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use parking_lot::RwLock;
struct Lock(RwLock<i32>);
#[test]
fn issue_392() {
let lock = Lock(RwLock::new(0));
let mut rl = lock.0.upgradable_read();
rl.with_upgraded(|_| {
println!("lock upgrade");
});
rl.with_upgraded(|_| {
println!("lock upgrade");
});
}