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
|
//@ check-pass
//@ edition: 2021
// issue: 113796
trait AsyncLendingIterator {
type Item<'a>
where
Self: 'a;
#[allow(async_fn_in_trait)]
async fn next(&mut self) -> Option<Self::Item<'_>>;
}
struct Lend<I>(I);
impl<I> AsyncLendingIterator for Lend<I> {
type Item<'a> = &'a I
where
Self: 'a;
// Checking that the synthetic `<Self as AsyncLendingIterator>::next()` GAT
// is well-formed requires being able to assume the WF types of `next`.
async fn next(&mut self) -> Option<Self::Item<'_>> {
todo!()
}
}
fn main() {}
|
