error: future cannot be sent between threads safely --> $DIR/issue-64130-2-send.rs:24:13 | LL | is_send(bar()); | ^^^^^ future returned by `bar` is not `Send` | = note: the trait bound `Unique: Send` is not satisfied note: future is not `Send` as this value is used across an await --> $DIR/issue-64130-2-send.rs:18:11 | LL | let x = Box::new(Foo); | - has type `Box` which is not `Send` LL | baz().await; | ^^^^^ await occurs here, with `x` maybe used later note: required by a bound in `is_send` --> $DIR/issue-64130-2-send.rs:14:15 | LL | fn is_send(t: T) { } | ^^^^ required by this bound in `is_send` help: consider borrowing here | LL | is_send(&bar()); | + error: aborting due to previous error