File: issue-70818.rs

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rustc 1.86.0%2Bdfsg1-1
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//@ edition:2018

use std::future::Future;
fn foo<T: Send, U>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
    //~^ Error future cannot be sent between threads safely
    async { (ty, ty1) }
}

fn main() {}