[issue39686] add dump_json to ast module

[Richard K]

Change by Richard K <qpotizo at gmail.com>:


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keywords: +patch
pull_requests: +17938
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18558

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39686>
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