[issue12878] io.StringIO doesn't provide a __dict__ field

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Actually it already fails with 3.1 (I tried "hg up v3.1")
Then I played with "hg bisect", and unsurprisingly it answered:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: '_io.StringIO' object has no attribute '__dict__'
Changeset 51991:3049ac17e256: bad
The first bad revision is:
changeset:   51991:3049ac17e256
user:        Benjamin Peterson <benjamin at python.org>
date:        Wed Mar 04 00:14:51 2009 +0000
summary:     merge the io-c branch: C implementation of the io module

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12878>
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