[issue17515] Add sys.setasthook() to allow to use a custom AST optimizer

[Brett Cannon]

Brett Cannon added the comment:

This is unnecessary. I added the source_to_code() method (http://docs.python.org/3.4/library/importlib.html#importlib.abc.SourceLoader.source_to_code) to loaders to explicitly handle this case.

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<http://bugs.python.org/issue17515>
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