File: extern-types-not-sync-send.rs

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// Make sure extern types are !Sync and !Send.

#![feature(extern_types)]

extern "C" {
    type A;
}

fn assert_sync<T: ?Sized + Sync>() {}
fn assert_send<T: ?Sized + Send>() {}

fn main() {
    assert_sync::<A>();
    //~^ ERROR `A` cannot be shared between threads safely [E0277]

    assert_send::<A>();
    //~^ ERROR `A` cannot be sent between threads safely [E0277]
}