Introducing ClosureChains to avoid "completion hell"

[Cyberbeni (Benedek Kozma)]

I don't want to be the bringer of bad news but async/await is already available in preview and might make your project deprecated: swift-evolution/0296-async-await.md at main · apple/swift-evolution (github.com)

[Pitch #2] Async/await

What is the simplest asynchronous context where I can start playing with async/await? It depends on your definition of "playing with" :) If you're happy to write code against the model and see how it type-checks to get a feel for things, then grab a main snapshot from swift.org and go ahead. The type checker implementation (behind -Xfrontend -enable-experimental-concurrency) is very close to what's in the proposal, with a few stragglers for recent changes. If you want to actually execute s…