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They intentionally removed green threading from Rust long ago, so I would guess they intend to leave it outside core? https://github.com/rust-lang/rfcs/blob/08

• lmm 9y ago
  I think the intention is that userspace schedulers (event loops) will remain outside of core, but core will potentially contain a task interface and know how to form tasks (but not necessarily offer any way to execute them asynchronously) so that there can be better integration of ownership/borrow checking with async tasks? But I haven't been following that closely.
  • steveklabnik 9y ago
    Yes, this is basically correct. There's an open RFC to add futures to libcore; https://github.com/rust-lang/rfcs/pull/2395 https://github.com/rust-lang/rfcs/pull/2395 But we have no plans on pulling anything more than that in. > so that there can be better integration of ownership/borrow checking with async tasks? It's more about conventions and stability; traits are a great thing to put in the stdlib so the entire ecosystem can use them as an interface.