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A comment on Why async fn in traits are hard. Parent comment

Re:Why async fn in traits are hard by endless1234 on Sunday October 27, 2019 @04:51AM (#21368557)
But isn't a Promise for all intents and purposes the same as a Future here?
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Re:Why async fn in traits are hard by marcoms on Sunday October 27, 2019 @07:13AM (#21369035)
Yes, but I think they are emphasising that only a promise will be returned. Any further type information is not given
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