[docs] [issue15964] SyntaxError in asdl when building 2.7 with system Python 3

[Roger Serwy]

Roger Serwy added the comment:

The attached patch allows the same parser code to run under Python 2 and Python 3. I'm not sure how to test it other than by running the test suite which passed.

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Added file: http://bugs.python.org/file29677/patch_2and3.py

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