Stray thought that came up in conversations with @Argorak the other day: what if async closures didn't need the `async` keyword?
The trait would still be AsyncFn (or similar), and that'd be the marker for whether it's an async closure. Unlike `move`, `async` is never optional.
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Usual disclosure: I'm not on the lang team, nor am I a language designer so please interpret this accordingly (:
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