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Re:Zero-cost futures in Rust by pcwalton on Thursday August 11, 2016 @12:23PM (#12269532)
It's a new feature (hopefully to be merged this week). Here are the gory details:

https://github.com/rust-lang/rfcs/blob/master/text/1522-cons...

Re:Zero-cost futures in Rust by kibwen on Thursday August 11, 2016 @12:26PM (#12269569)
Worth noting that by "hopefully to be merged this week" we mean that this initial prototype implementation will land in nightly: https://github.com/rust-lang/rust/pull/35091 . It's not being stabilized this week.