This is just the lazy way of handling tasks. Rust allows you to join two futures, and awaiting on the resulting future will run the underlying two in parallel a

This is just the lazy way of handling tasks. Rust allows you to join two futures, and awaiting on the resulting future will run the underlying two in parallel and wait for them. In a language like Haskell where everything in lazy, it's not uncommon for someone to model their logic in such a way that computations that are not necessary are never run but appear to be used in code anyway. Depending on what you want to do, it's also possible to start threads/green-threads (using something like Tokio), and use message passing for async tasks where you do not need to process the result synchronously.