Ezio Melotti <ezio.melo...@gmail.com> added the comment:

This whole issue doesn't affect 3.3.

For 2.7/3.2 there are three possible options:
 1) remove constant folding altogether on unicode (this is the solution adopted 
by PyPy);
 2) scan the string up to the index looking for non-BMP chars and disable the 
constant folding if they are found (probably not very efficient);
 3) leave the "buggy" code there (might lead to obscure failures in remote 
cases);

Any opinions?

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versions:  -Python 3.1, Python 3.3

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<http://bugs.python.org/issue5057>
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