Enable async/await to work on functions that don't just return promises.

[Jerald Cohen]

Florian,

You sure you're not just adding more complexities to a language with
features that were _meant_ to remove such complexity?

Codefined's solution to me seems to be the one with the least amount of
added techniques in order to learn.  Although I understand how co-rountines
are awesome, they can quickly get very confusing when you switch contexts.
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