[Pyrex] Exception stomping

[Stefan Behnel]

Hi,

Eric Huss wrote:
> I've run into a problem with how Pyrex handles the "current" exception
> (not sure if this has been discussed before).  I know that the "reraise"
> issue has been fixed, but this is a slightly different issue where Pyrex
> does not make a backup of the "current" exception.
> 
> If you call a Pyrex function that internally raises and catches an
> exception, but does not re-raise it, it leaves that exception set within
> the tstate object.  This causes the exception to bleed out in unexpected
> ways.

Please take a look at the way Cython 0.10.1 handles this. It stores the
current exception away when it enters a try block and restores it when an
exception has been caught in an except block and successfully handled (i.e.
the except block has exited normally).

Stefan