[stringtemplate-interest] One more glitch: $it$ in templates invoked on multiple lists

[Roman Odaisky]

Given:

template_v.st
...$v.(a)$...$a$...$b$...

template_it.st
...$it.(a)$...$a$...$b$...

This works:

$[list1], [list2]:{a, b | $template_v(v=var, a=a, b=b)$}

This doesn’t:

$[list1], [list2]:{a, b | $var:template_it(a=a, b=b)$}

The second case results in something that resembles a Cartesian product of the 
lists.

In my case, var is a django.forms.ModelForm, and I’ve hacked PyST where it 
tests for isinstance(o, dict) to look for __getitem__ instead, to support 
dict-like objects that are not dict. I wanted to have

$["field1", "field2"], ["Field 1", "Field2"]:{name,title|
$form:label_and_input(name=name, title=title)$}$

which only works if form becomes a named parameter.

StringTemplate 3.1 for Python.

-- 
WBR
Roman.
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