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fn require_sync<T: Sync>() {}
//~^ NOTE required by this bound in `require_sync`
//~| NOTE required by this bound in `require_sync`
//~| NOTE required by this bound in `require_sync`
//~| NOTE required by this bound in `require_sync`
//~| NOTE required by a bound in `require_sync`
//~| NOTE required by a bound in `require_sync`
//~| NOTE required by a bound in `require_sync`
//~| NOTE required by a bound in `require_sync`
fn main() {
require_sync::<std::cell::Cell<()>>();
//~^ ERROR `Cell<()>` cannot be shared between threads safely
//~| NOTE `Cell<()>` cannot be shared between threads safely
//~| NOTE if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock`
require_sync::<std::cell::Cell<u8>>();
//~^ ERROR `Cell<u8>` cannot be shared between threads safely
//~| NOTE `Cell<u8>` cannot be shared between threads safely
//~| NOTE if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicU8` instead
require_sync::<std::cell::Cell<i32>>();
//~^ ERROR `Cell<i32>` cannot be shared between threads safely
//~| NOTE `Cell<i32>` cannot be shared between threads safely
//~| NOTE if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicI32` instead
require_sync::<std::cell::Cell<bool>>();
//~^ ERROR `Cell<bool>` cannot be shared between threads safely
//~| NOTE `Cell<bool>` cannot be shared between threads safely
//~| NOTE if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicBool` instead
}
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