Thanks! Sounds interesting, but it's not obvious to me that such a framework can't be captured in the Rust type/ownership system in a reasonably ergonomic way.

Thanks! Sounds interesting, but it's not obvious to me that such a framework can't be captured in the Rust type/ownership system in a reasonably ergonomic way. Has anyone even tried doing that? For example you might be able to wrap shared-mutable state in a kind of degenerate mutex and pass a "scheduler guarantee" token around that unlocks those "mutexes" without doing any runtime work.