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
|
#![feature(type_alias_impl_trait)]
//@ edition:2021
//@ check-pass
//@ revisions: tait rpit
struct Pending {}
struct CantOpen {}
trait AsyncRead {}
impl AsyncRead for i32 {}
type PendingReader<'a> = impl AsyncRead + 'a;
#[cfg(tait)]
type OpeningReadFuture<'a> = impl std::future::Future<Output = Result<PendingReader<'a>, CantOpen>>;
impl Pending {
async fn read(&mut self) -> Result<impl AsyncRead + '_, CantOpen> {
Ok(42)
}
#[cfg(tait)]
#[define_opaque(OpeningReadFuture)]
fn read_fut(&mut self) -> OpeningReadFuture<'_> {
self.read()
}
#[cfg(rpit)]
#[define_opaque(PendingReader)]
fn read_fut(
&mut self,
) -> impl std::future::Future<Output = Result<PendingReader<'_>, CantOpen>> {
self.read()
}
}
fn main() {}
|
