#![feature(async_await, futures_api)]

use std::future::Future;

async fn func() -> Result<(), ()> {
    Ok(())
}

trait MyTrait {
    type Future: Future;
    fn start(&mut self) -> Self::Future;
}

impl<F: Future> MyTrait for fn() -> F {
    type Future = F;
    fn start(&mut self) -> Self::Future {
        (self)()
    }
}

fn main() {
    //let f: () = func;
    use_my_trait(func)
}

fn use_my_trait<T: MyTrait>(t: T) {}