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A recursive async fn has an infinitely sized future, so the compiler asks for indirection. Return a boxed future with Box::pin, or use the async-recursion crate, and prefer a loop when you can.
async and await are syntax over futures. Learn what async blocks capture, where await may appear, how errors and ? work, and the common first mistakes.
An async fn compiles to a state machine that implements Future. See the generated shape, what poll does, and why a future does nothing until it is polled.
A guide to async Rust and Tokio: futures, the runtime, spawning, blocking, channels and the mistakes that make a service stop answering.