1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // MutexGuard<Cell<i32>> must not be Sync, that would be unsound.
15 fn test_sync<T: Sync>(_t: T) {}
19 let m = Mutex::new(Cell::new(0i32));
20 let guard = m.lock().unwrap();
22 //~^ ERROR `std::cell::Cell<i32>` cannot be shared between threads safely [E0277]