UndefinedError if output from template function is wrapped in tuple

[fschwarz]

This template causes an exception: "UndefinedError: "name" not defined"

<doc xmlns:py="http://genshi.edgewall.org/">
   <py:def function="foo(name)">__${name}__</py:def>
   ${tuple(foo('bar'))}
</doc>

Once the 'tuple()' is removed everything works as expected. I found the error message very confusing as undefined variables don't have anything to do with return values of a function.

[fschwarz]

test case

[fschwarz]

I also observed that this bug is triggered in general when you try to iterate over the returned function iterator. Also a list() or even [i for i in foo('bar') exhibits the same behavior.

[hodgestar]

Moved to milestone 0.9.