__slots__ may lead to undetected cycles

[loewis]

BPO	519621
Nosy	@gvanrossum, @loewis
Files	a.py

^{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 = 'https://github.com/gvanrossum'
closed_at = <Date 2002-06-04.19:53:50.000>
created_at = <Date 2002-02-18.21:51:01.000>
labels = ['interpreter-core']
title = '__slots__ may lead to undetected cycles'
updated_at = <Date 2002-06-04.19:53:50.000>
user = 'https://github.com/loewis'

bugs.python.org fields:

activity = <Date 2002-06-04.19:53:50.000>
actor = 'gvanrossum'
assignee = 'gvanrossum'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2002-02-18.21:51:01.000>
creator = 'loewis'
dependencies = []
files = ['340']
hgrepos = []
issue_num = 519621
keywords = []
message_count = 2.0
messages = ['9316', '9317']
nosy_count = 2.0
nosy_names = ['gvanrossum', 'loewis']
pr_nums = []
priority = 'high'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue519621'
versions = ['Python 2.3']

[loewis]

Please see the attached script. It should print

Deleting
Deleted
done

[and actually does when you remove the cycle], but prints

Deleting
done

[gvanrossum]

Logged In: YES
user_id=6380

Fixed. I think I'll fix this in 2.2.x too.