error: future cannot be sent between threads safely --> $DIR/async-await-let-else.rs:48:13 | LL | is_send(foo(Some(true))); | ^^^^^^^^^^^^^^^ future returned by `foo` is not `Send` | = help: within `impl Future`, the trait `Send` is not implemented for `Rc<()>` note: future is not `Send` as this value is used across an await --> $DIR/async-await-let-else.rs:11:14 | LL | let r = Rc::new(()); | - has type `Rc<()>` which is not `Send` LL | bar().await | ^^^^^^ await occurs here, with `r` maybe used later LL | }; | - `r` is later dropped here note: required by a bound in `is_send` --> $DIR/async-await-let-else.rs:19:15 | LL | fn is_send(_: T) {} | ^^^^ required by this bound in `is_send` error: future cannot be sent between threads safely --> $DIR/async-await-let-else.rs:50:13 | LL | is_send(foo2(Some(true))); | ^^^^^^^^^^^^^^^^ future returned by `foo2` is not `Send` | = help: within `impl Future`, the trait `Send` is not implemented for `Rc<()>` note: future is not `Send` as this value is used across an await --> $DIR/async-await-let-else.rs:23:26 | LL | bar2(Rc::new(())).await | ----------- ^^^^^^ await occurs here, with `Rc::new(())` maybe used later | | | has type `Rc<()>` which is not `Send` LL | }; | - `Rc::new(())` is later dropped here note: required by a bound in `is_send` --> $DIR/async-await-let-else.rs:19:15 | LL | fn is_send(_: T) {} | ^^^^ required by this bound in `is_send` error: future cannot be sent between threads safely --> $DIR/async-await-let-else.rs:52:13 | LL | is_send(foo3(Some(true))); | ^^^^^^^^^^^^^^^^ future returned by `foo3` is not `Send` | = help: within `impl Future`, the trait `Send` is not implemented for `Rc<()>` note: future is not `Send` as this value is used across an await --> $DIR/async-await-let-else.rs:33:28 | LL | (Rc::new(()), bar().await); | ----------- ^^^^^^ - `Rc::new(())` is later dropped here | | | | | await occurs here, with `Rc::new(())` maybe used later | has type `Rc<()>` which is not `Send` note: required by a bound in `is_send` --> $DIR/async-await-let-else.rs:19:15 | LL | fn is_send(_: T) {} | ^^^^ required by this bound in `is_send` error: future cannot be sent between threads safely --> $DIR/async-await-let-else.rs:54:13 | LL | is_send(foo4(Some(true))); | ^^^^^^^^^^^^^^^^ future returned by `foo4` is not `Send` | = help: within `impl Future`, the trait `Send` is not implemented for `Rc<()>` note: future is not `Send` as this value is used across an await --> $DIR/async-await-let-else.rs:41:14 | LL | let r = Rc::new(()); | - has type `Rc<()>` which is not `Send` LL | bar().await; | ^^^^^^ await occurs here, with `r` maybe used later ... LL | }; | - `r` is later dropped here note: required by a bound in `is_send` --> $DIR/async-await-let-else.rs:19:15 | LL | fn is_send(_: T) {} | ^^^^ required by this bound in `is_send` error: aborting due to 4 previous errors