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bpo-41808: Add What's New 3.9 entry missing from master (#22294) 

Entry was added by bpo-40939, #21012 and #21039.
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Terry Jan Reedy 2020-09-17 21:56:58 -04:00 committed by GitHub
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Doc/whatsnew/3.9.rst
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@ -708,6 +708,11 @@ Deprecated
users can leverage the Abstract Syntax Tree (AST) generation and compilation
stage, using the :mod:`ast` module.
* The Public C API functions :c:func:`PyParser_SimpleParseStringFlags`,
:c:func:`PyParser_SimpleParseStringFlagsFilename`,
:c:func:`PyParser_SimpleParseFileFlags` and :c:func:`PyNode_Compile`
are deprecated and will be removed in Python 3.10 together with the old parser.
* Using :data:`NotImplemented` in a boolean context has been deprecated,
as it is almost exclusively the result of incorrect rich comparator
implementations. It will be made a :exc:`TypeError` in a future version