error: future cannot be sent between threads safely --> $DIR/issue-64130-2-send.rs:21:5 | LL | fn is_send(t: T) { } | ---- required by this bound in `is_send` ... LL | is_send(bar()); | ^^^^^^^ future returned by `bar` is not `Send` | = help: within `impl Future`, the trait `Send` is not implemented for `Foo` note: future is not `Send` as this value is used across an await --> $DIR/issue-64130-2-send.rs:15:5 | LL | let x = Foo; | - has type `Foo` which is not `Send` LL | baz().await; | ^^^^^^^^^^^ await occurs here, with `x` maybe used later LL | } | - `x` is later dropped here error: aborting due to previous error