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// edition:2018
#![feature(must_not_suspend)]
#![allow(must_not_suspend)]
use std::future::Future;
use std::sync::Mutex;
fn fake_spawn<F: Future + Send + 'static>(f: F) { }
async fn wrong_mutex() {
let m = Mutex::new(1);
{
let mut guard = m.lock().unwrap();
(async { "right"; }).await;
*guard += 1;
}
(async { "wrong"; }).await;
}
fn main() {
fake_spawn(wrong_mutex()); //~ Error future cannot be sent between threads safely
}
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