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//@ edition: 2021
fn main() {
let _ = async {
A.first().await.second().await;
};
}
pub trait First {
type Second: Second;
async fn first(self) -> Self::Second;
}
struct A;
impl First for A {
type Second = A;
async fn first(self) -> Self::Second {
A
}
}
pub trait Second {
async fn second(self);
}
impl<C> Second for C
where
C: First,
{
async fn second(self) {
//~^ ERROR recursion in an async fn requires boxing
self.first().await.second().await;
}
}
|
