[issue40759] Deprecate the symbol module

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

If PEG does not use this file, then not deprecating it along with parser in 3.9 could be considered a bug.

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nosy: +terry.reedy

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40759>
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