[issue29463] Add `docstring` field to AST nodes

[INADA Naoki]

INADA Naoki added the comment:

Thanks.  I don't familiar with language frontend.
I'll check NEWS entry.

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title: Add `docstring` attribute to AST nodes -> Add `docstring` field to AST nodes

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29463>
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