cannot-infer-async.rs

//@ edition:2018

use std::io::Error;

fn make_unit() -> Result<(), Error> {
    Ok(())
}

fn main() {
    let fut = async {
        make_unit()?;

        Ok(())
        //~^ ERROR type annotations needed
    };
}

// ferrocene-annotations: fls_aadan19t5006
// async Blocks