SystemError accessing uninitialised cell contents

[kupuguy]

BPO	1445
Nosy	@gvanrossum, @kupuguy, @amauryfa

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2007-11-24.13:54:26.982>
created_at = <Date 2007-11-15.10:27:48.220>
labels = ['interpreter-core', 'type-bug']
title = 'SystemError accessing uninitialised cell contents'
updated_at = <Date 2007-11-24.13:54:26.898>
user = 'https://github.com/kupuguy'

bugs.python.org fields:

activity = <Date 2007-11-24.13:54:26.898>
actor = 'amaury.forgeotdarc'
assignee = 'none'
closed = True
closed_date = <Date 2007-11-24.13:54:26.982>
closer = 'amaury.forgeotdarc'
components = ['Interpreter Core']
creation = <Date 2007-11-15.10:27:48.220>
creator = 'duncanb'
dependencies = []
files = []
hgrepos = []
issue_num = 1445
keywords = []
message_count = 3.0
messages = ['57525', '57559', '57805']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'duncanb', 'amaury.forgeotdarc']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue1445'
versions = ['Python 2.6', 'Python 2.5']

[kupuguy]

The following code throws a SystemError exception. cell_get_contents in
Objects\cellobject.c should check for a null op->ob_ref value and throw
an appropriate exception.

>>> def oops():
	def f(): cell
	f.func_closure[0].cell_contents
	cell = None

>> oops()

Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    oops()
  File "<pyshell#8>", line 3, in oops
    f.func_closure[0].cell_contents
SystemError: error return without exception set
>>>

[gvanrossum]

Patch anyone?

[amauryfa]

Fixed in r59170 (trunk) and r59171 (release25-maint).