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use std::collections::{HashMap, HashSet};
use std::hash::{Hash, Hasher};
use std::sync::atomic::{AtomicUsize, Ordering::Relaxed};
struct Key(AtomicUsize);
impl Clone for Key {
fn clone(&self) -> Self {
Key(AtomicUsize::new(self.0.load(Relaxed)))
}
}
impl PartialEq for Key {
fn eq(&self, other: &Self) -> bool {
self.0.load(Relaxed) == other.0.load(Relaxed)
}
}
impl Eq for Key {}
impl Hash for Key {
fn hash<H: Hasher>(&self, h: &mut H) {
self.0.load(Relaxed).hash(h);
}
}
fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
let _other: HashMap<Key, bool> = HashMap::new();
m.keys().cloned().collect()
}
fn this_is_ok(_m: &mut HashMap<usize, Key>) {}
#[allow(unused)]
trait Trait {
type AssociatedType;
fn trait_fn(&self, set: std::collections::HashSet<Self::AssociatedType>);
}
fn generics_are_ok_too<K>(_m: &mut HashSet<K>) {
// nothing to see here, move along
}
fn tuples<U>(_m: &mut HashMap<((), U), ()>) {}
fn tuples_bad<U>(_m: &mut HashMap<(Key, U), bool>) {}
fn main() {
let _ = should_not_take_this_arg(&mut HashMap::new(), 1);
this_is_ok(&mut HashMap::new());
tuples::<Key>(&mut HashMap::new());
tuples::<()>(&mut HashMap::new());
tuples_bad::<()>(&mut HashMap::new());
}
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