src/test/ui/generator/not-send-sync.rs

// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(generators)]

use std::cell::Cell;

fn main() {
    fn assert_sync<T: Sync>(_: T) {}
    fn assert_send<T: Send>(_: T) {}

    assert_sync(|| {
        //~^ ERROR: E0277
        let a = Cell::new(2);
        yield;
    });

    let a = Cell::new(2);
    assert_send(|| {
        //~^ ERROR: E0277
        drop(&a);
        yield;
    });
}