[Cython] catched a reference leak problem in try/except block (temp allocation?)

[Stefan Behnel]

Hi Lisandro,

Lisandro Dalcin wrote:
> def gettok(tokens):
>     try:
>         return tokens.pop(0)
>     except IndexError:
>         return None
> 
> I've distilled the problem to this: when the call "tokens.pop(0)"
> actually raises IndexError, then the temporary 1-tuple with item "0"
> (zero) that Cython build in order to make the method call is never
> DECREF'ed; then you leak two references (the 1-tuple plus the integer
> "0").

Thanks for catching this. New style temps were not cleaned up during
exception handling. Should be fixed now.

Stefan