[PyQt] Easy Segfault using (or misusing) QTextStream

[David Cortesi]

I was experimenting to see if I could make an in-memory QTextStream and
discovered instead an easy way to make Python 2.7.3 segfault:

[08:23] python
Python 2.7.3 (v2.7.3:70274d53c1dd, Apr  9 2012, 20:52:43)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt4.QtCore import (Qt, QString, QTextStream)
>>> ts = QTextStream(QString())
>>> ts << u'x'
Segmentation fault

The above is on OSX 10.6, but exactly the same result happens in Ubuntu 12.

It's probably mis-use of the QTextStream (*can* one build a text stream in
memory, rewind it and read it back?) but cratering the interpreter seems a
bit harsh...
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