[issue9621] Graphviz output for 2to3 fixer patterns

[Matt Bond]

Matt Bond <gmattbond at gmail.com> added the comment:

As requested, attached is the output for the fix_buffer fixer, as an example of the kind of output this patch can produce.

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Added file: http://bugs.python.org/file18968/fix_buf_pytree_1.png

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