[Stackless] Stackless for Python 2.5b2 / help required

[Jeff Senn]

Richard Tew wrote:
> Hi,
> 
> I've been working the last few issues out of the Stackless
> 2.5 port, and there are two things which I would
> appreciate some help with:
> 
> 1) Testing it.  Get the latest from the Stackless trunk at

Seems to pass everything on OS-X except for the problems you mention.

> 2) Helping fix the last remaining bug.  I've been
> debugging the problem with test_contextlib quite a

Here's what I get:

======================================================================
ERROR: test_nested_b_swallows (__main__.NestedTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
   File "lib/test/test_contextlib.py", line 185, in test_nested_b_swallows
     1/0
   File "/Users/senn/src/stackless/Python-2.5b1/Lib/contextlib.py", line 29, in 
__exit__
     self.gen.throw(type, value, traceback)
   File "/Users/senn/src/stackless/Python-2.5b1/Lib/contextlib.py", line 121, in 
nested
     if exit(*exc):
   File "/Users/senn/src/stackless/Python-2.5b1/Lib/contextlib.py", line 22, in 
__exit__
     self.gen.next()
   File "lib/test/test_contextlib.py", line 175, in a
     yield
SystemError: error return without exception set


I haven't had a chance to look in depth (I'm betting it has something to
do with more than one pending exception being on the stack of generators and 
getting lost in the unwinding -- perhaps the StopIteration or GeneratorExit).

Here is *much* more minimal case that fails in nearly the same way
(hope this helps... I don't have enough time to lend a hand at the moment):

def gen(): yield

def bar():
     a = gen()
     b = gen()
     try:
	yield
     finally:
	b.next()

bar().next()


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