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When you await an async function, the compiler doesn’t necessarily allocate a new object on the heap or introduce dynamic dispatch (you’d rarely Box the future). What happens is that it merges the callee’s state into the parent Future’s state machine. That can make the abstraction genuinely free: your async future gets flattened into the callee’s state machine. The extra await point you’re worried about may compile down to the same state transitions the inline version would have produced anyway.
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