[issue38765] `ast.AST._attributes` is used by `ast.dump()` but not documented

[Terry J. Reedy]

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

Nosying the ast experts, which I meant to do before.

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nosy: +benjamin.peterson, brett.cannon, yselivanov

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38765>
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