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// edition: 2021
// check-pass
#![feature(async_fn_in_trait)]
#![feature(return_position_impl_trait_in_trait)]
#![allow(incomplete_features)]
use std::future::Future;
use std::marker::PhantomData;
trait Lockable<K, V> {
async fn lock_all_entries(&self) -> impl Future<Output = Guard<'_>>;
}
struct Guard<'a>(PhantomData<&'a ()>);
fn main() {}
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