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#![feature(reentrant_lock)]
use std::sync::ReentrantLock;
use std::cell::Cell;
// ReentrantLockGuard<Cell<i32>> must not be Sync, that would be unsound.
fn test_sync<T: Sync>(_t: T) {}
fn main()
{
let m = ReentrantLock::new(Cell::new(0i32));
let guard = m.lock();
test_sync(guard);
//~^ ERROR `Cell<i32>` cannot be shared between threads safely [E0277]
}
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