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<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
   = note: use `std::sync::Arc` instead of `std::rc::Rc`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-await-let-else.rs:11:15
   |
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: 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<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
   = note: use `std::sync::Arc` instead of `std::rc::Rc`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-await-let-else.rs:23:27
   |
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: 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<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
   = note: use `std::sync::Arc` instead of `std::rc::Rc`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-await-let-else.rs:33:29
   |
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: 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<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
   = note: use `std::sync::Arc` instead of `std::rc::Rc`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-await-let-else.rs:41:15
   |
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: Send>(_: T) {}
   |               ^^^^ required by this bound in `is_send`

error: aborting due to 4 previous errors