Push to for_stack at the beginning of For#render

test/integration/tags/for_tag_test.rb

@@ -313,6 +313,10 @@ HERE
       'outer' => [[1, 1, 1], [1, 1, 1]])
   end
 
+  def test_inner_for_over_empty_input
+    assert_template_result 'oo', '{% for a in (1..2) %}o{% for b in empty %}{% endfor %}{% endfor %}'
+  end
+
   def test_blank_string_not_iterable
     assert_template_result('', "{% for char in characters %}I WILL NOT BE OUTPUT{% endfor %}", 'characters' => '')
   end