blob: f61b34ed99e00b56cad0c4ff3432fbe38bdbc3bf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
// check-pass
// edition:2021
#![feature(async_fn_in_trait)]
#![allow(incomplete_features)]
use std::future::Future;
async fn yield_now() {}
trait AsyncIterator {
type Item;
async fn next(&mut self) -> Option<Self::Item>;
}
struct YieldingRange {
counter: u32,
stop: u32,
}
impl AsyncIterator for YieldingRange {
type Item = u32;
async fn next(&mut self) -> Option<Self::Item> {
if self.counter == self.stop {
None
} else {
let c = self.counter;
self.counter += 1;
yield_now().await;
Some(c)
}
}
}
async fn async_main() {
let mut x = YieldingRange { counter: 0, stop: 10 };
while let Some(v) = x.next().await {
println!("Hi: {v}");
}
}
fn main() {
let _ = async_main();
}
|
