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fn require_sync<T: Sync>() {}
//~^ NOTE required by this bound in `require_sync`
//~| NOTE required by a bound in `require_sync`
fn main() {
require_sync::<std::cell::OnceCell<()>>();
//~^ ERROR `OnceCell<()>` cannot be shared between threads safely
//~| NOTE `OnceCell<()>` cannot be shared between threads safely
//~| NOTE use `std::sync::OnceLock` instead
}
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