[docs] [issue12207] Document ast.PyCF_ONLY_AST

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

Use of PyCF_ONLY_AST be superseded by ast.parse.

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nosy: +benjamin.peterson
priority: normal -> low

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12207>
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