error: future cannot be sent between threads safely
  --> $DIR/async-fn-nonsend.rs:49:5
   |
LL | fn assert_send(_: impl Send) {}
   |                        ---- required by this bound in `assert_send`
...
LL |     assert_send(local_dropped_before_await());
   |     ^^^^^^^^^^^ future returned by `local_dropped_before_await` is not `Send`
   |
   = help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<()>`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-fn-nonsend.rs:24:5
   |
LL |     let x = non_send();
   |         - has type `impl std::fmt::Debug` which is not `Send`
LL |     drop(x);
LL |     fut().await;
   |     ^^^^^^^^^^^ await occurs here, with `x` maybe used later
LL | }
   | - `x` is later dropped here

error: future cannot be sent between threads safely
  --> $DIR/async-fn-nonsend.rs:51:5
   |
LL | fn assert_send(_: impl Send) {}
   |                        ---- required by this bound in `assert_send`
...
LL |     assert_send(non_send_temporary_in_match());
   |     ^^^^^^^^^^^ future returned by `non_send_temporary_in_match` is not `Send`
   |
   = help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<()>`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-fn-nonsend.rs:33:20
   |
LL |     match Some(non_send()) {
   |                ---------- has type `impl std::fmt::Debug` which is not `Send`
LL |         Some(_) => fut().await,
   |                    ^^^^^^^^^^^ await occurs here, with `non_send()` maybe used later
...
LL | }
   | - `non_send()` is later dropped here

error: future cannot be sent between threads safely
  --> $DIR/async-fn-nonsend.rs:53:5
   |
LL | fn assert_send(_: impl Send) {}
   |                        ---- required by this bound in `assert_send`
...
LL |     assert_send(non_sync_with_method_call());
   |     ^^^^^^^^^^^ future returned by `non_sync_with_method_call` is not `Send`
   |
   = help: the trait `std::marker::Send` is not implemented for `dyn std::fmt::Write`
note: future is not `Send` as this value is used across an await
  --> $DIR/async-fn-nonsend.rs:42:9
   |
LL |     let f: &mut std::fmt::Formatter = panic!();
   |         - has type `&mut std::fmt::Formatter<'_>` which is not `Send`
LL |     if non_sync().fmt(f).unwrap() == () {
LL |         fut().await;
   |         ^^^^^^^^^^^ await occurs here, with `f` maybe used later
LL |     }
LL | }
   | - `f` is later dropped here

error: aborting due to 3 previous errors