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

[Chris Jerdonek]

Changes by Chris Jerdonek <chris.jerdonek at gmail.com>:


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keywords: +needs review
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15964>
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