相关疑难解决方法(0)

use futures::{future, Future};

fn test() -> Box<dyn Future<Output = bool>> {
    Box::new(future::ok::<bool>(true))
}

async fn async_fn() -> bool {
    let result: bool = test().await;
    return result;
}

fn main(){
    async_fn();
    println!("Hello!");
}

操场

错误：

use futures::{future, Future};

fn test() -> Box<dyn Future<Output = bool>> {
    Box::new(future::ok::<bool>(true))
}

async fn async_fn() -> bool {
    let result: bool = test().await;
    return result;
}

fn main(){
    async_fn();
    println!("Hello!");
}