error: future cannot be sent between threads safely
  --> $DIR/async-fn-nonsend.rs:72:17
   |
LL |     assert_send(non_send_temporary_in_match());
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `non_send_temporary_in_match` 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-fn-nonsend.rs:36:26
   |
LL |     match Some(non_send()) {
   |           ---------------- has type `Option<impl Debug>` which is not `Send`
LL |         Some(_) => fut().await,
   |                          ^^^^^ await occurs here, with `Some(non_send())` maybe used later
note: required by a bound in `assert_send`
  --> $DIR/async-fn-nonsend.rs:67:24
   |
LL | fn assert_send(_: impl Send) {}
   |                        ^^^^ required by this bound in `assert_send`

error: future cannot be sent between threads safely
  --> $DIR/async-fn-nonsend.rs:74:17
   |
LL |     assert_send(non_sync_with_method_call());
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `non_sync_with_method_call` is not `Send`
   |
   = help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `dyn std::fmt::Write`
   = note: consider using `std::sync::Arc<dyn std::fmt::Write>`; for more information visit <https://doc.rust-lang.org/book/ch16-03-shared-state.html>
note: future is not `Send` as this value is used across an await
  --> $DIR/async-fn-nonsend.rs:49:15
   |
LL |     let f: &mut std::fmt::Formatter = &mut get_formatter();
   |                                            --------------- has type `Formatter<'_>` which is not `Send`
...
LL |         fut().await;
   |               ^^^^^ await occurs here, with `get_formatter()` maybe used later
note: required by a bound in `assert_send`
  --> $DIR/async-fn-nonsend.rs:67:24
   |
LL | fn assert_send(_: impl Send) {}
   |                        ^^^^ required by this bound in `assert_send`

error: aborting due to 2 previous errors