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error: future cannot be sent between threads safely
--> $DIR/issue-70818.rs:4:38
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LL | fn foo<T: Send, U>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future created by async block is not `Send`
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note: captured value is not `Send`
--> $DIR/issue-70818.rs:6:18
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LL | async { (ty, ty1) }
| ^^^ has type `U` which is not `Send`
help: consider restricting type parameter `U`
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LL | fn foo<T: Send, U: std::marker::Send>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
| +++++++++++++++++++
error: aborting due to 1 previous error
|
