rust/tests/ui/traits/next-solver/async.rs

// compile-flags: -Znext-solver
// edition: 2021
// revisions: pass fail
//[pass] check-pass

use std::future::Future;

fn needs_async(_: impl Future<Output = i32>) {}

#[cfg(fail)]
fn main() {
    needs_async(async {});
    //[fail]~^ ERROR type mismatch
}

#[cfg(pass)]
fn main() {
    needs_async(async { 1i32 });
}