--TEST--
"filter" tag applies the filter on "for" tags
--DEPRECATION--
The "filter" tag is deprecated since Twig 2.9, use the "apply" tag instead.
--TEMPLATE--
{% filter upper %}
{% for item in items %}
{{ item }}
{% endfor %}
{% endfilter %}
--DATA--
return ['items' => ['a', 'b']]
--EXPECT--
A
B
