Assertion failed while using function handles

Hi,
After I updated my engine project to the latest WIP version of AngelScript I could successfully run my base testbed.
However I had a minor issue while trying to run Magic Portals with the updated version of AngelScript:

Assertion failed: (calledFunc), function AdjustGetOffset, file /../../../../source/as_restore.cpp, line 3471.

I could isolate the issue and reproduce it in a smaller excerpt:
[source lang="java"]class Foo
{
int a;
}

class Bar
{
float b;
}

funcdef void TEST_FUNC_HANDLE(Foo, Bar);

void testFunction(TEST_FUNC_HANDLE@ func)
{
func(Foo(), Bar());
}[/source]
It appears that the assertion fails while trying to save the bytecode for testFunction. Am I doing anything silly?