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> Just to quickly touch on Matthias' question about opt-in or deprecations, a key thing to note is the ast module is automatically generated from the ASDL file, so either of those approaches would require developing a new mechanism in the code generator to support either approach.
Yes, I was mostly thinking of `compile(..., mode, flags=PyAstOnly)` as to where the deprecation could be. 
Thinking a bit more about the `compile`'s `multiline` option, that would also be quite useful to allow some construct that are so far forbidden, like top-level `await`.
I'm thinking that splitting `exec` into two options:
 - `module` which could do what current 3.7 does and find docstrings plus do some optimisation and sanity check if necessary, prevent top-level await. 
 - `multiline` which would treat the source as a sequence of statement, allwo top level `await` ... etc.
this could allow both to evolve and have their individual advantage, leaving `exec` unchanged for legacy reasons.