[dwattttt]

> the only solution is to make everything of one kind

That's not really the case. All you really need is a way to run async code from a sync function; "keep doing this async thing until it's done" is the primitive you need, and some languages/runtimes offer this.

[SkiFire13]

Going by that reasoning then Rust solved the colored function problem too: when calling an `async` function from a sync one use `block_on`, while when calling a sync blocking function from an `async` one use `spawn_blocking`, but somehow people are not happy with this.

[dwattttt]

Yes, it's quite curious. Having used both block_on and spawn_blocking, and not being worried about what "colour" my function is, I am also quite confused about the fuss.

On a practical note, since Rust doesn't standardise on an async runtime, it would be more accurate to say tokio solved the coloured function problem, for whatever that means. Or any and everyone else that made it easy to call one coloured function from another.