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// revisions: no_drop_tracking drop_tracking drop_tracking_mir
// [drop_tracking] compile-flags: -Zdrop-tracking
// [drop_tracking_mir] compile-flags: -Zdrop-tracking-mir
// 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() {}
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