[issue2431] 2to3 is rather slow

[David Wolever]

David Wolever <wolever at cs.toronto.edu> added the comment:

Martin and I talked about this, and I'm going to try loading the first 
node of each tree generated by the PATTERNs into a dictionary, then when 
the tree is walked, only fixers which could potentially match the current 
node are executed.

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assignee: collinwinter -> David Wolever

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