[issue17490] Use converter functions to implement ast.literal_eval

[Nick Coghlan]

Nick Coghlan added the comment:

Now that I've actually implemented it, I'm fairly sure it's not a good idea. It might be better if we remove the recursive behaviour.

As it is, Larry's fairly happy with what he is already doing (calling ast.parse and walking the tree) and I think that's actually simpler than using this API would be.

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<http://bugs.python.org/issue17490>
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