error: future cannot be sent between threads safely --> $DIR/missing-send-bound.rs:14:20 | LL | assert_is_send(test::()); | ^^^^^^^^^^^ future returned by `test` is not `Send` | = help: within `impl Future`, the trait `Send` is not implemented for `impl Future` note: future is not `Send` as it awaits another future which is not `Send` --> $DIR/missing-send-bound.rs:10:5 | LL | T::bar().await; | ^^^^^^^^ await occurs here on type `impl Future`, which is not `Send` note: required by a bound in `assert_is_send` --> $DIR/missing-send-bound.rs:18:27 | LL | fn assert_is_send(_: impl Send) {} | ^^^^ required by this bound in `assert_is_send` error: aborting due to previous error