async/await improvements

[Kevin Smith]

>
> The only thing they couldn't do (under this proposal) is expose the
> promise being used to userland (to eliminate the chance for userland to
> hold on to the promise and expect to be able to add an error handler at any
> time).
>

And lose the ability to combine the results of async functions with "all",
"race", and any other promise combinator?  That's a core strength of the
current design.
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