[issue11549] Rewrite peephole to work on AST

[Eugene Toder]

Eugene Toder <eltoder at gmail.com> added the comment:

> and with __future__ it should work on 2.5 as well.
Actually, seems that at least str.format is not in 2.5 as well. Still the question is should I make it run on 2.5 or 2.4 or is 2.6 OK (then __future__ can be removed).

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<http://bugs.python.org/issue11549>
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