Nested foreach-statements in templates

Have been trying to do this in flexy for a while, but it does not seem
to support it. I have an array of categories of which each contains an
array of things. So I'd like the template to look like this.
{foreach:categories,category}
{foreach:category,thing}
{thing->someField}...
{end:}
{end:}
Now it seems that flexy does not translate any flexy "statements"
inside a foreach-statement. So it does not work in this way.
The poster here http://pear.php.net/bugs/bug.php?id=3024 seems to say
it's supposed to work, but he does not seem entirely sure.
In steps 10 and 11 here
http://www.akbkhome.com/blog.php/View/121/Getting_Started_wi th_HTML_FlexyFramework_DataObjects_and_HTML_Template_Flexy.h tml
the writer says that it does not work with templates and he recommends
putting in a method that spits out html-tagged data. This makes it a
bit more difficult to tell what the end result is going to be by
reading only the template. Although I'll probably go for this approach
now.
Just wondered if anyone knew if it's still possible to do it with
flexy somehow. Or if another template engine supports it.