src/test/ui/async-await/async-borrowck-escaping-closure-error.rs

// edition:2018
#![feature(async_closure,async_await)]
fn foo() -> Box<dyn std::future::Future<Output = u32>> {
    let x = 0u32;
    Box::new((async || x)())
    //~^ ERROR E0373
}

fn main() {
}