[issue11549] Rewrite peephole to work on AST

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I've been focusing on softer targets during the sprints - I'll dig into this once I'm back home and using my desktop machine again.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11549>
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