mirror of https://github.com/rust-lang/rust
35 lines
497 B
Rust
35 lines
497 B
Rust
//@ check-pass
|
|
//@ edition: 2021
|
|
|
|
use std::marker::PhantomData;
|
|
|
|
pub struct Struct<I, T>(PhantomData<fn() -> <Self as It>::Item>)
|
|
where
|
|
Self: It;
|
|
|
|
impl<I> It for Struct<I, I::Item>
|
|
where
|
|
I: It,
|
|
{
|
|
type Item = ();
|
|
}
|
|
|
|
pub trait It {
|
|
type Item;
|
|
}
|
|
|
|
fn f() -> impl Send {
|
|
async {
|
|
let _x = Struct::<Empty<&'static ()>, _>(PhantomData);
|
|
async {}.await;
|
|
}
|
|
}
|
|
|
|
pub struct Empty<T>(PhantomData<fn() -> T>);
|
|
|
|
impl<T> It for Empty<T> {
|
|
type Item = T;
|
|
}
|
|
|
|
fn main() {}
|