Help with static lifetime on self when using async

[Yandros]

Yes, that's the solution when you are not using one of the arguments of the function (in this case, self) within the Future / async part:

@https://github.com/rust-lang/rfcs/blob/master/text/2394-async_await.md#initialization-pattern

"Initialization" pattern

One pattern that sometimes occurs is that a future has an "initialization" step which should be performed during its construction. This is useful when dealing with data conversion and temporary borrows. Because the async function does not begin evaluating until you poll it, and it captures the lifetimes of its arguments, this pattern cannot be expressed directly with an async fn.

One option is to write a function that returns impl Future using a closure which is evaluated immediately:

// only arg1's lifetime is captured in the returned future
fn foo<'a>(arg1: &'a str, arg2: &str) -> impl Future<Output = usize> + 'a {
    // do some initialization using arg2

    // closure which is evaluated immediately
    async move {
         // asynchronous portion of the function
    }
}