More of a question really as this was surprising to me.

When using Tokio, you can add #[tokio::main] to any fn and it works as expected, expanding out to eventually calling block_on on a runtime.

I can see https://github.com/async-rs/async-attributes/blob/master/src/lib.rs#L59 and wondered why this restriction is in place? if there's no technical limitation I will happily send a PR 👍

Also whilst here, I noticed that since you expect the attribute to always exist on main, your code doesn't account for visibilty modifiers, eg: pub fn main() would lose the pub

again, if it's just yet to be built then I'd love to help out.

Many thanks for your time.