I remain unconvinced that red/blue functions are a good thing in a statically compiled language.

If anything, the amount that async/await spirals outward to other areas in Rust demonstrates that it doesn't seem to be a well contained feature.

In addition, async/await executors in Rust quite often fail on corner cases. If I want to only wait on a socket, stuff works great because that's what everybody wants.

If, however, I want to do something like wait on sockets and wait on a character device file descriptor ... that tends to break in fairly mysterious ways.