blob: b18635fea3974be764d69c8f4cb675a3f301353c (
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
|
// edition:2018
#![feature(coroutines, coroutine_trait)]
use std::future::Future;
use std::ops::Coroutine;
async fn async_fn() {}
fn returns_async_block() -> impl Future<Output = ()> {
async {}
}
fn returns_coroutine() -> impl Coroutine<(), Yield = (), Return = ()> {
|| {
let _: () = yield ();
}
}
fn takes_future(_f: impl Future<Output = ()>) {}
fn takes_coroutine<ResumeTy>(_g: impl Coroutine<ResumeTy, Yield = (), Return = ()>) {}
fn main() {
// okay:
takes_future(async_fn());
takes_future(returns_async_block());
takes_future(async {});
takes_coroutine(returns_coroutine());
takes_coroutine(|| {
let _: () = yield ();
});
// async futures are not coroutines:
takes_coroutine(async_fn());
//~^ ERROR the trait bound
takes_coroutine(returns_async_block());
//~^ ERROR the trait bound
takes_coroutine(async {});
//~^ ERROR the trait bound
// coroutines are not futures:
takes_future(returns_coroutine());
//~^ ERROR is not a future
takes_future(|ctx| {
//~^ ERROR is not a future
ctx = yield ();
});
}
|
