File: try-in-sync.rs

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rustc 1.85.0%2Bdfsg2-3
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//@ edition: 2021

async fn foo() -> Result<(), ()> { todo!() }

fn main() -> Result<(), ()> {
    foo()?;
    //~^ ERROR the `?` operator can only be applied to values that implement `Try`
    Ok(())
}