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//@ check-pass
//@ edition:2021
#![feature(impl_trait_in_assoc_type)]
use std::future::Future;
use std::marker::PhantomData;
trait Stream {
type Item;
}
struct Empty<T> {
_phantom: PhantomData<T>,
}
impl<T> Stream for Empty<T> {
type Item = T;
}
trait X {
type LineStream<'a, Repr>: Stream<Item = Repr> where Self: 'a;
type LineStreamFut<'a, Repr>: Future<Output = Self::LineStream<'a, Repr>> where Self: 'a;
fn line_stream<'a, Repr>(&'a self) -> Self::LineStreamFut<'a, Repr>;
}
struct Y;
impl X for Y {
type LineStream<'a, Repr> = impl Stream<Item = Repr>;
type LineStreamFut<'a, Repr> = impl Future<Output = Self::LineStream<'a, Repr>>;
fn line_stream<'a, Repr>(&'a self) -> Self::LineStreamFut<'a, Repr> {
async { Empty { _phantom: PhantomData } }
}
}
fn main() {}
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