>>lukast+(OP)
When writing some IO bound application, async Rust is great. Less great for libraries that want to support both async and sync without having to make an async runtime a dependency if you just want the sync interface. Mutually exclusive features are taboo unfortunately. One thing I really love about Haskell is you can make any function run in a green thread by simply composing it with the 'async' function. There's nothing special about it. This works much better than say Go, because Haskell is immutable.