File: extern-types-manual-sync-send.rs

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rustc 1.87.0%2Bdfsg1-1
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//@ run-pass
// Test that unsafe impl for Sync/Send can be provided for extern types.

#![feature(extern_types)]

extern "C" {
    type A;
}

unsafe impl Sync for A {}
unsafe impl Send for A {}

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

fn main() {
    assert_sync::<A>();
    assert_send::<A>();
}