[Cython] Prototype patch for closures/inner functions

[Dag Sverre Seljebotn]

>
> Known fatal bugs:
> - I don't know the first thing about reference counting, CPython etc.. 
> At least on one occasion I messed up GC-ing. This is probably 
> something that others will be much quicker at spotting.
> - No name mangling, inner functions cannot collide in name with outer. 
> Quick fix but don't have time now; also one might want a more generic 
> "name mangler" support mechanism rather than just checking for 
> collisions, not sure about how to do this.
> - No consideration for anything nontrivial: The global keyword and 
> accessing variables in modules comes to mind.


Add this one:

- If the inner function calls cdef functions, one will have problems 
because it will try to include the name of the cdef function in the closure.

I guess this really wasn't that ready. But as I said, I have to take a 
break and better to post anything at all. +, if I'm heading in the wrong 
direction (scope is already calculated...) someone can help me out.

-- 
Dag Sverre