rust/src/test/compile-fail/specialization-negative-impl.rs

// Copyright 2015 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(optin_builtin_traits)]
#![feature(specialization)]

struct TestType<T>(T);

// TODO: nail down the rules here with @nikomatsakis

unsafe impl<T> Send for TestType<T> {}
impl !Send for TestType<u8> {}

fn assert_send<T: Send>() {}

fn main() {
    assert_send::<TestType<()>>();
    assert_send::<TestType<u8>>(); //~ ERROR
}