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+error: future cannot be sent between threads safely
+ --> $DIR/issue-68112.rs:34:5
+ |
+LL | require_send(send_fut);
+ | ^^^^^^^^^^^^ future created by async block is not `Send`
+ |
+ = help: the trait `Sync` is not implemented for `RefCell<i32>`
+ = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
+note: future is not `Send` as it awaits another future which is not `Send`
+ --> $DIR/issue-68112.rs:31:17
+ |
+LL | let _ = non_send_fut.await;
+ | ^^^^^^^^^^^^ await occurs here on type `impl Future<Output = Arc<RefCell<i32>>>`, which is not `Send`
+note: required by a bound in `require_send`
+ --> $DIR/issue-68112.rs:11:25
+ |
+LL | fn require_send(_: impl Send) {}
+ | ^^^^ required by this bound in `require_send`
+
+error: future cannot be sent between threads safely
+ --> $DIR/issue-68112.rs:43:5
+ |
+LL | require_send(send_fut);
+ | ^^^^^^^^^^^^ future created by async block is not `Send`
+ |
+ = help: the trait `Sync` is not implemented for `RefCell<i32>`
+ = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
+note: future is not `Send` as it awaits another future which is not `Send`
+ --> $DIR/issue-68112.rs:40:17
+ |
+LL | let _ = make_non_send_future1().await;
+ | ^^^^^^^^^^^^^^^^^^^^^^^ await occurs here on type `impl Future<Output = Arc<RefCell<i32>>>`, which is not `Send`
+note: required by a bound in `require_send`
+ --> $DIR/issue-68112.rs:11:25
+ |
+LL | fn require_send(_: impl Send) {}
+ | ^^^^ required by this bound in `require_send`
+
+error[E0277]: `RefCell<i32>` cannot be shared between threads safely
+ --> $DIR/issue-68112.rs:62:5
+ |
+LL | require_send(send_fut);
+ | ^^^^^^^^^^^^ `RefCell<i32>` cannot be shared between threads safely
+ |
+ = help: the trait `Sync` is not implemented for `RefCell<i32>`
+ = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
+ = note: required for `Arc<RefCell<i32>>` to implement `Send`
+note: required because it's used within this `async fn` body
+ --> $DIR/issue-68112.rs:47:31
+ |
+LL | async fn ready2<T>(t: T) -> T {
+ | _______________________________^
+LL | | t
+LL | | }
+ | |_^
+note: required because it appears within the type `impl Future<Output = Arc<RefCell<i32>>>`
+ --> $DIR/issue-68112.rs:50:31
+ |
+LL | fn make_non_send_future2() -> impl Future<Output = Arc<RefCell<i32>>> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ = note: required because it captures the following types: `impl Future<Output = Arc<RefCell<i32>>>`, `Ready<i32>`
+note: required because it's used within this `async` block
+ --> $DIR/issue-68112.rs:57:20
+ |
+LL | let send_fut = async {
+ | ____________________^
+LL | | let non_send_fut = make_non_send_future2();
+LL | | let _ = non_send_fut.await;
+LL | | ready(0).await;
+LL | | };
+ | |_____^
+note: required by a bound in `require_send`
+ --> $DIR/issue-68112.rs:11:25
+ |
+LL | fn require_send(_: impl Send) {}
+ | ^^^^ required by this bound in `require_send`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0277`.