--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 ['items' => ['a' => ['a1', 'a2', 'a3'], 'b' => ['b1']]]
--EXPECT--
* a (2):
  * a1 (3)
  * a2 (3)
  * a3 (3)
* b (2):
  * b1 (1)
