Rust has channels in its standard library. Admittedly, they do not have the same functionality as Go's concurrency primitives. The two most significant omissions are probably a multi-producer/multi-consumer channel and a more complete (and stable) `select` construct.

There is also my `chan` library, which replicates Go functionality with respect to channels: http://burntsushi.net/rustdoc/chan/ --- Notably, you still have to use native threads.

Your `libmill` example is a coroutine library with a scheduler and everything. That is definitely too much runtime for standard Rust. However, there are people working on coroutines in Rust, on which something like `libmill` could be built: https://crates.io/search?q=coroutine