Has the language team (or anyone else) carried out an experiment to convert existing code to async/await using one or more of the proposed syntaxes? This is probably a lot of work to do, but might be worth it in this specific case in order to find out how it actually feels to use each of these syntaxes. e.g., It might turn out that await? foo() actually makes a lot of sense and that the value of chaining is less than one thought.
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