* a (2):
  * a1 (3)
  * a2 (3)
  * a3 (3)
* b (2):
  * b1 (1)