tests/ui/async-await/issue-64130-1-sync.rs


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#![feature(negative_impls)]
// edition:2018

// This tests the specialized async-await-specific error when futures don't implement an
// auto trait (which is specifically Sync) due to some type that was captured.

struct Foo;

impl !Sync for Foo {}

fn is_sync<T: Sync>(t: T) { }

async fn bar() {
    let x = Foo;
    baz().await;
    drop(x);
}

async fn baz() { }

fn main() {
    is_sync(bar());
    //~^ ERROR future cannot be shared between threads safely
}